Abstract
Achromatic visual function in primates is distributed between two pathways from retina to cortex, the parvocellular and the magnocellular. The relative contribution of these to human achromatic vision is controversial and largely unknown. Here, we use an optic neuritis (ON) model to investigate the effects of a severe loss of parvocellular function on human contrast sensitivity. In our first experiment, we use Gabor stimuli (0.5 cpd, 2 Hz) to show that, compared to normal control eyes, ON causes selective deficits in the two chromatic, cone opponent pathways, with L/M cone opponency affected more than S cone opponency, and a relative sparing of achromatic function. Since L/M cone opponency is carried exclusively by the midget ganglion cells of the parvocellular pathway, this demonstrates a selective deficit of parvocellular function. In a second experiment, we report on two subjects who have lost all L/M cone opponent response in both eyes, indicating a severe loss of parvocellular function. We measure the spatial and temporal contrast sensitivity functions of their remaining achromatic vision, compared with a normal control group, to determine the selectivity of the visual deficit caused by the differential parvocellular loss, and assess the relative contributions of the parvocellular and magnocellular pathways to achromatic contrast sensitivity. We find that parvocellular function contributes selectively at mid- to high spatial frequencies (at low temporal frequencies), whereas magnocellular function determines contrast sensitivity over a very broad temporal frequency range (at low spatial frequencies). Our data bear a striking resemblance to results obtained from primate parvocellular lesions.
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Abbreviations
- ON:
-
Optic neuritis
- MS:
-
Multiple sclerosis
- L, M and S cones:
-
Long, medium and short wavelength sensitive cones
- P-cells:
-
Parvocellular cells
- M-Cells:
-
Magnocellular cells
- K-cells:
-
Koniocellular cells
- LGN:
-
Lateral geniculate nucleus of the thalamus
- Ach:
-
Achromatic
- RG:
-
Red-Green
- BY:
-
Blue-Yellow
- CPD:
-
Cycles per degree
- AE:
-
Affected eye
- FE:
-
Unaffected fellow eye
- NC:
-
Normal controls
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Acknowledgments
We extend our sincere gratitude to all of the subjects with ON who donated their time to help us collect data and especially to the subjects NK and GF who spent considerable time and effort to come to the laboratory on many occasions. We also thank all the control subjects for their time. We are grateful for the kind cooperation of the referring physicians (Drs. Jack Antel, Yves LaPierre, Amit Bar-Or, William Barkas and Francine Wein) and the help of Stanley Hum and Pamela Ng with patient records. This research was supported by a Canadian Institutes of Health Research (CIHR) grant MOP-10819 to KTM.
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Al-Hashmi, A.M., Kramer, D.J. & Mullen, K.T. Human vision with a lesion of the parvocellular pathway: an optic neuritis model for selective contrast sensitivity deficits with severe loss of midget ganglion cell function. Exp Brain Res 215, 293–305 (2011). https://doi.org/10.1007/s00221-011-2896-4
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DOI: https://doi.org/10.1007/s00221-011-2896-4