Question 5 A basketball player was rushed to the ER after falling on his backside while attempting to dunk a basketball. He broke the fall with the posterior portion of his head. He now has cortical blindness. What does this mean? ? The damage to the visual cortex in the occipital lobe was so great that he is now blind. ? The retinal photoreceptors were replaced with scar tissue from the damage to retinal blood tissue. ? The retina was deprived of oxygen too long, and consequently the cells died and cannot regenerate. ? He was given too much oxygen in the ER at first, which constricted blood vessels in the retina and thus the retina cells died.
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Cortical blindness is blindness caused by damage to the visual cortex of the brain, not the eyes themselves. Show more…
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Blindness could result from damage to which cortex and lobe of the brain? (A) visual cortex in the frontal lobe (B) visual cortex in the temporal lobe (C) sensory cortex in the parietal lobe (D) visual cortex in the occipital lobe (E) cerebral cortex in the occipital lobe
Basques L.
Blind Emotion: Exploring Visual Perception in Cortical Blindness When the area of the brain responsible for vision is destroyed, individuals experience cortical blindness. Patients with cortical blindness are unaware of any visual stimulus, including light. In a 52-year-old male patient with cortical blindness (as a result of two strokes within a 38-day timeframe), a series of visual stimuli were presented on a computer screen. The patient was given two choices for each stimulus and asked to report what was on the screen. The patient's responses were recorded by an individual behind the screen who could not see the contents on the screen. (a) An initial baseline test was conducted by presenting black squares and circles on the white background of the screen. The patient correctly "guessed" the item on the screen in 90 of the 200 trials. Researchers concluded that the patient's performance was not statistically different from chance. Explain what this means using the language of hypothesis testing. (b) Researchers then presented the patient with a randomized series of pictures depicting angry and happy faces. The patient was asked to report the emotion shown on the face. The patient answered correctly in 118 of 200 trials. Do these results suggest the patient's performance is statistically different from chance? If the results are statistically different from chance, construct a 95% confidence interval to estimate the proportion of correct answers. Note: Similar results were obtained for sad versus happy and fearful versus happy faces. (c) The researchers wanted to determine if the patient could identify other facial characteristics. They randomly showed male or female faces and asked the patient to identify the gender. The patient was correct in 89 of 200 trials. What does this suggest?
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A 42-year-old male patient is brought into the emergency room after being struck on the left side of the head with a board during a construction accident and knocked unconscious. When he recovers consciousness, he is able to hear but is no longer able to understand what is being said to him. From this, you suspect that he has experienced damage to the occipital lobe, parietal lobe, frontal lobe, or prefrontal lobe.
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