Sensation, Perception, and Neuroscience
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Questions and Answers

In the context of sensory perception, how does Weber's Law explain the ability to detect changes in stimulus intensity?

  • It suggests that the just noticeable difference is a fixed value, regardless of the original stimulus intensity.
  • It proposes that the just noticeable difference is directly proportional to the logarithm of the original stimulus intensity.
  • It demonstrates that the just noticeable difference decreases exponentially as the original stimulus intensity increases.
  • It indicates that the just noticeable difference is a constant proportion of the original stimulus intensity. (correct)

If a person has difficulty distinguishing between shades of red and green, but has normal blue-yellow vision, which theory of color vision is most relevant to this condition?

  • Trichromatic theory, as it posits that color perception is based on three types of cones sensitive to red, green, and blue.
  • Opponent-process theory, as it suggests that color perception is based on opposing pairs like red-green and blue-yellow. (correct)
  • Dual-process theory, combining both frequency and place theories to explain complex color perception.
  • Retinex theory, as it explains the brain's ability to perceive color constancy under different lighting conditions.

A sound wave with a high frequency is presented to a subject. According to pitch perception theories, how would the subject perceive this sound?

  • As a low pitch, because higher frequencies stimulate the base of the cochlea according to place theory.
  • As a high pitch, because the basilar membrane vibrates more rapidly according to frequency theory.
  • As a low pitch, because the entire basilar membrane vibrates uniformly according to frequency theory.
  • As a high pitch, because different locations on the cochlea are activated depending on the frequency according to place theory. (correct)

If a neuron's myelin sheath is damaged, what is the most likely consequence for neural communication?

<p>Slower transmission of action potentials along the axon. (C)</p> Signup and view all the answers

A new drug selectively enhances the activity of GABA in the brain. What is the most likely behavioral effect of this drug?

<p>Reduced anxiety and increased relaxation. (C)</p> Signup and view all the answers

A patient has suffered damage to their hippocampus. Which of the following cognitive deficits is the patient most likely to exhibit?

<p>Difficulty forming new long-term memories. (A)</p> Signup and view all the answers

Someone is startled by a loud noise. Which brain structure is most directly involved in the immediate emotional response of fear?

<p>The amygdala, which processes emotions like fear and pleasure. (B)</p> Signup and view all the answers

Damage to the frontal lobe is most likely to result in impairments in which of the following cognitive functions?

<p>Planning and decision-making. (B)</p> Signup and view all the answers

If damage occurs to the parietal lobe, which impairment is most likely to occur?

<p>Impaired processing of tactile sensations and spatial orientation (D)</p> Signup and view all the answers

A patient presents with an inability to form new long-term memories, although their short-term memory remains intact. Which brain structure is most likely affected?

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

Following a traumatic brain injury, a patient exhibits significant changes in personality, particularly increased impulsivity and difficulty planning and executing tasks. Which area has likely sustained damage?

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

A researcher is studying the effects of a new drug on neurotransmitter activity in the brain. If the drug increases the reuptake of serotonin, what is the likely outcome?

<p>Decreased serotonin levels in the synaptic cleft. (B)</p> Signup and view all the answers

A patient reports difficulty in producing speech, despite understanding language perfectly well. Which area of the brain is likely to be affected?

<p>Broca's area (A)</p> Signup and view all the answers

If a person has difficulty maintaining balance and coordinating movements, which part of their brain is most likely not functioning correctly?

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

What would be the most likely result of damage to the medulla oblongata?

<p>Disruption of basic life functions such as breathing (D)</p> Signup and view all the answers

A person is exposed to a dangerous situation. Which neurotransmitter is primarily responsible for the immediate 'fight or flight' response?

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

In the context of neural communication, what is the primary function of the myelin sheath?

<p>To insulate axons and increase the speed of neural impulses (B)</p> Signup and view all the answers

If a pharmaceutical company aims to develop a medication that enhances sensory perception, which brain structure should the drug primarily target?

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

A patient exhibits impaired motor control and balance following a stroke. Which brain structure is MOST likely affected?

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

A researcher is investigating the effects of a new drug on memory formation. Which brain area should they MOST closely monitor for changes in activity?

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

Following a traumatic brain injury, a patient struggles with emotional regulation and exhibits increased aggression. Which area of the brain is MOST likely compromised?

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

A researcher discovers a novel compound that selectively enhances the reuptake of a specific neurotransmitter. If administered, which neurotransmitter system would be MOST directly affected?

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

A patient reports a selective loss of the ability to recognize faces, but can still identify other objects. Which area of the brain is MOST likely damaged?

