Sensory Perception: Visual Cues

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Questions and Answers

Which visual cue relies on the eyes being approximately 2.5 inches apart?

  • Retinal disparity (correct)
  • Motion parallax
  • Convergence
  • Relative height

When viewing objects far away, which of the following eye muscle states is most likely?

  • Eyes converge
  • Eyes contract
  • Eyes are relaxed (correct)
  • Eyes diverge

Which of the following sensory experiences does NOT typically undergo sensory adaptation?

  • Sight in response to bright light
  • Pain from a persistent injury (correct)
  • Smell of a strong perfume
  • Hearing due to loud noise

According to Weber's Law, if the just noticeable difference for a 10 lb weight is 1 lb, what is the just noticeable difference for a 20 lb weight?

<p>2 lb (D)</p> Signup and view all the answers

According to signal detection theory, what term refers to a case where a signal is present, and the participant correctly identifies it?

<p>Hit (B)</p> Signup and view all the answers

A participant consistently reports detecting a signal, even when no signal is present. According to signal detection theory, what type of strategy is this participant employing?

<p>Liberal (A)</p> Signup and view all the answers

Which of the following describes the role of prior knowledge in perception?

<p>Top-down processing (A)</p> Signup and view all the answers

Which Gestalt principle explains why we see a series of dots arranged in a line as a single unit?

<p>Continuity (C)</p> Signup and view all the answers

What is the function of the lens in the eye?

<p>To bend light and focus it on the retina (C)</p> Signup and view all the answers

What is the role of the retinal ganglion cells?

<p>Send signals to the optic nerve (B)</p> Signup and view all the answers

In the phototransduction cascade, what molecule causes the closing of Na+ channels in rods?

<p>Phosphodiesterase (B)</p> Signup and view all the answers

Why do cones detect color while rods detect light?

<p>Cones contain three different types of photopsin (A)</p> Signup and view all the answers

Which area of the retina has the highest visual acuity?

<p>Fovea (A)</p> Signup and view all the answers

What is the role of the organ of Corti in auditory transduction?

<p>To convert pressure waves into neural signals (C)</p> Signup and view all the answers

What structures are located in the inner ear?

<p>Cochlea and semicircular canals (D)</p> Signup and view all the answers

How can the brain distinguish different frequencies of sound?

<p>By the location of activated hair cells along the cochlea (C)</p> Signup and view all the answers

What is the primary purpose of a cochlear implant?

<p>Convert sound to electrical signals (B)</p> Signup and view all the answers

What type of somatosensory receptor is responsible for detecting texture?

<p>Mechanoreceptor (D)</p> Signup and view all the answers

What is the difference between kinaesthesia and proprioception?

<p>Kinaesthesia is behavioural, while proprioception is cognitive (C)</p> Signup and view all the answers

What does increased myelination do to action potential conductance?

<p>Speeds it up (D)</p> Signup and view all the answers

What role does the orbitofrontal cortex play in smell?

<p>Odorant pleasantness (B)</p> Signup and view all the answers

What structure separates the olfactory epithelium from the brain?

<p>Cribriform plate (B)</p> Signup and view all the answers

What type of senses can cause a G-protein mediated reaction?

<p>Taste (B)</p> Signup and view all the answers

Which of the following is NOT a stage of sleep?

<p>Alpha (D)</p> Signup and view all the answers

What type of activity is reduced during REM sleep, which results logic seeming abnormal?

<p>Prefrontal cortex (D)</p> Signup and view all the answers

What is a potential benefit of meditation?

<p>Increased theta wave activity (D)</p> Signup and view all the answers

Which of the following drugs increases GABA activity?

<p>Benzodiazepines (C)</p> Signup and view all the answers

Amphetamines affect levels of what neurotransmitter?

<p>Dopamine (D)</p> Signup and view all the answers

What causes the body to lower its heartrate in response to taking amphetamines?

<p>Homeostasis maintenance (C)</p> Signup and view all the answers

Which route of drug entry creates more addictive potential?

<p>Inhalation (B)</p> Signup and view all the answers

What area of the brain releases dopamine when rewards are obtained?

<p>Ventral tegmental area (D)</p> Signup and view all the answers

In treating drug dependence, what is the function of methadone?

