A somatotopic map of vibrissa motion direction within a barrel column

Nat Neurosci. 2006 Apr;9(4):543-51. doi: 10.1038/nn1671. Epub 2006 Mar 19.

Abstract

Most mammals possess high-resolution visual perception, with primary visual cortices containing fine-scale, inter-related feature representations (for example, orientation and ocular dominance). Rats lack precise vision, but their vibrissa sensory system provides a precise tactile modality, including vibrissa-related 'barrel' columns in primary somatosensory cortex. Here, we examined the subcolumnar organization of direction preference and somatotopy using a new omni-directional, multi-vibrissa stimulator. We discovered a direction map that was systematically linked to somatotopy, such that neurons were tuned for motion toward their preferred surround vibrissa. This sub-barrel column direction map demonstrated an emergent refinement from layer IV to layer II/III. These data suggest that joint processing of multiple sensory features is a common property of high-resolution sensory systems.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Brain Mapping
  • Electric Stimulation
  • Male
  • Models, Anatomic
  • Motion Perception / physiology*
  • Neurons / cytology
  • Neurons / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Somatosensory Cortex* / anatomy & histology
  • Somatosensory Cortex* / physiology
  • Vibrissae / metabolism*