Testing a computational model of light-adaptation dynamics.
Experiments from the periodic and aperiodic traditions were used to guide the development of a quantitatively valid model of light adaptation dynamics. Temporal contrast sensitivity data were collected over a range of 3 log units of mean luminance for sinusoids of 2 to 50 Hz. Probe thresholds on flashed backgrounds were collected over a range of stimulus-onset asynchronies and background intensities from 0.1 to 1000 td. All experiments were performed foveally in the photopic range and used a consistent stimulus paradigm and psychophysical method. The resulting model represents a merging of elements from both traditions, and consists of a frequency-dependent front-end followed by a subtractive process and static nonlinearity.
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139, USA.
T E
TE
von Wiegand
D C
DC
Hood
N
N
Graham
D000221:Adaptation, Ocular / Q000502:physiology*; D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology; D005425:Flicker Fusion / Q000502:physiology; D006801:Humans; D008027:Light; D008433:Mathematics; D008954:Models, Biological; D011601:Psychophysics; D012684:Sensory Thresholds / Q000502:physiology; D013053:Spectrophotometry; D013997:Time Factors