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Which of the following is true about methods of studying visual perception? a. An advantage of studying patients with closed head injury is that it is easy to control the region of brain damageb. An advantage of coarse staining techniques (e.g. cresyl violet) is that it can be performed on living human beings. c. A disadvantage of direct brain stimulation during craniotomy is that it is very painful for the patient.d. A disadvantage of visual psychophysics is that there is no way to quantify (or plot on a graph) the experimental results.e. One goal of functional imaging studies is to determine which regions of the brain respond to specific visual stimulation.

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