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The amount of information transmitted about contrast by neurones in the cat's visual cortex

Published online by Cambridge University Press:  02 June 2009

D. J. Tolhurst
Affiliation:
The Physiological Laboratory, Cambridge, England

Abstract

The responses of neurones in the cat's visual cortex are very variable in amplitude. Thus, although the average response amplitude of a single neurone depends closely upon the contrast of a sinusoidal grating, the instantaneous amplitude of the response can convey little information about the grating's contrast. This paper shows that a typical cortical neurone can convey less than one bit of information about contrast in 0.5 s. The amount of information that a neurone can convey is closely correlated with the neurone's responsivity.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1989

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References

Albrecht, D.G. & Hamilton, D.B. (1982). Striate cortex of cat and monkey: contrast response function. Journal of Neurophysiology 48, 217237.CrossRefGoogle Scholar
Barlow, H.B., Hawken, M., Kaushal, T.P. & Parker, A.J. (1987). Human contrast discrimination and the threshold of cortical neurons. Journal of the Optical Society of America A 4, 23662371.CrossRefGoogle ScholarPubMed
Bradley, A., Skottun, B.C., Ohzawa, I., Sclar, G. & Freeman, R.D. (1987). Visual orientation and spatial-frequency discrimination: a comparison of single neurons and behavior. Journal of Neurophysiology 57, 755772.CrossRefGoogle ScholarPubMed
Dean, A.F. (1981 a). The variability of discharge of simple cells in the cat striate cortex. Experimental Brain Research 44, 437440.CrossRefGoogle ScholarPubMed
Dean, A.F. (1981 b). The relationship between response amplitude and contrast for cat striate cortical neurones. Journal of Physiology 318, 413427.CrossRefGoogle ScholarPubMed
Dean, A.F. & Tolhurst, D.J. (1983). On the distinctness of simple and complex cells in the visual cortex of the cat. Journal of Physiology 344, 305325.CrossRefGoogle ScholarPubMed
Enroth-Cugell, C. & Robson, J.G. (1966). The contrast sensitivity of retinal ganglion cells of the cat. Journal of Physiology 187, 517552.CrossRefGoogle ScholarPubMed
Fuller, M.S. & Looft, S.J. (1984). Information theoretic analysis of cutaneous receptor responses. IEEE Transactions in Biomedical Engineering 31, 377383.CrossRefGoogle ScholarPubMed
Gilbert, C.D. (1977). Laminar differences in'receptive-field properties in cat primary visual cortex. Journal of Physiology 268, 391421.CrossRefGoogle ScholarPubMed
Hubel, D.H. & Wiesel, T.N. (1962). Receptive fields, binocular interactions, and functional architecture in the cat's visual cortex. Journal of Physiology 160, 106154.CrossRefGoogle ScholarPubMed
Ikeda, H. & Wright, M.J. (1974). Sensitivity of neurones in visual cortex (area 17) under different levels of anesthesia. Experimental Brain Research 20, 471484.CrossRefGoogle Scholar
Maffei, L. & Fiorentini, A. (1973). The visual cortex as a spatial-frequency analyzer. Vision Research 13, 12551268.CrossRefGoogle Scholar
Matthews, P.B.C. & Stein, R.B. (1969). The regularity of primary and secondary muscle spindle afferent discharges. Journal of Physiology 202, 5977.CrossRefGoogle ScholarPubMed
Optican, L.M. & Richmond, B.J. (1987). Temporal encoding of two-dimensional patterns by single units in primate inferior temporal cortex. III. Information theoretic analysis. Journal of Neurophysiol-ogy 57, 162178.CrossRefGoogle ScholarPubMed
Press, W.H., Flannery, B.P., Teukolsky, S.A. & Vetterling, W.T. (1986). Numerical Recipes: The Art of Scientific Computing. United Kingdom: Cambridge University Press: Cambridge.Google Scholar
Skottun, B.C., Bradley, A., Sclar, G., Ohzawa, I. & Freeman, R.D. (1987). The effects of contrast on visual orientation and spatial-frequency discrimination: a comparison of single cells and behavior. Journal of Neurophysiology 57, 773786.CrossRefGoogle ScholarPubMed
Tolhurst, D.J., Movshon, J.A. & Dean, A.F. (1983). The statistical reliability of signals in single neurons in cat and monkey visual cortex. Vision Research 23, 775785.CrossRefGoogle Scholar
Tolhurst, D.J., Movshon, J.A. & Thompson, I.D. (1981). The dependence of response amplitude and variance of cat visual cortical neurones on stimulus contrast. Experimental Brain Research 41, 414419.Google ScholarPubMed
Werner, G. & Mountcastle, V.B. (1965). Neural activity in mechano-receptive cutaneous afferents: stimulus-response relations, Weber functions, and information transmission. Journal of Neurophysiology 28, 359397.CrossRefGoogle Scholar