PSYC 5130 Transduction: Photoreceptors Quiz
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Questions and Answers

Which type of photoreceptor cells are more abundant in the human eye?

  • Bipolar cells
  • Ganglion cells
  • Cones
  • Rods (correct)

Where in the retina do cones have a higher concentration than rods?

  • Ganglion cell layer
  • Peripheral region
  • Fovea (correct)
  • Bipolar cell layer

Which part of the retina is responsible for the highest acuity vision?

  • Ganglion cell layer
  • Bipolar cell layer
  • Peripheral region
  • Fovea (correct)

What is the function of the extraocular muscles in the eye?

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

What is the main difference between rod and cone cells?

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

Which cells allow light to directly reach the photoreceptors without passing through other retinal layers?

<p>Cells in the fovea (A)</p> Signup and view all the answers

What is the first step in the process of visual perception?

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

What is the resting potential in most neurons?

<p>-70 mV (A)</p> Signup and view all the answers

Which type of ganglion cells are excited by light in the central field and inhibited by light in the surrounding field?

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

What effect occurs when ganglion cells are excited or inhibited for a prolonged period of time?

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

Which type of ganglion cells briefly detect moving or suddenly appearing stimuli?

<p>ON/OFF ganglion cells (A)</p> Signup and view all the answers

In the receptive fields of ganglion cells, what is emphasized in areas where luminance changes sharply?

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

Which theory states that ganglion cells exhibit a rebound effect after being excited or inhibited for a prolonged period?

<p>Opponent Process Theory (C)</p> Signup and view all the answers

What type of cell is primarily responsible for perceiving edge information in visual stimuli?

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

Which visual phenomenon involves the creation of emphasis on areas with sharp luminance changes?

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

'ON' and 'OFF' ganglion cells respond differently to stimuli presented in which parts of their receptive fields?

<p>'ON' responds to the center, 'OFF' responds to the surround (C)</p> Signup and view all the answers

What is the main difference between rod cells and cone cells?

<p>Cone cells are responsible for color vision, while rod cells are responsible for low-light vision. (B)</p> Signup and view all the answers

What is a potential cause of color blindness according to the text?

<p>Anomalies in one or more of the three types of cone opsins. (B)</p> Signup and view all the answers

Which theory proposes that mixing blue, green, and red receptor types gives us color perception?

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

What happens to a color-sensitive ganglion cell's firing rate when its receptive field is illuminated with a complementary color?

<p>The firing rate decreases. (C)</p> Signup and view all the answers

Which type of color blindness is characterized by a lack of the red cone?

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

How does the location of a neuron's receptive field depend on visual information?

<p>It depends on the location of photoreceptors in the retina. (A)</p> Signup and view all the answers

What is the main idea behind the Opponent Process Theory?

<p>When a portion is illuminated with a complementary color, firing rate decreases. (C)</p> Signup and view all the answers

In terms of rod and cone distribution in the retina, which statement is correct?

<p>Cones are concentrated in the fovea for high acuity vision, while rods are more prevalent in the periphery. (C)</p> Signup and view all the answers

Which cells in the retina are responsible for color vision?

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

What type of acuity is typically higher in the fovea compared to the periphery of the retina?

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

Which area of the brain is responsible for processing information from the optic nerves before transmitting it to the visual cortex?

<p>Dorsal lateral geniculate nucleus (LGN) (D)</p> Signup and view all the answers

What is a characteristic of 'Simple' Visual Cortex Cells according to Hubel and Wiesel?

<p>Respond to a bar of light in a particular orientation (A)</p> Signup and view all the answers

What is the main cause of color blindness in humans?

<p>Deficiency in cone cell types (D)</p> Signup and view all the answers

In the visual pathway, where do the axons of ganglion cells join together and cross over to form the optic chiasm?

<p>At the base of the brain (C)</p> Signup and view all the answers

'Center-Surround Fields' in retinal ganglion cells refer to:

<p>Patterns that enhance contrast perception (D)</p> Signup and view all the answers

'Extrastriate Cortex' refers to brain regions beyond which area?

<p>'Striate Cortex' (D)</p> Signup and view all the answers

What is the main difference between rod cells and cone cells?

<p>Rods work under low-intensity light, while cones require more light. (D)</p> Signup and view all the answers

What happens when light strikes a photoreceptor?

<p>Hyperpolarization occurs. (D)</p> Signup and view all the answers

How do ganglion cells in the fovea differ from those in the periphery?

<p>Ganglion cells in the periphery receive input from more photoreceptors than those in the fovea. (A)</p> Signup and view all the answers

What effect does light have on rhodopsin and cone-opsin?

<p>Light activates an enzyme that breaks down the messenger for opening Na+ channels. (A)</p> Signup and view all the answers

What process leads to hyperpolarization of the photoreceptors?

<p>Absorption of light by rhodopsin or cone-opsin (C)</p> Signup and view all the answers

How does decreased neurotransmitter release from a photoreceptor affect a bipolar cell?

<p>Leads to depolarization (D)</p> Signup and view all the answers

What happens when a photoreceptor releases less neurotransmitter?

<p>Ganglion cell is inhibited (B)</p> Signup and view all the answers

How do rods and cones differ in their response to light intensity?

<p>Rods require more light to respond compared to cones. (D)</p> Signup and view all the answers

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