Biomaterial Database

Reaction times to chromatic stimuli. 1985

T Ueno, and J Pokorny, and V C Smith

The relative contributions of chromatic and achromatic activity to reaction time were investigated under conditions in which spatial and temporal transients were manipulated. Simple reaction times (RT) were obtained to eight photometrically matched (1 cd/m2) wavelengths between 448 and 658 nm. These stimuli were incrementally presented on a spatially coextensive 1.2 degrees white adapting field. RT was wavelength dependent for 5 or 10 cd/m2 steady backgrounds or a 5 Hz 1.2 cd/m2 flickering background. RT varied as a trichromatic saturation-like function (slowest RT at 572 nm). In comparison, RT was wavelength independent when no adapting field was present and when the 1.2 cd/m2 field was flickered at 15 Hz.

UI	MeSH Term	Description	Entries
D011930	Reaction Time	The time from the onset of a stimulus until a response is observed.	Response Latency,Response Speed,Response Time,Latency, Response,Reaction Times,Response Latencies,Response Times,Speed, Response,Speeds, Response
D003118	Color Perception	Mental processing of chromatic signals (COLOR VISION) from the eye by the VISUAL CORTEX where they are converted into symbolic representations. Color perception involves numerous neurons, and is influenced not only by the distribution of wavelengths from the viewed object, but also by its background color and brightness contrast at its boundary.	Color Perceptions,Perception, Color,Perceptions, Color
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000221	Adaptation, Ocular	The adjustment of the eye to variations in the intensity of light. Light adaptation is the adjustment of the eye when the light threshold is increased; DARK ADAPTATION when the light is greatly reduced. (From Cline et al., Dictionary of Visual Science, 4th ed)	Light Adaptation,Adaptation, Light,Adaptations, Light,Adaptations, Ocular,Light Adaptations,Ocular Adaptation,Ocular Adaptations
D013053	Spectrophotometry	The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.