<p>Reduces cravings and dampens the high (C)</p> Signup and view all the answers

What happens to attention if attempting to do more than one thing at a time?

<p>Switching occurs repeatedly (D)</p> Signup and view all the answers

In Broadbent's Early Selection Theory, at what stage is the meaning of words assigned?

<p>Perceptual process (A)</p> Signup and view all the answers

According to the spotlight model of attention, what allows you to notice your own name when primed.

<p>Unconscious level (B)</p> Signup and view all the answers

What is the method of loci and how does it improve memory?

<p>Associating items with a familiar place (A)</p> Signup and view all the answers

What is one of the reasons for forgetting and how can we overcome this.

<p>Decay happens if we don't encode things well; relearning (C)</p> Signup and view all the answers

What is long-term potentiation?

<p>Connections between neurons strengthen (D)</p> Signup and view all the answers

In Piaget's stages of cognitive development, what does it mean to not understand object permanence.

<p>An object will disappear when turning away or hiding it (D)</p> Signup and view all the answers

What is the Wernicke's area is damaged during communication?

<p>Words they make don't make any sense (D)</p> Signup and view all the answers

What is responsible for a person's fight or flight responses?

<p>Hypothalamus (B)</p> Signup and view all the answers

After learning about a friend diagnosed with a mental disorder, a personal might feel pity because of what type of cause?

<p>Internal thinking (C)</p> Signup and view all the answers

What type of visual cue is convergence?

<p>Binocular cue that relies on eye muscle contraction (D)</p> Signup and view all the answers

If an object appears to overlap another, what monocular cue could you use to understand that the object in front is closer?

<p>Interposition (C)</p> Signup and view all the answers

Which of the following is an example of sensory adaptation?

<p>No longer noticing the feeling of your watch on your wrist after a few minutes. (D)</p> Signup and view all the answers

What does Weber's Law suggest about the relationship between the intensity of a stimulus and its just noticeable difference (JND)?

<p>The JND is a linear function of the stimulus intensity. (C)</p> Signup and view all the answers

If a person can detect a stimulus 60% of the time, how would this level be classified?

<p>Superliminal stimulus (D)</p> Signup and view all the answers

During linear acceleration, what structures are responsible for detecting movement?

<p>Otolithic organs (C)</p> Signup and view all the answers

What sensation occurs as a result of endolymph continuing to move in the semicircular canals even when we are no longer spinning?

<p>Dizziness (C)</p> Signup and view all the answers

According to Signal Detection Theory, a 'liberal' strategy in decision-making is most likely to:

<p>Increase the number of hits, but also false alarms. (A)</p> Signup and view all the answers

How is the strength of a signal (d') determined in signal detection theory?

<p>By the intensity of the signal relative to the noise. (B)</p> Signup and view all the answers

What type of processing is exemplified when prior knowledge shapes perception, influencing how we interpret incoming sensory information?

<p>Top-down processing (D)</p> Signup and view all the answers

How would something like olympic rings be processed?

<p>Pragnanz (A)</p> Signup and view all the answers

What aspect of the eye is a transparent thick sheet of tissue?

<p>Cornea (C)</p> Signup and view all the answers

Which structure of the eye is responsible for determining eye color?

<p>Iris (A)</p> Signup and view all the answers

What part of the eye provides jelly-like substance to provide pressure to the eyeball?

<p>Vitreous chamber (D)</p> Signup and view all the answers

In the retina, what structures are completely covered in cones, and have no rods?

<p>Fovea (B)</p> Signup and view all the answers

What two types of cells connect when a rod is turned off by light?

<p>Bipolar and ganglion (B)</p> Signup and view all the answers

What two molecules need to bind so that a Na+ channel can open and allow Na+ ions to come into the cell?

<p>cGMP and GMP (D)</p> Signup and view all the answers

How do rods and cones differ considering their sensitivity and ability to detect color?

<p>Rods are more sensitive to light and detect black and white; cones are less sensitive and detect color. (C)</p> Signup and view all the answers

A person who has no axons in the way of light would have light hitting what part of their eye?

<p>Fovea (A)</p> Signup and view all the answers

Why should you break up frequency for sound?

<p>Sounds travel different lengths along the cochlea. (C)</p> Signup and view all the answers

What are the three bones that vibrate in response to sound waves called?

