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- W2034229257 abstract "Abstract A theory of visual threshold-versus-intensity curves is presented. The theory is based on a model of spike generation by idealized visual neurons. The spike generation model relates the interarrival time statistics of the neural spikes to the statistics of weighted photon summation within the receptive field of the spiking neuron. The spike generation model is combined with the psychophysical assumption that the observer monitors a neuron which is ideally matched to the target in both scale and location. The resulting model specifies how the interarrival time distribution depends on the incremental flash intensity, area, and duration of the threshold stimulus and on the background luminance. A further psychophysical assumption is then added to the model: that the observer uses a neural timing model in order to discriminate test trials from blanks. On the basis of the complete model, a theory of threshold-versus-intensity functions is derived. The model observer exhibits threshold behavior that mimics many aspects of the threshold judgments of human observers. In particular, the theoretical threshold functions exhibit: (1) at low background levels, absolute thresholds which depend inversely on test area and duration; (2) at moderate background levels, de Vries–Rose behavior if and only if the test flash is sufficiently small and brief; and (3) in the limit of high background levels, asymptotic Weber behavior. The theory also accounts for changes in the shape of the threshold-versus-intensity curve as test flash area (or spatial frequency) and duration are altered. It is argued that empirical failures to find Weber behavior at high backgrounds under some stimulus conditions (high spatial frequency or small targets, brief targets) may be due to the occurrence of photoreceptor saturation at background levels that are below the range in which Weber behavior would be predicted by the (nonsaturating) model presented here." @default.
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- W2034229257 date "1996-03-01" @default.
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- W2034229257 title "A Neural Timing Model of Visual Threshold" @default.
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- W2034229257 doi "https://doi.org/10.1006/jmps.1996.0001" @default.
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