Question 1

Pigeons have ____ vision.

Accepted Answer

Pigeons have pentachromatic vision, meaning they can see five different colors.

Question 2

Which animal did David Hubel and Tortsen Wiesel use for their experiment on the communication of cells in the visual cortex?

Accepted Answer

David Hubel and Torsten Wiesel conducted their pioneering experiments on the visual cortex using cats. They discovered how cells in the visual cortex respond to different visual stimuli, such as lines and edges, which was a fundamental contribution to our understanding of visual processing.

Question 3

The rods ____.

Accepted Answer

Rods are specialized for night vision, allowing us to see in low light conditions, and they detect black, white, and gray patterns but do not detect colors.

Question 4

Which of the following is true?

Accepted Answer

In dim light, the muscle fibers in the iris contract to dilate the pupil, allowing more light to enter the eye for better vision. This is a physiological response to low light conditions to improve visibility.

Question 5

The ____ is a clear jellylike liquid that occupies the space behind the lens.

Accepted Answer

The vitreous humor is the clear jellylike substance that fills the space behind the lens of the eye, maintaining its shape.

Question 6

What is the best way to explain to a child why he or she sees a leaf as green?

Accepted Answer

The answer of What is the best way to explain...

Question 7

This distance at which the lens of the eye can no longer accommodate to bring objects into focus is called the ____.

Accepted Answer

The near point is the closest distance at which the eye can focus on an object. As people age, this point generally moves farther away, a condition known as presbyopia.

Question 8

What are the cells called in the visual cortex that respond only to a highly specific characteristic of a visual stimulus,such as an angle,straight edge,spot movement,or brightness?

Accepted Answer

Feature detectors are specialized neurons in the visual cortex that respond to specific characteristics of a visual stimulus, such as angles, edges, or movement.

Question 9

Any color can be created by combining the light wavelengths of three primary colors.What are those colors?

Accepted Answer

The primary colors of light are red, green, and blue. When combined in various ways, they can create any color in the visible spectrum.

Question 10

Which of the following is a function of the lateral geniculate nucleus?

Accepted Answer

The lateral geniculate nucleus is responsible for organizing information about color and other aspects of the visual field.

Question 11

As people get past the age of 45,the distance of the near point increases because ____.

Accepted Answer

Aging causes a loss in the elasticity of the lens, which affects the eye's ability to focus on close objects, leading to an increase in the distance of the near point. This condition is known as presbyopia.

Question 12

What happens to the axons of the ganglion cells that make up the optic nerve at the point where they leave the eyes?

Accepted Answer

At the optic chiasm, the axons from the ganglion cells in the optic nerve partially cross over to the opposite side of the brain, allowing visual information from each eye to be processed by both hemispheres.

Question 13

Apart from humans,which of the following has trichromatic vision?

Accepted Answer

The answer of Apart from humans,which of the following has...

Question 14

Which one of the following has all-rod eyes?

Accepted Answer

Rats have all-rod eyes, which means they lack cone cells and therefore have poor color vision but excellent night vision. This adaptation is common in animals that are nocturnal or operate in low-light conditions.

Question 15

Hubel and Wiesel received the Nobel Prize in Physiology in 1981.What was their achievement?

Accepted Answer

Hubel and Wiesel were awarded the Nobel Prize for their work in discovering how visual information is processed in the brain. They identified that specific cells in the visual cortex are tuned to respond to specific patterns of light and shapes, such as edges and bars, which was a fundamental breakthrough in understanding the complex process of visual perception.

Question 16

The ____ is the primary area for visual processing in less developed animals,like frogs.

Accepted Answer

The superior colliculus is a structure in the midbrain that plays an important role in visual processing, particularly in animals with less complex visual systems, such as frogs. It helps mediate reflexive responses to visual stimuli.

Question 17

Which part of the brain controls the eye movement?

Accepted Answer

The superior colliculus, located in the midbrain, plays a crucial role in controlling eye movements, including saccadic eye movements (rapid movements of the eye between fixation points) and coordinating head and eye movements.

Question 18

Shortly after leaving the optic chiasm,the optic nerve fibers diverge along two pathways.Eighty percent of the nerve fibers are connected to the ____ of the thalamus,and most of the others are attached to the ____ in the midbrain.

Accepted Answer

After leaving the optic chiasm, the majority of optic nerve fibers project to the lateral geniculate nucleus (LGN) of the thalamus, which is a primary relay center for visual information en route to the visual cortex. A smaller portion of the fibers project to the superior colliculus in the midbrain, which is involved in reflexive responses to visual stimuli.

Question 19

Our just-noticeable difference threshold is so low for colors that the average person can discriminate between how many different colors?

Accepted Answer

The average person can discriminate between approximately two million different colors, thanks to the human eye's sensitivity and the brain's processing capabilities.

Question 20

Before the information is sent on to the brain,a great deal of complex information processing takes place in the ____.

Accepted Answer

The retina is responsible for converting light into neural signals and performs initial processing of visual information before it is sent to the brain.

Quiz 4: Sensation and Perception