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

A drug is developed that selectively blocks the release of acetylcholine at the neuromuscular junction. What effect would this drug MOST likely have?

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

A patient has difficulty understanding spoken language, although they can still speak fluently, albeit nonsensically. Which brain area is MOST likely affected?

<p>Wernicke's area (D)</p> Signup and view all the answers

A person is participating in a sleep study. If researchers observe a decrease in activity in the reticular formation, what would MOST likely be the corresponding change in the person's state?

<p>Transition to deeper sleep stages (C)</p> Signup and view all the answers

A researcher aims to study the impact of chronic stress on the brain. Which hormone, regulated by the hypothalamus, should they measure to assess the physiological stress response?

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

A cognitive neuroscientist is investigating the neural correlates of decision-making. Which area of the frontal lobe would be of MOST interest in this study?

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

A patient exhibits significant deficits after damage to their parietal lobe while retaining other cognitive functions. Which impairment would be MOST expected?

<p>Difficulty with spatial reasoning (C)</p> Signup and view all the answers

A group of researchers are studying the effects of deep brain stimulation (DBS) on patients with Parkinson's disease. Which brain structure is MOST likely targeted by DBS in these patients?

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

A pharmaceutical company is developing a drug to treat anxiety disorders that directly modulates neurotransmitter activity. Which neurotransmitter system is MOST likely targeted by this drug?

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

After a stroke, a patient has difficulty producing speech, although they can still understand language. Which area of the brain is MOST likely affected?

<p>Broca's area (D)</p> Signup and view all the answers

A neurologist is assessing a patient with suspected damage to the medulla oblongata. What vital function would be of GREATEST concern in this evaluation?

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

How would damage to the temporal lobe most profoundly affect an individual?

<p>Deficits in language comprehension and long-term memory formation. (A)</p> Signup and view all the answers

If a person suffered a stroke that selectively damaged their occipital lobe, which deficit would they most likely experience?

<p>Impairment in processing visual information, potentially including blindness or visual agnosia. (A)</p> Signup and view all the answers

An individual reports they can see but cannot recognize objects. Which area of the brain has most likely been affected?

<p>Visual association areas in the occipital lobe. (D)</p> Signup and view all the answers

Which scenario best illustrates the concept of Weber's Law in sensation and perception?

<p>Detecting a 1 lb increase in a 10 lb weight, but not detecting the same increase in a 100 lb weight. (C)</p> Signup and view all the answers

What would be the most significant consequence of damage to the hair cells within the cochlea?

<p>Significant hearing impairment or deafness. (A)</p> Signup and view all the answers

If a pharmaceutical company developed a drug that selectively blocked the reuptake of serotonin, which of the following effects would be expected?

<p>Elevated mood and potentially reduced symptoms of depression. (B)</p> Signup and view all the answers

Damage to Broca's area is most likely to result in which specific impairment?

<p>Impairment in the production of speech. (C)</p> Signup and view all the answers

A patient exhibits an inability to feel pain or temperature on their left side, but their motor functions remain intact. Where is the most probable location of the brain lesion?

<p>Right parietal lobe. (C)</p> Signup and view all the answers

Which of the following best describes the function of the myelin sheath that surrounds certain neuronal axons?

<p>It increases the speed of electrical signal transmission. (A)</p> Signup and view all the answers

What is the most likely consequence of damage to the fovea?

<p>Reduced visual acuity and difficulty seeing fine details. (A)</p> Signup and view all the answers

How does transduction occur in the visual system?

<p>Photoreceptors convert light energy into electrical signals. (A)</p> Signup and view all the answers

A person who has difficulty understanding the emotional content of speech most likely has damage to which area?

<p>The amygdala. (B)</p> Signup and view all the answers

Which best explains how the opponent-process theory contributes to our understanding of color vision?

<p>It explains afterimages and how color perception is organized in opposing pairs. (B)</p> Signup and view all the answers

What is the primary role of the thalamus in sensory processing?

<p>To relay and filter sensory information to the cerebral cortex. (D)</p> Signup and view all the answers

Damage to the hippocampus would most likely result in:

<p>Inability to form new long-term memories. (B)</p> Signup and view all the answers

Flashcards

Sensation

The process of detecting physical energy and converting it into neural signals.

Perception

The organizing and interpreting of sensory information.

Weber's Law

States that the just noticeable difference is a constant proportion of the original stimulus.

Trichromatic Theory

Suggests three types of cones sensitive to red, green, and blue.

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Dendrites

Structures that receive signals from other neurons.

