-transparent.png){kind=logo}
Experiments have been performed on unanaesthetized and paralysed cats. The tuning curves for spatial frequency of retinal, lateral geniculate and simple and complex cells of the cortex have been determined in response to sinusoidal gratings of various spatial frequencies at different levels of mean luminance. For all neurones, decreasing the mean luminance leads to a progressive loss of spatial resolution and contrast sensitivity. Retinal ganglion cells of type X show, for scotopic levels of luminance, a flattening of their spatial frequency tuning curves in the low spatial frequency range. For geniculate and cortical neurones, on the contrary, the spatial frequency characteristics at the various levels of luminance remain practically invariant in their bandwidth. On the average, complex cells still respond to mean luminances ten times lower than simple cells. The tuning curves for orientation of cortical cells maintain, to a first approximation, the same shape at the various levels of mean luminance. The results are discussed comparing the electrophysiological with psychophysical data.
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
January 1985,
Experimental brain research,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
November 2013,
Neuroscience research,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
January 1983,
Vision research,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
January 1988,
Vision research,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
February 1982,
The Journal of physiology,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
January 2016,
eNeuro,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
October 1979,
The Journal of physiology,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
June 2008,
Experimental brain research,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
March 1996,
The Journal of the Acoustical Society of America,
S Bisti, and
R Clement, and
L Maffei, and
L Mecacci
February 2002,
Physical review letters,
