Neurophysiological Evaluation of Orientation and Spatial Frequency Discrimination
Bradley, A., Skottun, B.C., Ohzawa, I., Sclar, G., and Freeman, R.D. (1985)
Neurophysiological evaluation of the differential response model for orientation and spatial frequency discrimination.
J. Opt. Soc. Am. A 2: 1607-1610.
Recent models have attempted to reconcile low psychophysical
orientation and spatial-frequency discrimination thresholds with relatively
broad orientation and spatial-frequency tuning of cortical neurons. These
models have relied on the ability of the neurons to convert small stimulus
changes into reliable response changes. We have examined this ability in a
sample of neurons from the cat's striate cortex. We present here data from
two cells that reliably signaled the smallest orientation and
spatial-frequency differences. Using receiver operating characteristic
analysis, we find that these cells could reliably signal orientation
differences of 1.84 deg and spatial-frequency differences of 0.073 octave.
We compare these single-cell results to cat and human behavioral