Human contrast discrimination and the threshold of cortical neurons
Abstract
The human contrast-discrimination function has a curious shape: In addition to rising for increasing contrasts, both positive and negative, it also rises for very low contrasts on either side of zero. It is shown that this rise near zero contrast is not much affected by procedures that increase or decrease the subject's knowledge of the stimulus; this counts against uncertainty as the immediate cause of the elevation near zero contrast. The alternative explanation in terms of a genuine response threshold is shown to be promising when measurements of human contrast discrimination are compared with values calculated from records of neurons in monkey primary visual cortex. The comparison also suggests that the dynamic range of single neurons is lower than that shown psychophysically. It is suggested that having a cortical threshold may be the visual system's way of preventing false positives when there is much stimulus uncertainty. This threshold may also help to explain why quantum efficiencies calculated from detection thresholds are so poor compared with those estimated from the visual system's susceptibility to added noise.
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Several studies have found good agreement between population-level responses of gain-modulated neurons and psychophysical performance in visual contrast discrimination in humans and non-human primates.
“Indeed, several studies have found good agreement between the population-level responses of gain-modulated neurons (such as the population-average contrast response function) and psychophysical performance (for example, in visual contrast discrimination) in humans and non-human primates12,20–24.”
From Mechanisms underlying gain modulation in the cortex (2020) · cites this paper as [20]
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- Authors
- Barlow, H. B., Hawken, M., Parker, A. J., & Kaushal, T. P.
- Affiliations
- University of Oxford (GB)
- ORCID
- Parker, A. J.
- Venue
- Journal of the Optical Society of America A
- Publisher
- Optica Publishing Group
- Published
- 1987-12-01
- Volume
- 4
- Issue
- 12
- Pages
- 2366
- ISSN
- 1084-7529 (ISSN-L)
- 1520-8532
- OpenAlex
- W1992430091
- Cited by
- 79
- References
- 21
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 2 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 4 · 2012: 3
- FWCI
- 1.26
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the Optical Society of America A (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- contrast discrimination, response threshold, cortical neurons, primary visual cortex, dynamic range, stimulus uncertainty, false positives, quantum efficiency, detection threshold
- MeSH terms
- Humans, Neurons, Psychophysics, Sensory Thresholds, Visual Cortex, Visual Perception
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