Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 46.3, Problem 2R
Summary Introduction
To review:
The mechanism, by which a person with a severed corpus callosum is able to describe an object located in his left field of vision.
Introduction:
The corpus callosum is a bundle of nerve fibers, which divides the brain into the left and right hemispheres. It helps in the communication between the two hemispheres and integration of vision, motor, and sensory functions on the two sides of brain.
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Students have asked these similar questions
A person with epilepsy had a successful surgery to prevent the spread of epileptic activity between the two hemispheres of the brain.
When an object is presented to the left visual fields of both eyes, this person can see the object but cannot verbally describe the object.
When the object is presented to the right visual fields of both eyes, this person can see the object and is able to verbally describe the object.
a. Describe the visual pathway from left visual fields to perception in the brain.b. Identify the area of the brain responsible for speech production. Include the name of the area, the lobe(s) and the hemisphere of the brain it is located in. c. Explain why there is a disconnect between vision and speech in the person described at the beginning of this question.
Blindsight is the condition in which someone with damage in the primary visual cortex reports that they cannot see an object, but can usually guess what that object is. This means that some visual representation must reach the frontal speech area. What non-thalamic pathway might do that?
Question 8 options:
A)
The pathway through the suprachiasmatic nucleus
B)
The dorsal visual pathway
C)
The pathway through the superior colliculus
D)
The magnocelluar or M pathway
Cortical impairment of specific areas of visual integration can lead to deficient
object recognition. Which part of the cortex if damage lead to this agnosias?
superior temporal posterior area
inferior temporal cortex
occipital visual cortex
parahippocampal cortex
Chapter 46 Solutions
Life: The Science of Biology
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- Mr. Ally went to the eye doctor and complained about dark areas in his vision. He had never noticed it before. There is no pain. What is the diagnosis? Explain the reason behind floaters and dark areas in the visual field. How should the doctor treat Mr. Ally?arrow_forwardYou are driving at night on a two lane road, and you see a bright light. The light pass through your pupil, and your lens concentrates the light at retina. This stimulates the visual pathway. Your visual association center processes the signal from your eye and determines the lights is from a flashlight that an old lady is holding while crossing the street. Your visual association center sends a signal to your primary motor cortex, which sends a signal down the lateral corticospinal tract. This signal then proceeds down the spinal cord, out the posterior gray horn of the spinal cord, and out the ventral roots of efferent motor neurons. The motor signal travels from the sacral plexus and out towards the sciatic nerve. To answer this question, number the following steps in the correct order starting with the signal exiting the sciatic nerve. Number in order from 1-15 ______The cycle repeats and now many muscle fibers in the gastrocnemius begin to contracts in unison. _____Calcium ions…arrow_forwardThe lateral geniculate nuclei (LGN)are 6-layer structures in each hemisphere, which receive input from the retina from the ipsilateral and contralateral eyes. What is true of the layer distribution of the LGN regarding how they receive inputs from the eyes? layers 1, 4 and 6 from contralateral eye layers 4,5 and 6 from ipsilateral eye layers 2,3 and 5 from ipsilateral eye a) and c)arrow_forward
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- Bryan has normal vision and is wearing a special headset that shows a picture of a sailboat to his left eye and a picture of a dog to his right eye. What is Bryan's perception of these images most likely to be? He will only perceive whichever image is presented to his dominant eye. He will alternate between perceiving the sailboat and perceiving the dog. He will perceive the dog and the sailboat overlaid on top of each other. He will perceive parts of the dog and parts of the sailboat combined together in a fashion similar to a puzzle.arrow_forwardWhat is an example of an unconscious response to visual information?arrow_forwardWhat types of stimuli to neurons in the primary visual cortex respond to?arrow_forward
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