Visual System

What is the function of the lens?

• Convert light to neural signals

• Focus light onto the back of the retina

• Allow for more of less light to come into the eye by dilating or contracting

• To send neural pulses to the primary visual cortex

Which of the following are NOT examples of electromagnetic energy? (select all that apply)

• X-rays

• Ocean waves

• Sound waves

• FM radio waves

• Ultra-violet light

The colored part of your eye is called the

• Lens

• Retina

• Iris

• Pupil

Which of the primary colors is your favorite?

• Red

• Blue

• Green

Rods are mostly found in the _______ of the retina, and cones are mostly found in the _______ of the retina

• Periphery; center

• Center; periphery

• Left side; right side

• Right side; left side

• Back; front

Why do we have a blind spot?

• Because the sensory receptors in the eye are located at the back of the retina

• Because there are no receptors where the optic nerve exits the eye

• Because of the way the human eye evolved

• All of the above

What is the lateral geniculate nucleus (LGN)?

• The area of the brain where light is converted into neural signals by photoreceptors

• An area in the primary visual cortex where visual information is encoded

• The relay center for sensory visual information located in the thalamus

• The pathway that determines spatial location of visual information

Visual spatial information ("where" an object is) is encoded ____________ of the brain

• In the dorsal stream

• In the parietal cortex

• In the temporal cortex

• In the ventral stream

About how long does it take for visual information to be registered by the brain?

• Instantly

• 10 seconds

• 1/10th of a second

• 1 second

What kind of light can hummingbirds and bees see that humans can't?