Spatiotemporal mechanisms for detecting and identifying image features in human vision

Neri, Peter; Heeger, David J.

doi:10.1038/nn886

Cited by 134 publications

(118 citation statements)

References 28 publications

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“…The detection of salient targets in noisy one-dimensional movies has been investigated by Neri and Heeger (2002). Their observers were asked to foveally detect and identify a target in a short movie sequence (nine frames, total trial from approximately 500 msec to approximately 550 msec for 1º to 15º eccentricity (top graph, black; p .05 for a t test that compared ranges from 1º to 10º and from 11º to 20º).…”

Section: Discussionmentioning

confidence: 99%

Visual orienting in dynamic broadband (1/f) noise sequences

Rasche

Gegenfurtner

2010

Attention, Perception, & Psychophysics

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Section: Discussionmentioning

confidence: 99%

Visual orienting in dynamic broadband (1/f) noise sequences

Rasche

Gegenfurtner

2010

Attention, Perception, & Psychophysics

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“…However, our own stereoscopic system may have evolved to achieve a different goal: solving the correspondence problem not uniformly but preferentially for a location closer to the fovea or the centre of attention. In order to achieve timely behaviour, the limited capacity of the visual system does not permit detailed analyses of all inputs [49,50]. For a peripheral visual field, a simpler mechanism may be preferentially used to detect disparity without solving the correspondence problem, at the cost of falsely detecting disparity from illusory binocular inputs such as anti-correlated stimuli.…”

Section: (D) Functional Advantage Of Multiple Disparity Computationsmentioning

confidence: 99%

Weighted parallel contributions of binocular correlation and match signals to conscious perception of depth

Fujita

Doi

2016

Phil. Trans. R. Soc. B

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One contribution of 15 to a theme issue 'Vision in our three-dimensional world'. Binocular disparity is detected in the primary visual cortex by a process similar to calculation of local cross-correlation between left and right retinal images. As a consequence, correlation-based neural signals convey information about false disparities as well as the true disparity. The false responses in the initial disparity detectors are eliminated at later stages in order to encode only disparities of the features correctly matched between the two eyes. For a simple stimulus configuration, a feed-forward nonlinear process can transform the correlation signal into the match signal. For human observers, depth judgement is determined by a weighted sum of the correlation and match signals rather than depending solely on the latter. The relative weight changes with spatial and temporal parameters of the stimuli, allowing adaptive recruitment of the two computations under different visual circumstances. A full transformation from correlation-based to match-based representation occurs at the neuronal population level in cortical area V4 and manifests in single-neuron responses of inferior temporal and posterior parietal cortices. Neurons in area V5/MT represent disparity in a manner intermediate between the correlation and match signals. We propose that the correlation and match signals in these areas contribute to depth perception in a weighted, parallel manner.This article is part of the themed issue 'Vision in our three-dimensional world'.

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“…We used classification image analysis (Ahumada and Lovell, 1971;Gold et al, 2000;Eckstein and Ahumada, 2002;Neri and Heeger, 2002;Levi and Klein, 2003;Rajashekar et al, 2006), which allowed us to measure and compare the behaviorally defined, spatial receptive fields of the visual mechanisms responsible for saccadic and perceptual decisions. With this method, the entire brain is viewed as a single system in which input is the stimulus and output is either the saccadic or perceptual decision.…”

Section: Introductionmentioning

confidence: 99%

Similar Neural Representations of the Target for Saccades and Perception during Search

Eckstein¹,

Beutter²,

Pham³

et al. 2007

J. Neurosci.

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Are the body's actions and the mind's perceptions the result of shared neural processing, or are they performed largely independently? The brain has two major processing streams, and some have proposed that this division segregates visual processing for action and perception. The ventral pathway is claimed to support conscious experience (perception), whereas the dorsal pathway is claimed to support the control of movement (action). Others have argued that perception and action share much of their visual processing within the primate cortex. During visual search, the brain performs a sophisticated deployment of eye movements (saccadic actions) to gather information to subserve perceptual judgments. The relationship between the neural mechanisms mediating perception and action in visual search remains unexplored. Here, we investigate the visual representation of target information in the human brain, both for perceptual decisions and for saccadic actions during visual search. We use classification image analysis, a form of reverse correlation, to estimate the behavioral receptive fields of the visual mechanisms responsible for saccadic and perceptual responses during the same visual search task. Results show that the behavioral receptive fields mediating the perceptual decisions are indistinguishable from those driving the oculomotor decisions, suggesting that similar neural mechanisms are responsible for both perception and oculomotor action during search. Diverging target representations would result in an inefficient coupling between eye movement planning and perceptual judgments. Thus, a common target representation would be more optimal and might be expected to have evolved through natural selection in the neural systems responsible for visual search.

show abstract

Spatiotemporal mechanisms for detecting and identifying image features in human vision

Cited by 134 publications

References 28 publications

Visual orienting in dynamic broadband (1/f) noise sequences

Visual orienting in dynamic broadband (1/f) noise sequences

Weighted parallel contributions of binocular correlation and match signals to conscious perception of depth

Similar Neural Representations of the Target for Saccades and Perception during Search

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