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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 discrimination thresholds.
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
January 1991,
Vision research,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
January 1991,
Vision research,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
April 1987,
Perception & psychophysics,
A Bradley, and
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I Ohzawa, and
G Sclar, and
R D Freeman
January 1990,
Vision research,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
June 1990,
Journal of the Optical Society of America. A, Optics and image science,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
January 1981,
Vision research,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
January 1998,
Spatial vision,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
September 1998,
Vision research,
A Bradley, and
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I Ohzawa, and
G Sclar, and
R D Freeman
December 1970,
Perceptual and motor skills,
A Bradley, and
B C Skottun, and
I Ohzawa, and
G Sclar, and
R D Freeman
March 2003,
Journal of the Optical Society of America. A, Optics, image science, and vision,