<p>Malleus, incus, stapes (B)</p> Signup and view all the answers

What structure pushes fluid around the cochlea, and is attached to the stapes?

<p>Oval window (B)</p> Signup and view all the answers

What structure contains the basilar and tectorial membranes?

<p>Organ of Corti (B)</p> Signup and view all the answers

How can signals be sent to the auditory nerve?

<p>Ca cells get activated when K is inside (D)</p> Signup and view all the answers

What part of the basilar membrane is activated by sounds of varying frequencies?

<p>Both apex and base (C)</p> Signup and view all the answers

A device that converts electrical impulses into neural impulses will send a signal to what part of the brain?

<p>Primary auditory cortex (B)</p> Signup and view all the answers

Which of the following sensations does not include temperature, pressure, pain and position, but helps with cognitive awareness of body in space?

<p>Proprioception (A)</p> Signup and view all the answers

What receptor relies on heat in order for you to sense changes in temperature?

<p>TrypV1 receptor (A)</p> Signup and view all the answers

Touching a hot stove would recruit what type of fiber first?

<p>A-delta fibers (D)</p> Signup and view all the answers

What separates the olfactory epithelium from the brain?

<p>Cribriform plate (D)</p> Signup and view all the answers

A person with damage to their amygdala wouldn't be able to activate what system?

<p>Vomeronasal system (C)</p> Signup and view all the answers

Salty and sour tastes rely on what?

<p>Ion channels (D)</p> Signup and view all the answers

What occurs during sleep spindles?

<p>Certain perceptions are inhibited (C)</p> Signup and view all the answers

Which stage of sleep causes most other muscles to be paralyzed?

<p>REM (D)</p> Signup and view all the answers

What combination of waves is seen during REM sleep that is similar to being awake?

<p>Alpha, beta, and desynchronous waves (A)</p> Signup and view all the answers

What hormone is produced in the pineal gland, and controls circadian rhythm?

<p>Melatonin (C)</p> Signup and view all the answers

According to Sigmund Freud, what is the actual storyline of a dream called?

<p>Manifest content (D)</p> Signup and view all the answers

Sleep deprivation causes the body to produce more cortisol and the hunger hormone, what is the specific outcome?

<p>Obesity (A)</p> Signup and view all the answers

What is the difference between central and obstructive sleep apnea?

<p>Central sleep apnea is due to problems with the brain (B)</p> Signup and view all the answers

What is the goal of meditation?

<p>Increased attention control (A)</p> Signup and view all the answers

Compared to normal light relaxation, what activity is shown from more alpha brainwaves?

<p>Meditation (A)</p> Signup and view all the answers

Which of the following functions is NOT lowered by depressants?

<p>Motor skills (D)</p> Signup and view all the answers

What is the result of homeostasis if someone were to take amphetamines?

<p>The body will try to find ways to slow the heart rate (B)</p> Signup and view all the answers

If an individual can detect a stimulus 55% of the time, but requires a stronger stimulus to detect a change in intensity, this indicates what about their absolute and difference thresholds?

<p>Low absolute threshold, high difference threshold. (C)</p> Signup and view all the answers

According to Weber's Law, if the Just Noticeable Difference (JND) for a stimulus of intensity X is Y, what change would cause the JND to double?

<p>Increasing the original stimulus intensity to 2X. (B)</p> Signup and view all the answers

If a person can detect a weak signal more frequently when they are expecting it, but also reports more false alarms, which aspect of signal detection theory is being demonstrated?

<p>A shift in the participant's strategy C. (C)</p> Signup and view all the answers

Which of the following accurately describes the relationship between monocular cues and binocular cues in depth perception?

<p>Binocular cues are more effective at shorter distances, while monocular cues are effective at both close and far distances. (C)</p> Signup and view all the answers

How are the structures in the semicircular canals and otolithic organs used together in balance and spatial orientation?

<p>Semicircular canals detect what direction our head is moving in, while otolithic organs detect linear acceleration. (B)</p> Signup and view all the answers

After a stroke, a patient has difficulty understanding speech but can still produce fluent, nonsensical speech. This indicates damage to which brain area and affects what bundle of nerves?

