منابع مشابه
Intensity Discrimination in the Human Eye
1. A new apparatus is described for measuring visual intensity discrimination over a large range of intensities, with white light and with selected portions of the spectrum. With it measurements were made of the intensity DeltaI which is just perceptible when it is added for a short time to a portion of a field of intensity I to which the eye has been adapted. 2. For white and for all colors th...
متن کاملIntensity Discrimination in the Human Eye
New measurements of the brightness difference sensibility of the eye corroborate the data of previous workers which show that DeltaI/I decreases as I increases. Contrary to previous report, DeltaI/I does not normally increase again at high intensities, but instead decreases steadily, approaching a finite limiting value, which depends on the area of the test-field and on the brightness of the su...
متن کاملTiming of target discrimination in human frontal eye fields.
Frontal eye field (FEF) neurons discharge in response to behaviorally relevant stimuli that are potential targets for saccades. Distinct visual and motor processes have been dissociated in the FEF of macaque monkeys, but little is known about the visual processing capacity of FEF in humans. We used double-pulse transcranial magnetic stimulation [(d)TMS] to investigate the timing of target discr...
متن کاملIntensity discrimination in forward masking.
A nonmonotonic intensity discrimination function was recently reported in which a midlevel hump occurred for 25-ms sinusoidal standards ranging from 20 to 100 dB SPL and presented 100 ms after an intense narrow-band noise forward masker [F.-G. Zeng et al., Hear. Res. 55, 223-230 (1991)]. This paper provides additional data on how the midlevel hump is affected by three factors of forward masking...
متن کاملKnowing with Which Eye We See: Utrocular Discrimination and Eye-Specific Signals in Human Visual Cortex
Neurophysiological and behavioral reports converge to suggest that monocular neurons in the primary visual cortex are biased toward low spatial frequencies, while binocular neurons favor high spatial frequencies. Here we tested this hypothesis with functional magnetic resonance imaging (fMRI). Human participants viewed flickering gratings at one of two spatial frequencies presented to either th...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1938
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.22.1.7