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Proceedings Paper

Optical visualization of stimulus-evoked fast neural activity and spreading waves in amphibian retina
Author(s): Xin-Cheng Yao; You-Bo Zhao; Chris M. Gorga
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Paper Abstract

High spatiotemporal resolution imaging is desirable for better understanding of dynamic information processing in the retina. Optical recording of stimulus-evoked neural activity can offer high spatial resolution with parallel monitor of many retinal neurons working together. We have recently demonstrated near infrared light imaging of fast intrinsic optical responses (FIORs) in activated amphibian retinas. High spatiotemporal resolution imaging of FIORs disclosed transient optical changes associated with electrophysiological responses. These FIORs were typically initiated from the center of the retinal area covered by the visible stimulus light pattern, and rapidly spread to surrounding area. Dynamic changes, i.e. amplitudes, polarities, and spreading patterns, of FIORs were dependent on the stimulus light intensity and delivery duration. In the retinal area covered by the visible light stimulus pattern, low strength stimuli evoked FIORs dominated by positive signals, but strengthened stimuli elicited negative-going responses. However, positive responses were consistently observed in surrounding area, beyond the edge of the stimulus light pattern at least 50 μm. Our experimental study and physiological analysis suggest that the negative FIORs are associated with the phototransduction of activated photoreceptors, and the positive FIORs result primarily from dynamic changes of second- and third-order neurons during retinal activation. Dynamic patterns and spreading waves of fast neural activity may reflect involvements of the feedback mechanisms, e.g. light adaptation and center-surround antagonism, of the retina.

Paper Details

Date Published: 22 February 2008
PDF: 8 pages
Proc. SPIE 6864, Biomedical Applications of Light Scattering II, 68640M (22 February 2008); doi: 10.1117/12.764048
Show Author Affiliations
Xin-Cheng Yao, Univ. of Alabama at Birmingham (United States)
You-Bo Zhao, Univ. of Alabama at Birmingham (United States)
Chris M. Gorga, Univ. of Alabama at Birmingham (United States)

Published in SPIE Proceedings Vol. 6864:
Biomedical Applications of Light Scattering II
Adam Wax; Vadim Backman, Editor(s)

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