<p>Wernicke's area; arcuate fasciculus. (C)</p> Signup and view all the answers

What explains the observation that someone who is skilled at a task is sometimes unable to complete it if being observed?

<p>The Yerkes-Dodson Law, indicating performance may decrease with overly high arousal. (B)</p> Signup and view all the answers

How does cognitive behavioral therapy (CBT) and motivational interviewing address addiction?

<p>CBT focuses on identifying triggers and developing coping mechanisms, while motivational interviewing focuses on increasing a patient's intrinsic desire to change. (D)</p> Signup and view all the answers

According to the Elaboration Likelihood Model, what factor leads somebody to deep process a message?

<p>The individual has a personal isssue in it. (D)</p> Signup and view all the answers

When examining a patient, what would indicate someone's cognitive dissonance?

<p>Thoughts, actions, and words are out of alignment. (C)</p> Signup and view all the answers

Flashcards

Visual Cues Categories

Depth, Form, Motion, Constancy

Retinal Disparity

Eyes 2.5 inches apart provide two slightly different retinal images.

Convergence

Eyes relax for distant objects, contract for close objects.

Monocular Cues

Relative size, interposition, shading, motion parallax, height

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Constancy

Size, shape, and color perception remain constant despite retinal changes.

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Hearing Adaptation

Inner ear muscle contracts to dampen loud sounds.

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Touch Adaptation

Reduced sensitivity of temperature receptors with constant exposure.

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Smell Adaptation

Desensitization to consistent molecular presence.

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Proprioception Adaptation

Brain accounts for body's orientation in space.

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Sight Adaptation

Pupils dilate/constrict; rods/cones adjust light sensitivity.

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Weber's Law

Delta I / I = k

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Absolute Threshold

Minimum stimulus intensity to detect a signal 50% of the time.

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Influences on Absolute Threshold

Factors like expectations, experience, motivation, and alertness.

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Subliminal Stimuli

Subtle stimuli below the absolute detection point.

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Semicircular Canals

Posterior, lateral, and anterior detect rotational movement.

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Otolithic Organs

Utricle and saccule detect linear acceleration; crystals pull on hair cells.

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Signal Detection Theory

Making decisions under uncertainty.

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Signal Strength (d')

Hit > miss (strong signal); miss < hit (weak signal)

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Strategy (c) in SDT

Conservative (always say no); liberal (always say yes).

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Bottom-up Processing

Stimulus-driven perception; building from parts.

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Top-down Processing

Cognition-driven perception; using prior knowledge.

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Gestalt Principles

Similarity, Pragnanz, Proximity, Continuity, Closure

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Similarity

Items grouped together

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Pragnanz

reality is often organized reduced to simplest form possible

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Proximity

Objects close are grouped

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Continuity

Lines seen smoothest path

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Closure

Objects grouped together are seen as a whole

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Eye Structure Layers

Conjunctiva, cornea, anterior chamber, pupil, lens, etc.

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Conjunctiva

First layer light hits

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Cornea

Transparent sheet, anterior 1/6th

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Anterior Chamber

Space, aqueous humour, maintains shape

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Pupil

Hole made by iris, determines eye color

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Lens

Bends light to back of eye

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Suspensory Ligaments

Ligaments attach to muscle, forms ciliary body, secretes aqueous humor

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Posterior Chamber

Area behind muscle, filled with aqueous humor

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Vitreous Chamber

Filled with vitreous humour

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Macula

Special part of filled photoreceptors, with retina rich in cones

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Fovea

no rods and completely retina covered in cones

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Choroid

Black in humans, a

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Sclera

Posterior 5/6th of whites of the eye

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Sensation

light -> neural impulse, by a photoreceptor

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Light

part of electromagnetic wave

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Light Steps

Enters pupil, hits retina (rods and cones)

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Rods

120 million, night vision

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Rods

Phototransduction

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Cones

6-7 million, red/green/blue

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Fovea

high resolution

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Phototransduction

When light hits retina, cascade

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Transducin

break from rhodopsin

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Phosphodiesterase

cGMP to GMP, closes Na+

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Rods

Hyperpolarize; no glutamate released

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Cones

repsonsive to color (60% red, 30% green, 10% blue)

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Blind Spot

where optic nerve connects to retina

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Feature Detection

color (trichromatic theory), form (parvocellular), motion (magnocellular)

