Abstract

The recent paper by Pokorny and Smith [J. Opt. Soc. Am. A 14, 2477 (1997)] describes psychophysical data that correlate well with the physiology of the magnocellular and the parvocellular pathways. One of the critical differences between cells in these two pathways is the contrast of the visual input for which the responses of these cells start to saturate. In the analysis of their data, Pokorny and Smith have to assume values for the saturation contrast of the putative pathways that mediate detection. Here I reanalyze their model and show that this assumption is unnecessary, since values of the saturation contrast follow directly from their data.

© 1998 Optical Society of America

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References

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  1. B. B. Lee, “Receptive field structure in the primate retina,” Vision Res. 36, 631–644 (1996).
    [CrossRef] [PubMed]
  2. J. Pokorny, V. C. Smith, “Psychophysical signatures associated with magnocellular and parvocellular pathway contrast gain,” J. Opt. Soc. Am. A 14, 2477–2486 (1997).
    [CrossRef]
  3. L. J. Croner, E. Kaplan, “Receptive fields of P and M ganglion cells across the primate retina,” Vision Res. 35, 7–24 (1995).
    [CrossRef] [PubMed]
  4. J. B. Troy, B. B. Lee, “Steady discharges of macaque retinal ganglion cells,” Visual Neurosci. 11, 111–118 (1994).
    [CrossRef]
  5. G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
    [CrossRef] [PubMed]
  6. L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
    [CrossRef] [PubMed]
  7. M. W. Levine, “Variability of responses to sinusoidal modulation,” Visual Neurosci. 11, 155–163 (1994).
    [CrossRef]
  8. E. H. Adelson, “Saturation and adaptation in the rod system,” Vision Res. 22, 1299–1312 (1982).
    [CrossRef] [PubMed]
  9. A. B. Watson, “Transfer of contrast sensitivity in linear visual networks,” Visual Neurosci. 8, 65–76 (1992).
    [CrossRef]

1997

1996

B. B. Lee, “Receptive field structure in the primate retina,” Vision Res. 36, 631–644 (1996).
[CrossRef] [PubMed]

1995

L. J. Croner, E. Kaplan, “Receptive fields of P and M ganglion cells across the primate retina,” Vision Res. 35, 7–24 (1995).
[CrossRef] [PubMed]

1994

J. B. Troy, B. B. Lee, “Steady discharges of macaque retinal ganglion cells,” Visual Neurosci. 11, 111–118 (1994).
[CrossRef]

M. W. Levine, “Variability of responses to sinusoidal modulation,” Visual Neurosci. 11, 155–163 (1994).
[CrossRef]

1993

L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
[CrossRef] [PubMed]

1992

A. B. Watson, “Transfer of contrast sensitivity in linear visual networks,” Visual Neurosci. 8, 65–76 (1992).
[CrossRef]

1990

G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
[CrossRef] [PubMed]

1982

E. H. Adelson, “Saturation and adaptation in the rod system,” Vision Res. 22, 1299–1312 (1982).
[CrossRef] [PubMed]

Adelson, E. H.

E. H. Adelson, “Saturation and adaptation in the rod system,” Vision Res. 22, 1299–1312 (1982).
[CrossRef] [PubMed]

Croner, L. J.

L. J. Croner, E. Kaplan, “Receptive fields of P and M ganglion cells across the primate retina,” Vision Res. 35, 7–24 (1995).
[CrossRef] [PubMed]

L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
[CrossRef] [PubMed]

Kaplan, E.

L. J. Croner, E. Kaplan, “Receptive fields of P and M ganglion cells across the primate retina,” Vision Res. 35, 7–24 (1995).
[CrossRef] [PubMed]

L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
[CrossRef] [PubMed]

Lee, B. B.

B. B. Lee, “Receptive field structure in the primate retina,” Vision Res. 36, 631–644 (1996).
[CrossRef] [PubMed]

J. B. Troy, B. B. Lee, “Steady discharges of macaque retinal ganglion cells,” Visual Neurosci. 11, 111–118 (1994).
[CrossRef]

Lennie, P.

G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
[CrossRef] [PubMed]

Levine, M. W.

M. W. Levine, “Variability of responses to sinusoidal modulation,” Visual Neurosci. 11, 155–163 (1994).
[CrossRef]

Maunsell, J. H. R.

G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
[CrossRef] [PubMed]

Pokorny, J.

Purpura, K.

L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
[CrossRef] [PubMed]

Sclar, G.

G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
[CrossRef] [PubMed]

Smith, V. C.

Troy, J. B.

J. B. Troy, B. B. Lee, “Steady discharges of macaque retinal ganglion cells,” Visual Neurosci. 11, 111–118 (1994).
[CrossRef]

Watson, A. B.

A. B. Watson, “Transfer of contrast sensitivity in linear visual networks,” Visual Neurosci. 8, 65–76 (1992).
[CrossRef]

J. Opt. Soc. Am. A

Proc. Natl. Acad. Sci. USA

L. J. Croner, K. Purpura, E. Kaplan, “Response variability in retinal ganglion cells of primates,” Proc. Natl. Acad. Sci. USA 90, 8128–8130 (1993).
[CrossRef] [PubMed]

Vision Res.

L. J. Croner, E. Kaplan, “Receptive fields of P and M ganglion cells across the primate retina,” Vision Res. 35, 7–24 (1995).
[CrossRef] [PubMed]

E. H. Adelson, “Saturation and adaptation in the rod system,” Vision Res. 22, 1299–1312 (1982).
[CrossRef] [PubMed]

G. Sclar, J. H. R. Maunsell, P. Lennie, “Coding of image contrast in central visual pathways of the macaque monkey,” Vision Res. 30, 1–10 (1990).
[CrossRef] [PubMed]

B. B. Lee, “Receptive field structure in the primate retina,” Vision Res. 36, 631–644 (1996).
[CrossRef] [PubMed]

Visual Neurosci.

A. B. Watson, “Transfer of contrast sensitivity in linear visual networks,” Visual Neurosci. 8, 65–76 (1992).
[CrossRef]

J. B. Troy, B. B. Lee, “Steady discharges of macaque retinal ganglion cells,” Visual Neurosci. 11, 111–118 (1994).
[CrossRef]

M. W. Levine, “Variability of responses to sinusoidal modulation,” Visual Neurosci. 11, 155–163 (1994).
[CrossRef]

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R=R0+Rmax C/(C+Csat),
ΔC=(δ/Rmax)(Csat+C)2/[Csat-(δ/Rmax)(Csat+C)]
ΔC0=(δ/Rmax)1-(δ/Rmax)Csat.
ΔC=ΔC0(1+C/Csat)2.

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