Results 221 to 230 of about 2,327 (266)

A comparison of two methods for assessing critical flicker fusion frequency in hens

open access: yesBehavioural Processes, 2009
This paper compared two general methods for assessing critical fusion frequency in hens (gallus gallus domesticus). The first method was a conditional discrimination procedure with the stimuli presented successively. The second was a two-alternative forced-choice procedure with the stimuli presented simultaneously.
T Mary Foster
exaly   +5 more sources

Critical flicker-fusion frequency in age-related macular degeneration

open access: yesGraefe's Archive for Clinical and Experimental Ophthalmology, 2010
To assess the influence of age-related macular degeneration (AMD) on critical flicker-fusion frequency (CFF).CFF was measured centrally for a red, green and blue target, and in 10 degrees excentricity with a red target. Twenty-eight patients with non-exsudative AMD, 12 patients with exsudative AMD and 45 age-matched healthy eyes were included.CFF ...
Mathias, Maier   +3 more
openaire   +3 more sources
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Stability of Adaptation of Critical Flicker Fusion Frequency to Intermittent Light

Nature, 1966
THE modification of critical flicker fusion frequency by intermittent light of varying frequency is unchanged by such physiological procedures as hyperventilation and rebreathing1, and by drugs2,3, which are known to alter mean critical flicker fusion frequency.
P Turner, D S Patterson
exaly   +3 more sources

Critical flicker fusion frequency of the river lamprey (Lampetra fluviatilis)

Vision Research, 1979
Abstract Enucleated eyes of the river lamprey ( Lampetra fluviatilis ) were investigated by flicker stimulation. The critical fusion frequencies (CFF's) of the ERG were determined at various intensities of the stimulating light. The relation between CFF and light intensity shows two phases. On the average, the shift between these two phases occurs at
KAJ Holmberg
exaly   +3 more sources

Using electroretinograms to assess flicker fusion frequency in domestic hens Gallus gallus domesticus

open access: yesVision Research, 2012
The assessment of flicker fusion frequency (FFF), the stimulus frequency at which a flickering light stimulus can no longer be resolved and appears continuous, and critical flicker fusion frequency (CFF; the highest frequency at any light intensity that ...
Thomas J Lisney   +2 more
exaly   +2 more sources

Behavioural assessment of flicker fusion frequency in chicken Gallus gallus domesticus

open access: yesVision Research, 2011
To interact with its visual environment, an organism needs to perceive objects in both space and time. High temporal resolution is hence important to the fitness of diurnally active animals, not least highly active aerial species such as birds.
Thomas J Lisney   +2 more
exaly   +2 more sources

Analysis of flicker fusion critical frequency by the iteration method

Human Physiology, 2006
Two methods of the presentation of light stimuli for determining the flicker fusion critical frequency were compared: the classic method using a continuous increase in flicker frequency and a new iteration method in which impulses of fixed duration were presented step by step.
V V, Rozhentsov   +2 more
openaire   +2 more sources

The modification of critical flicker fusion frequency by an adapting stimulus of flickering light

Vision Research, 1965
Abstract The critical flicker fusion frequency is elevated by adaptation to intermittent light of high frequency and depressed by intermittent light of lower frequency. This relationship is almost linear between adapting frequencies of 24 and 54 c/s.
openaire   +2 more sources

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