PYSY208 W4 VISION

What is the range of wavelengths that humans perceive?

• 200 to 400 nanometers

• 400 to 700 nanometers

• 700 to 800 nanometers

• 100 to 200 nanometers

What are the two major interpretations of color vision?

• Trichromatic theory and Opponent-process theory

• Color constancy and Retinex theory

• Brightness and Color

• Visual pathways and Receptive fields

What does the Opponent-Process Theory suggest?

• We perceive color in terms of paired opposites

• Color perception occurs through the relative rates of response by three kinds of cones

• The brain has a mechanism that perceives color on a continuum

• Afterimages depend on the whole context

What is color vision deficiency?

• An impairment in perceiving color differences

• The ability to recognize color despite changes in lighting

• The perception of color is dependent upon the wavelength of the light

• A condition where the eyes do not point in the same direction

What is the receptive field?

• The part of the visual field that either excites or inhibits a cell

• The area of the retina that contains photoreceptors

• The region of the brain responsible for visual processing

• The distance between the eyes that affects depth perception

What are the three categories of ganglion cells in primates?

• Parvocellular, Magnocellular, Koniocellular

• Simple, Complex, End-stopped

• Bipolar, Horizontal, Amacrine

• Foveal, Peripheral, Central

What is prosopagnosia?

• The impaired ability to recognize faces

• The inability to determine the direction of movement

• The inability to recognize objects despite satisfactory vision

• A condition where the eyes do not point in the same direction

What is motion blindness?

• The inability to determine the direction, speed and whether objects are moving

• The inability to recognize faces

• The inability to perceive color differences

• The inability to identify objects

What happens during the sensitive/critical periods in visual development?

• Experiences have a particularly strong/enduring effect

• Cortical responses become sluggish but do not cause blindness

• Synapses in the visual cortex become unresponsive

• All of the above

What is the primary function of the retina?

• To focus light onto the lens

•  To regulate the size of the pupil

• To contain photoreceptors that convert light into neural signals

• To maintain the shape of the eye