PMID: 2487644Jan 1, 1989Paper

Evoked responses to sinusoidal gratings in the pigeon optic tectum

Visual Neuroscience
V PorciattiP Bagnoli

Abstract

Tectal evoked potentials (TEPs) in response to sinusoidal gratings of different contrast, spatial and temporal frequency have been recorded from the tectal surface of the pigeon. Responses have been digitally filtered in order to isolate transient oscillatory (fast) potentials (50-150 Hz), transient slow potentials (1-50 Hz), and the steady-state second-harmonic component (16.6 Hz). Transient slow potentials, as well as the steady-state second-harmonic component, are band-pass spatially tuned with a maximum at 0.5 cycles/deg and attenuation at higher and lower spatial frequencies. The high spatial frequency cutoff is 4-5 cycles/deg. Both transient slow potentials and the steady-state second-harmonic component increase in amplitude as a function of log contrast and saturate at about 20% contrast. The contrast sensitivity, as determined by extrapolating TEP amplitude to 0 V is 0.1-0.2%. These characteristics of spatial-frequency selectivity and contrast sensitivity are similar to those reported for single tectal cells. Unlike slow potentials, oscillatory potentials are not band-pass spatially tuned. In addition, their contrast response function does not saturate at moderate contrast. These differences suggest that tectal evoked s...Continue Reading

References

Jan 1, 1979·Vision Research·D Jassik-Gerschenfeld, O Hardy
Oct 1, 1976·Quarterly Journal of Experimental Physiology and Cognate Medical Sciences·P G Clarke, D Whitteridge
Jan 1, 1986·Vision Research·D Regan, H Spekreijse
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Mar 1, 1987·Documenta Ophthalmologica. Advances in Ophthalmology·V PorciattiG Fontanesi
Jan 1, 1985·Vision Research·H SpekreijseD Regan
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Jan 1, 1984·Experimental Brain Research·P BagnoliR Barsellotti
Oct 26, 1981·Brain Research·P BagnoliM Pellegrino
Jan 1, 1961·Documenta Ophthalmologica. Advances in Ophthalmology·T SHIPLEY

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Citations

Jan 1, 1991·Vision Research·V PorciattiF Bramanti
Nov 5, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·B K DellenR Wessel

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