Evoked responses to sinusoidal gratings in the pigeon optic tectum.

Vittorio Porciatti, R. Alesci, P. Bagnoli

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 slow and fast potentials reflect the activity of different neuronal mechanisms.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalVisual Neuroscience
Volume2
Issue number2
StatePublished - Dec 1 1989
Externally publishedYes

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Contrast Sensitivity
Superior Colliculi
Columbidae
Evoked Potentials

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Evoked responses to sinusoidal gratings in the pigeon optic tectum. / Porciatti, Vittorio; Alesci, R.; Bagnoli, P.

In: Visual Neuroscience, Vol. 2, No. 2, 01.12.1989, p. 137-145.

Research output: Contribution to journalArticle

Porciatti, Vittorio ; Alesci, R. ; Bagnoli, P. / Evoked responses to sinusoidal gratings in the pigeon optic tectum. In: Visual Neuroscience. 1989 ; Vol. 2, No. 2. pp. 137-145.
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