Visual cortical neurons: are bars or gratings the optimal stimuli?

Neurons in the visual cortex of monkeys and cats have been characterized as either (i) bar and edge detectors or (ii) cells selective for certain spatial frequencies. To assess which of these functional descriptions is more accurate, we measured (i) the selectivity and (ii) the responsivity-sensitivity of these neurons to bars of various widths and gratings of various spatial frequencies. All of the cells recorded from were considerably more selective along the dimension of spatial frequency than along the dimension of bar width. Further, most were more responsive and sensitive to the grating of optimal frequency than to the bar of optimal width.

[1]  D. Hubel,et al.  Receptive fields of single neurones in the cat's striate cortex , 1959, The Journal of physiology.

[2]  D. Hubel,et al.  Receptive fields, binocular interaction and functional architecture in the cat's visual cortex , 1962, The Journal of physiology.

[3]  D. Hubel,et al.  Receptive fields and functional architecture of monkey striate cortex , 1968, The Journal of physiology.

[4]  J. Robson,et al.  Application of fourier analysis to the visibility of gratings , 1968, The Journal of physiology.

[5]  C Blakemore,et al.  On the existence of neurones in the human visual system selectively sensitive to the orientation and size of retinal images , 1969, The Journal of physiology.

[6]  G. F. Cooper,et al.  The spatial selectivity of the visual cells of the cat , 1969, The Journal of physiology.

[7]  C. Blakemore,et al.  The perceived spatial frequency shift: evidence for frequency‐selective neurones in the human brain , 1970, The Journal of physiology.

[8]  P. O. Bishop,et al.  Interaction effects of visual contours on the discharge frequency of simple striate neurones , 1971, The Journal of physiology.

[9]  Poggio Gf.  Spatial properties of neurons in striate cortex of unanesthetized macaque monkey. , 1972 .

[10]  M A Georgeson,et al.  Channels for spatial frequency selection and the detection of single bars by the human visual system. , 1972, Vision research.

[11]  L. Maffei,et al.  The visual cortex as a spatial frequency analyser. , 1973, Vision research.

[12]  B. Dow.  Functional classes of cells and their laminar distribution in monkey visual cortex. , 1974, Journal of neurophysiology.

[13]  P. Schiller,et al.  Quantitative studies of single-cell properties in monkey striate cortex. III. Spatial frequency. , 1976, Journal of neurophysiology.

[14]  D. H. Kelly.  Pattern detection and the two-dimensional Fourier transform: Flickering checkerboards and chromatic mechanisms , 1976, Vision Research.

[15]  J. Movshon,et al.  Spatial summation in the receptive fields of simple cells in the cat's striate cortex. , 1978, The Journal of physiology.

[16]  J. Movshon,et al.  Receptive field organization of complex cells in the cat's striate cortex. , 1978, The Journal of physiology.