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Correlations between Visual Temporal Resolution and Individual Alpha Peak Frequency: Evidence that Internal and Measurement Noise Drive Null Findings.
J Cogn Neurosci
April 2024
New York University Abu Dhabi, United Arab Emirates.
The brain organizes the continuous flow of sensory input by parsing it into discrete events. In the case of two flashes separated by a brief ISI, for example, perception may be of a single flash or two distinct flashes, depending on the ISI but also on the speed of processing. A number of studies have reported evidence that participants with a higher EEG peak alpha frequency are able to detect the presence of two flashes separated by short intervals, whereas those with slower alpha report only one flash.
View Article and Find Full Text PDFIndividual alpha frequency increases during a task but is unchanged by alpha-band flicker.
Psychophysiology
February 2020
Program in Psychology, The Graduate Center, The City University of New York, New York, New York.
Visual perception fluctuates in sync with ongoing neural oscillations in the delta, theta, and alpha frequency bands of the human EEG. Supporting the relationship between alpha and perceptual sampling, recent work has demonstrated that variations in individual alpha frequency (IAF) correlate with the ability to discriminate one from two stimuli presented briefly in the same location. Other studies have found that, after being presented with a flickering stimulus at alpha frequencies, perception of near-threshold stimuli fluctuates for a short time at the same frequency.
View Article and Find Full Text PDFThe Speed of Alpha-Band Oscillations Predicts the Temporal Resolution of Visual Perception.
Curr Biol
November 2015
Department of Psychology, University of Wisconsin-Madison, Madison, WI 53703, USA; Department of Psychiatry, University of Wisconsin-Madison, Madison, WI 53703, USA.
Evidence suggests that scalp-recorded occipital alpha-band (8-13 Hz) oscillations reflect phasic information transfer in thalamocortical neurons projecting from lateral geniculate nucleus to visual cortex. In animals, the phase of ongoing alpha oscillations has been shown to modulate stimulus discrimination and neuronal spiking. Human research has shown that alpha phase predicts visual perception of near-threshold stimuli and subsequent neural activity and that the frequency of these oscillations predicts reaction times, as well as the maximum temporal interval necessary for perceived simultaneity.
View Article and Find Full Text PDFTransient spatial attention degrades temporal resolution.
Psychol Sci
May 2003
Department of Psychology, University of Haifa, Haifa, Israel.
To better understand the interplay between the temporal and spatial components of visual perception, we studied the effects of transient spatial attention on temporal resolution. Given that spatial attention sharpens spatial resolution, can it also affect temporal resolution? To assess temporal resolution, we measured the two-flash fusion threshold When two flashes of light are presented successively to the same location, the two-flash fusion threshold is the minimal interval between the flashes at which they are still perceived as two flashes, rather than a single flash. This assessment of temporal resolution was combined with peripheral precuing--a direct manipulation of transient spatial attention.
View Article and Find Full Text PDFIs human motion detection subserved by a single or multiple channel mechanism?
Vision Res
January 1998
McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
Two recent versions of a single channel model of motion perception have had impressive success in explaining direction discrimination by human observers for spatially filtered noise images in two-flash apparent motion. It has been argued that the dramatic breakdown in motion perception which occurs when one image in the two-flash sequence is low-pass filtered can be explained only by a single channel model. We show that neither version of the single channel model which has been proposed can explain performance for noise images chosen to provide comparable stimulation in the spatial channels known to subserve human vision.
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