Figure 4: A.
Grand average of responses of contralateral cortical somatosensory areas
in 9 subjects to stimulation of the thumb during inattention (reading; top trace)
or during attention to stimuli (bottom trace). B. Subtraction of unattended
from attended responses, so as to yield "cognitive" components (labelled). C.
Detail of the earliest components of the unattended and attended responses,
showing that waves as early as 30 ms, post-stimulus, are enlarged during attention.
From Desmedt and Tomberg23 with permission.
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