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References in periodicals archive ?
The flicker fusion frequency was determined by comparing the power spectrum of the averaged response at each stimulus frequency (signal) to the power spectrum of a neighboring frequency (noise) and was defined as the frequency at which the power of the signal fell below the power of the noise.
Differences in the mean flicker fusion frequency data collected during the day and night were tested with paired-t tests (SigmaStat 3.1, Systat Software, San Jose, CA) because they represented "before-and-after" trials on the same animal.
There was also no detectable influence of rapid decompression on flicker fusion frequency for black rockfish, nor an apparent effect of exposure to bright light on the flicker fusion frequency of Pacific halibut.
The low flicker fusion frequency and high light sensitivity of Pacific halibut are characteristics of a visual system adapted to function at low light levels (Warrant, 1999).
However, a more recent study (Ostberg, Shahnavaz, & Stenberg, 1987) showed no difference in flicker fusion frequency for the different field scan directions.
This was as expected, given the well-documented increase in flicker fusion frequency with stimulus luminance under comparable conditions (see the review by Le Grand, 1968, pp.
An obvious threshold to investigate was the field scan frequency at which flicker could no longer be perceived, usually referred to as the flicker fusion frequency (FFF).
Likewise, maximum critical flicker fusion frequency (CFF) increased with an increase in temperature, having a [Q.sub.10] of 1.92 (Fig.
Abbreviations: CFF, critical flicker fusion frequency; ERG, electroretinogram; UV, ultraviolet.
Maximum critical flicker fusion frequency (CFF) is defined as the point at which further increases in irradiance do not result in a faster flicker fusion frequency.
The critical flicker fusion frequency measured via the extracellular electroretinogram is dependent on a variety of factors, namely adaptational state, background intensity, stimulus intensity, and the subtended visual angle of the source.
A previous study by Moeller and Case (1995) reports a critical flicker fusion frequency of 12 Hz for Oplophorus spinosus, which has a depth distribution similar to that of O.