A patient has an injury to the parietal lobe and has a selective deficit in processing information about the spatial location of visual stimuli. You hypothesize that this region of the brain is distinct in function from other visual areas in the temporal lobe, in which you suspect shape perception information is processed. To establish a double dissociation between the two functions and brain regions, you would need to find another person who had damage to the
A)same part of the parietal lobe but did not have a visuospatial deficit.
B)temporal lobe and had both visuospatial and shape perception deficits.
C)same part of the parietal lobe and had only a shape perception deficit.
D)temporal lobe and had only a shape perception deficit.

Question

Quizplus · Accepted Answer

To establish a double dissociation between the spatial location processing function of the parietal lobe and the shape perception function of the temporal lobe, we need to find another person with damage to the temporal lobe who has only a shape perception deficit, but no visuospatial deficit. This would show that the two functions are indeed independent and processed in separate brain regions. Option D fits this requirement. Option A does not fit because the patient has a visuospatial deficit, which is what we are trying to dissociate. Option B does not fit because the patient has both visuospatial and shape perception deficits. Option C does not fit because the patient has only a shape perception deficit, which does not establish a double dissociation.

A Patient Has an Injury to the Parietal Lobe and Has