31 According to the passage, G.L. differed from Olausson’s other test subjects in terms of the
A) number of cortices activated in the brain during gentle brushing.
B) physical dimensions of the somatosensory cortex.
C) intensity of nerve signals required to activate the insular cortex.
D) effect of MRI scanning on the basic function of brain cortices.
per the text:
Olausson used functional MRI studies to examine
85 which areas of the brain lit up when G.L.’s arm was
gently brushed to activate CT fibers. In normal
subjects, both the somatosensory and insular cortices
were activated, but only the insular cortex [which
processes emotion] was active when researchers
90 brushed G.L.’s arm.