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J Neurophysiol (May 23, 2007). doi:10.1152/jn.00802.2006
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Submitted on August 2, 2006
Accepted on May 19, 2007

Interspike interval analysis of retinal ganglion cell receptive fields

Daniel L. Rathbun1, Henry J. Alitto1, Theodore G Weyand2, and W. Martin Usrey1*

1 Center for Neuroscience, University of California, Davis, Davis, California, United States
2 Cell Biology & Anatomy, LSU Health Sciences Center, New Orleans, Louisiana, United States

* To whom correspondence should be addressed. E-mail: wmusrey{at}ucdavis.edu.

The interspike interval (ISI) preceding a retinal spike has a strong influence on whether retinal spikes will drive postsynaptic responses in the LGN. This ISI-based filtering of retinal spikes could, in principle, be utilized as a mechanism for processing visual information en route from retina to cortex; however, this form of processing has not been previously explored. Using a white-noise stimulus and reverse-correlation analysis, we compared the receptive fields associated with retinal spikes over a range of ISIs (0-120 msec). Results show that while the location and sign of retinal ganglion cell receptive fields are invariant to ISI, the size and amplitude of receptive fields do vary with ISI. These results support the notion that ISI-based filtering of retinal spikes can serve as a mechanism for shaping receptive fields.






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