Vision (Winter 2023)

What role do the amacrine cells play in the visual pathway?

• They assist the photoreceptors in detecting colour.

• They play a role in providing nutrients for the photoreceptor.

• They are responsible for the convergence of visual information in the retina.

• They increase the speed of light processing in the retina.

Zainab is watching a red car pass through her visual field. Which of the following would accurately describe the visual processing occurring in Zainab's brain?

• When looking at the car with her left eye, visual information about the car would only travel to the right side of her brain.

• Most of the retinal cells carrying the visual stimulus will synapse in the medial reticulate nucleus (MGN) in the thalamus before being sent to the primary visual cortex.

• The complex processing of a moving visual stimulus would make it more likely that the receptive field of a V1 cell would be comprised of inputs from only a few lateral geniculate nuclei.

• A visual stimulus of a tree that was processed in an area of the retina close to the car would also be processed in a nearby area of the primary visual cortex.

Which of the following correctly describes a difference between rods and cones?

• Rods operate at high light intensities, while cones operate at low light intensities.

• Rods are concentrated in the fovea of the retina, while cones are concentrated in the periphery of the retina.

• Rods confer low spatial acuity, while cones confer information about the details of objects.

• Rods send their information to the bipolar cells, while cones send their information to the ganglion cells.

A wazzit is a small mammal that is preyed on by larger animals. Thus, wazzits only leave their homes at night to feed. What type of eyes would they most likely have?

• Small eyes placed laterally on the head

• Small eyes with a crude lens

• Big eyes placed towards the front of the head

• Big eyes placed laterally on the head

Wavelength and amplitude, respectively, determine which of the following characteristics of light?

• Colour and brightness.

• Brightness and colour.

• Brightness and saturation.

• Colour and saturation.