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Parallel Processing

simultaneous, differing signals

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Audition Needs

pressurized sound, hair cells

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Sound wave

high and low density air molecules

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Outer Ear

pinna, meatus, tympanic membrane

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Middle Ear

malleus, incus, stapes

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Inner Ear

cochlea, semicircular canals

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Stapes

From frequency of stimulus

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Organ of Corti structure

upper/lower membrane, hair cells

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Hair Bundle

filaments that connect Kinocilium

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Tip Links

gate of channel lets potassium flow

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Potassium Influx

activates spiral ganglion, auditory nerve

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Brain

relies on cochlea differences

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Basilar Tuning

apex for low, base for high

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Cochlear Implant

electrode in cochlea to stimulate it

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Somatosensation

intensity, location, timing, type

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Adaptation

receptor to change

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Adaptation Important

overexcited, and cell can die so fast

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Amplification

light causes receptors to fire AP

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Homunculus

topological body map in cortex

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Proprioception

cognitive version of position

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Kinesthesia

behavioural sense of movement

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3 types of fibres

fast, medium, slow fibres

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Smell's Role in Taste

can't taste when has cold

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Smell

known as olfaction, through olfactory pathway

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Olfactory

bulbs sensitive

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Pheromones

sense by other animals, released in urine

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Gustation

bitter, sour, salty, sweet, umami, localized

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Receptor Axon

gustatory cortex

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range from

external factors

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Hypnagonic Hallucinations

Tetris hallucinations

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N1

Dominated by theta

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Sleep Spindles

maintain tranquil state

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K-Complexes

suppress cortical

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Rapid Eye

REM

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Hhythms

what you get in afternoon

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REM

activity in cortex is decreased to logic,

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Freud

unconscious, little

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Evolutionary

threat to

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flexibility to

helps brain

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Freud

what happens and, is its

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the of Synthestis Hypothesis

Impulses, brainstem interpreted by which is the frontal ,

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people can deprivation,

and more

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obesity

more cortisol, make food for body

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can antidepressants process REM

take , for and ,

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Ttrack

more sleep how is much get for

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sleeplessness sleep

unwillingness, problems, on for from

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Narcolepsy help

cant stop falls asleep at any always

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Transmitter its to is

linked or, alertnes

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Apnea 1

Stop stop realize and that

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N3

enough gets don to wave don't

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talking/sleep

speaking or

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ariselated Problems,

from or chest wall of

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that obstruct with to and,

to with to

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Study Notes

Sensory Perception: Processing the Environment

  • Sensory perception involves translating environmental information into useful signals
  • Visual cues provide information about depth, form, motion, and constancy

Visual Cues

  • Divided into binocular and monocular categories

Binocular Cues

  • Involve both eyes
  • Retinal disparity occurs because eyes are 2.5 inches apart
  • Convergence involves relaxed eye muscles for distant objects and contracted eye muscles for close ones

Monocular Cues

  • Require only one eye
  • Relative size is deducing size with one eye and interposition (overlap) involves assuming an overlapped object is behind
  • Relative height says things higher are farther away and involves shading and contour to perceive form
  • Motion parallax says things farther away move slower
  • Constancy is the perception of objects as unchanging, even if retinal images differ, includes size, shape and color constancy

Sensory Adaptation

  • Occurs when sensory receptors become less sensitive to constant stimuli
  • Hearing adapts the inner ear muscle when there is a higher noise
  • Touch temperature receptors will become desensitized, as well as smell receptors to molecules
  • Proprioception allows mice raised upside down to accommodate and flip over
  • Sight adapts by down regulating light, constricting the pupils and desensitizing rods and cones to light, and by upregulating dark through pupil dilation

Weber's Law and Just Noticeable Difference (JND)

  • Refers to the smallest change in the intensity of a stimulus that a person can detect, also known as the just noticeable difference (JND)
  • A 2 vs. 2.05 lb weight feels the same, but a 2 vs. 2.2 lb weight difference becomes noticeable
  • Taking a 5 lb weight, might not notice 5.2 lb, but 5.5 lb is noticeable
  • I is the intensity of the stimulus and delta I is the JND
  • The Weber's Law Equation delta I/I = k can predict a linear relationship between incremental threshold and background intensity, with delta I equaling Ik

