Author:
GIBBS M.A.,NORTHMORE D.P.M.
Abstract
We measured the photopic spectral sensitivity of
multiunit activity in the torus longitudinalis and optic
tectum of goldfish. Since negative contrast stimuli are
most effective for exciting torus longitudinalis, spiking
activity was evoked by the shadow of a disc moving through
a monochromatic light beam projected upon a screen. The
amount of activity evoked in torus longitudinalis generally
increased with the monochromatic stimulus radiance at the
same rate for all wavelengths, indicating a univariant
response. Spiking activity in tectum, however, increased
at different rates across the spectrum, indicating color-dependent
responses. The action spectra for torus longitudinalis
were all similar and relatively flat as expected of a homogeneous,
broad-band luminance processing system, and about 1 log
unit more sensitive than the tectal action spectra. The
latter generally displayed sharp peaks and dips in sensitivity
indicative of opponent processing.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
Cited by
13 articles.
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