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Separate finger representations at the human second somatosensory cortex.

R Hari¹, H Hämäläinen, M Hämäläinen

¹Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

|January 1, 1990

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The human second somatosensory cortex accurately maps different body areas. Responses to unexpected stimuli were significantly amplified compared to standard stimuli, demonstrating this precise somatotopic representation.

Area of Science:

Neuroscience
Somatosensory research
Human brain imaging

Background:

The second somatosensory cortex (SII) plays a crucial role in processing tactile information.
Understanding the functional organization of SII is key to comprehending somatosensory perception.

Purpose of the Study:

To investigate the functional representation of different body areas within the human second somatosensory cortex.
To examine how the SII responds to varying tactile stimuli and attention-based paradigms.

Main Methods:

Neuromagnetic responses were recorded in healthy human participants.
Cutaneous electrical stimulation was applied to the fingers.
An oddball paradigm was employed, varying stimulus location (thumb vs. middle finger).

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Main Results:

Electrical stimulation of fingers elicited responses in the SII around 100 ms.
Responses to deviant stimuli (middle finger) were nearly three times higher in amplitude than to standard stimuli (thumb).
This amplitude enhancement was observed even without intervening standard stimuli, suggesting a robust attentional effect.

Conclusions:

The human second somatosensory cortex maintains an accurate functional representation of distinct body areas.
SII exhibits heightened responses to attended or deviant tactile stimuli, indicating sophisticated sensory processing and attention allocation.