May 2006
Volume 47, Issue 13
ARVO Annual Meeting Abstract  |   May 2006
Receptive Fields in the Limulus Brain
Author Affiliations & Notes
  • K. Mori
    Center for Vision Research, SUNY, Syracuse, NY
  • Y. Umino
    Center for Vision Research, SUNY, Syracuse, NY
  • T. Saito
    Center for Vision Research, SUNY, Syracuse, NY
  • R.B. Barlow
    Center for Vision Research, SUNY, Syracuse, NY
  • Footnotes
    Commercial Relationships  K. Mori, None; Y. Umino, None; T. Saito, None; R.B. Barlow, None.
  • Footnotes
    Support  NSF IBN 0077583, NIH MH49741, NIH EY00667, Research to Prevent Blindness and Lions Club of Central New York
Investigative Ophthalmology & Visual Science May 2006, Vol.47, 3115. doi:
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      K. Mori, Y. Umino, T. Saito, R.B. Barlow; Receptive Fields in the Limulus Brain . Invest. Ophthalmol. Vis. Sci. 2006;47(13):3115.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose: : To map the visual receptive fields of neurons in the medulla of the Limulus brain.

Methods: : To gain access to the brain we opened a hole on the dorsal carapace of the prosoma and removed overlying tissue and organs. After desheathing the brain, we penetrated neurons in the medulla with a glass microelectrode. We classified cells with full eye and single ommatidial illumination, mapped their receptive fields with pattern stimuli and recorded responses to underwater video scenes.

Results: : Responses of medullar cells can be classified into "simple" and "complex" types. Simple type "ON" and "OFF" responses are similar to those of vertebrate ganglion cells. "ON" response type can have excitatory receptive fields ranging from 6 to 40 degrees with no detectable surround components. Receptive fields of simple type "OFF" cells have not yet been mapped. Complex cells include "ON", "OFF" and "sustained" and "transient inhibitory" responses. Their receptive fields can be highly complex with noncontiguous regions of excitation and inhibition.

Conclusions: : We have previously reported that responses from medullar cells are similar to those recorded from retinal ganglion cells i.e. sustained and transient "ON" and "OFF" cells. Depending on response type, receptive fields can be simple or highly complex indicating several levels of visual processing in the medullar region of the Limulus brain.

Keywords: electrophysiology: non-clinical 

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