Journal ArticleDOI
Visual Responses to Time-Dependent Stimuli.* II. Single-Channel Model of the Photopic Visual System
TLDR
A relatively simple model of the first two links in the visual receptor system is proposed in order to explain the data reported in Part I on amplitude sensitivity to sinusoidally flickering stimuli at photopic adaptation levels of white light.Abstract:
A relatively simple model of the first two links in the visual receptor system is proposed in order to explain the data reported in Part I on amplitude sensitivity to sinusoidally flickering stimuli at photopic adaptation levels of white light [ J Opt Soc Am51, 422 ( 1960)] The model consists of a linear filtering stage followed by a nonlinear pulse-encoding stage The first stage is regarded as essentially “noiseless” at photopic levels; amplitude thresholds are treated as thresholds for the transmission of variable intervals between pulses With the aid of the model, suprathreshold responses can be inferred from the measured threshold behavior In this way, transient responses comparable with various other psychophysical, neural, and electroretinographic data are predicted; the resulting agreement is considered fairly good in view of the parsimony of the proposed modelread more
Citations
More filters
Journal ArticleDOI
Probability summation over time.
TL;DR: Frequency-of-seeing and sensitivity-duration curves were collected for temporal signals of limited spectral extent and suggest that a stimulus is detected whenever the excursions of its linearly filtered, noise-perturbed temporal waveform exceed some fixed magnitude.
Journal ArticleDOI
Frequency Doubling in Visual Responses
TL;DR: The frequency-doubling effect is the result of neural mechanisms which are more central than the locus of flicker fusion, and can be explained by assuming that there is a second filtering operation which follows the nonlinear response of the visual system, rather than preceding it.
Journal ArticleDOI
A neurophysiologically-based mathematical model of flash visual evoked potentials
TL;DR: Evidence is presented that a neurophysiologically-inspired mathematical model, originally developed for the generation of spontaneous EEG activity, can produce VEP (visual evoked potential)-like waveforms when pulse-like signals serve as input, and it was found that the simulated VEP activity was mainly due to intracortical excitatory connections rather than direct thalamic input.
Journal ArticleDOI
Theory of Flicker and Transient Responses, I. Uniform Fields*
TL;DR: Photopic flicker data are explained in terms of a theoretical model of two retinal processes: a linear diffusion process (presumably in the receptors), and a nonlinear inhibiting network that adaptively controls the sensitivity and time constants of the model.
Journal ArticleDOI
Temporal Summation of Positive and Negative Flashes in the Visual System
TL;DR: The introduction of a negative test stimulus into the double-flash, increment-threshold technique is a new aspect of the present work and some new phenomena are observed, particularly, that a positive and a negative flash summate with each other at the interval where double positive or double negative flashes yield inhibition.
References
More filters
Journal ArticleDOI
Research into the dynamic nature of the human fovea-cortex systems with intermittent and modulated light. I. Attenuation characteristics with white and colored light.
TL;DR: In this article, the authors investigated the shape of the attenuation characteristics obtained with the experiments and calculated from investigations of other authors, and showed that the existing theories on flicker fusion provide no explanation for the shape.
Journal ArticleDOI
Visual response to time-dependent stimuli. I. Amplitude sensitivity measurements.
TL;DR: Classic relationships as the Ferry-Porter, Talbot-Plateau, and Weber-Fechner laws are derivable from the present results, as descriptions of the behavior of certain parts of the amplitude sensitivity curves as functions of adaptation level.
Journal ArticleDOI
The limiting information capacity of a neuronal link
TL;DR: It is concluded, not that interval modulation rather than binary modulation “ought” to be the mode of action of the central nervous system, but that the contrary assumption is unsupported by considerations of efficiency.
Journal ArticleDOI
On responses in the human visual system as a function of adaptation level.
TL;DR: Thresholds are determined at various short times before and after the onset of a 38-mL conditioning stimulus in the dark-adapted eye, and following six other levels of pre-adaptation.
Related Papers (5)
Model for visual luminance discrimination and flicker detection.
George Sperling,Man Mohan Sondhi +1 more