Passive touch is to experiencing stimulation of the skin as active touch is to experiencing the object.
There is stronger activation during active touch than passive touch in the adjacent basal touch region but no effect of stimulus roughness. In contrast, the parietal operculum (OP) was significantly affected by the roughness of the stimulus but not by the probing procedure.
Active touch also stimulated greater and more distributed brain activity than passive induction in areas outside the sensory brain region, possibly due to the motor component of the task. Our results suggest that different cortical regions may be involved in exploratory and surface texture processing, with exploratory procedures affecting activation in the primary somatosensory cortex and The excitatory properties affect relatively higher cortical regions in the sonosensory system.
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