Absolute Threshold of Sensation

  • The minimum stimulus intensity needed to detect a particular stimulus is the absolute threshold
  • Stimuli is detected 50% of the time, and differences exist between individuals
  • The JND and the difference threshold isn't the same, as JND is the smallest difference that can be detected 50% of the time
  • Influenced by many factors and psychological states, expectations, experience, motivation and alertness
  • Subliminal stimuli is that below the absolute threshold

The Vestibular System: Balance and Spatial Orientation

  • Focus on the inner ear, mainly the semicircular canals that filled with endolymph that shifts
  • Shift of the endolymph helps detect the direction and strength of head movements
  • Otolithic organs including the utricle and saccule, detect linear acceleration and head position using calcium crystals attached to hair cells
  • Crystal shifts in viscous gel pull on hair cells to trigger AP
  • Vertigo and dizziness can be related
  • Endolymph doesn't stop spinning when movement stops so tricks the brain and creates the feeling of dizziness

Signal Detection Theory:Decision-Making Under Uncertainty

  • Signal detection identifies discerning between important stimuli and unimportant noise
  • Origins in sonar like a small fish versus large whale
  • Role in psychology uses a traffic light example
  • Hit describes when a signal is present and one says yes, miss describes when a signal is present and one says no
  • False alarm describes when a signal is absent and one says yes, correct rejection describes when a signal is absent and one says no
  • Variables in the theory entail signal strength, d', and strategy, c
  • Strength can define hit and miss rates with a strong signal more likely to be a hit
  • 2 strategies for processing include conservative, always say no unless 100% sure, or liberal, always say yes
  • For any signal, have noise distribution and signal distribution graphs
  • The difference between noise distribution and signal distribution means are used to detect the strength level
  • The X-axis represents intensity
  • The strategy C can be expressed via choice of what threshold to deem as necessary to say Y vs N. Examples include Beta, D, C
  • C strategy is an ideal observer optimizing both miss and false alarm rates
  • Beta, set value of threshold to the ratio of height of signal distribution to noise distributions

Visual Processing: Bottom-Up vs. Top-Down

  • Bottom-up processing occurs when a stimulus drives perception
  • Sensory information is processed as it enters.
  • Top-Down occurs when background knowledge influences perception
  • Cognition applies what is known and to expect and fill in blanks.

Gestalt Principles

  • Attempt to explain how we perceive things
  • Similarity suggests that items similar to one another are grouped together.
  • Pragnanz suggests that reality is often organized or reduced to simplest form.
  • Proximity says that objects that are close are grouped together.
  • Continuity suggests that lines are seen as following smoothest path.
  • Closure suggests that objects grouped together are seen as a whole.

Structure of the Eye: Sight (Vision)

  • Conjunctiva is the first layer that light hits.
  • Cornea is transparent thick tissue sheet anterior 1/6th.
  • Anterior chamber has aqueous humour to maintain eyeball shape.
  • Pupil is hole made by iris.
  • Lens bends light to the back of the eyeball.
  • Suspensory ligaments attach to a ciliary muscle which combines to create the ciliary Body.
  • Body secrets the aqueous humor.
  • Posterior chamber sits behind the ciliary muscle and contains aqueous humor.
  • Vitreous chamber has vitreous humour, a jelly-like substance that provides pressure to the eyeball.
  • Retina is filled with photoreceptors , macula and fovea which are special parts that are rich in cones.
  • Choroid with pigmented black cells in humans has a network of blood vessels
  • Sclera with whites in the eye are fibrous tissue which covers posterior 5/6th of the eyeball
  • Sclera is also an attachment point for muscles.

Visual Sensory Information

  • Neural impulses can be obtained from light by a photoreceptor
  • Light is an electromagnetic wave in a large spectrum between 400nm (violet) and 700nm (red)
  • Sun is a source of light
  • Light enters the pupil through the rods and cones on the retina
  • 120 million rods exist for night vision
  • Light hits rod that turns off, activating a bipolar cell
  • Then the bipolar cell activates a retinal ganglion cell to the optic nerve and into the brain
  • 6-7 million cones with three types including red, green, and blue, focused in the fovea

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