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Axon

Transmits signals away from the neuron cell body.

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Dopamine

A neurotransmitter involved in reward, motivation, and motor control.

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Hippocampus

A brain structure essential for memory formation.

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Acetylcholine

A neurotransmitter primarily involved in muscle movement.

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Hypothalamus

Brain structure regulating hunger and thirst.

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Cerebellum

Brain structure responsible for coordination of voluntary movements.

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Limbic System

Involved in emotional regulation and memory.

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Basal Ganglia

Brain structure that coordinates movement.

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Synaptic Transmission

Process where neurotransmitters are released into the synaptic cleft.

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GABA

Primary inhibitory neurotransmitter in the central nervous system.

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Cerebral Cortex Lobes

The cerebral cortex is divided into four lobes.

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Occipital Lobe

Lobe primarily responsible for processing visual information.

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Thalamus

Acts as a relay station for sensory information.

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Neuroplasticity

The brain's ability to reorganize itself.

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Corpus Callosum

Structure that connects left and right hemispheres of the brain.

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Temporal Lobe

Region of the brain involved in auditory processing and memory.

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Weber’s Law

The JND between stimuli is a constant proportion of the original stimulus intensity.

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Cochlea

Part of the ear where sound waves are converted into neural signals.

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Myelin Sheath

Insulates the axon and speeds up signal transmission.

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Place Theory

Theory suggesting different frequencies of sound activate different areas of the cochlea.

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Absolute Threshold

The smallest amount of stimulus energy needed for detection.

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Rods

Photoreceptors in the retina responsible for low-light vision.

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Lens

Part of the eye that focuses light onto the retina.

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Optic Nerve

Transmits visual information from the retina to the brain.

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Opponent-Process Theory

Theory stating pairs of colors are processed together (e.g., red-green).

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Monocular Cue

A depth perception cue that requires only one eye.

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Iris

Controls the amount of light entering the eye.

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Sensory Adaptation

Phenomenon where sensory receptors become less sensitive to constant stimuli.

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Brainstem Function

Controls basic life functions such as breathing and heart rate.

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Hypothalamus Role

Regulates the sleep-wake cycle and body temperature.

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Glial Cells Function

Provide support and protection for neurons.

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Amygdala

Involved in the fear response.

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Somatosensory Cortex

Processes sensory information from the body.

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Motor Cortex

Responsible for voluntary movement.

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Norepinephrine

A neurotransmitter involved in attention and arousal.

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Thalamus Function

Acts as a relay station for sensory information.

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Transduction

The process by which external stimuli are converted to internal signals.

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Study Notes

Sensation and Perception

  • Sensation involves detecting and converting environmental energy into neural signals.
  • Perception is the organization, interpretation, and conscious experience of sensory information.
  • Weber's Law describes the constant proportion between the just noticeable difference (JND) and the original stimulus intensity (ΔI/I = k).
  • Vision involves the cornea, lens, retina (rods and cones), and optic nerve for light focusing and signal transmission.
  • Color vision theories include trichromatic (three cone types: red, green, blue) and opponent-process (color pairs: red-green, blue-yellow).
  • Hearing involves the outer (pinna, auditory canal), middle (ossicles), and inner ear (cochlea) for sound wave conversion to neural signals.
  • Pitch perception theories include frequency (pitch based on wave frequency) and place (different frequencies activate different cochlear spots).

Physiological/Behavioral Neuroscience

  • Neurons are the building blocks of the nervous system, with dendrites receiving signals, a cell body (soma) containing the nucleus, an axon sending signals, and a myelin sheath for signal speed.
  • Key neurotransmitters include dopamine (reward, motivation, motor control), serotonin (mood, appetite, sleep), and GABA (main inhibitory neurotransmitter).

Brain Structures

  • The hippocampus is crucial for memory formation.
  • The amygdala processes emotions, particularly fear and pleasure.
  • The cerebral cortex is divided into four lobes: frontal (reasoning, planning, movement), parietal (sensory information), temporal (auditory processing, memory), and occipital (visual processing).

GRE-Style Review Questions and Answers

  • Comprehensive review of core concepts, formulas, and application of knowledge in biological psychology, covering a broad spectrum of topics from sensation, perception, neurological function, and brain structures. Answers are provided for each question, emphasizing practical application and problem-solving skills essential for GRE preparation in biological psychology.

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Description

Explore sensation, perception, and neuroscience. Learn about detecting environmental energy, Weber's Law, vision components like the cornea and retina, color vision theories, hearing processes, and pitch perception. Understand the basics of physiological and behavioral neuroscience.

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