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Face representation in the human secondary somatosensory cortex.
Binh T Nguyen1, Koji Inui, Minoru Hoshiyama
1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki 444-8585, Japan. binh@nips.ac.jp
Summary
The human face
Area of Science:
- Neuroscience
- Human sensory processing
Background:
- The secondary somatosensory cortex (SII) plays a crucial role in processing tactile information.
- Understanding the somatotopic organization of SII is essential for mapping sensory representations.
Purpose of the Study:
- To investigate the somatotopic organization of facial skin representation within the human secondary somatosensory cortex (SII).
Main Methods:
- Magnetoencephalography (MEG) was used to record somatosensory evoked magnetic fields.
- Air-puff stimulation was applied to the foot, lip, forehead, cheek, and mandibular angle.
- Dipole locations in SII were analyzed and compared across stimulated body sites.
Main Results:
- A somatotopic map was observed in SII, with the foot represented medially, the lip laterally, and the face in an intermediate region.
- No significant differences in dipole localization were found among the three stimulated facial skin areas (forehead, cheek, mandibular angle).
Conclusions:
- Facial skin areas occupy a small region in SII with limited spatial resolution for differentiation.
- This study provides the first systematic investigation of activated regions in SII following facial skin stimulation.