Dynamics of adaptation to contrast.
Perception
; 11(5): 505-28, 1982.
Article
em En
| MEDLINE
| ID: mdl-7186106
ABSTRACT
An investigation has been made into the temporal parameters with which the detection threshold for a sinusoidal grating changes during and after adaptation to the same grating at high contrast. Stationary high-spatial-frequency gratings and a phase-reversing low-spatial-frequency grating have been studied separately. It was found that the threshold continues to rise during adaptation for at least 6 min without sign of levelling off, and that full recovery from 6 min of adaptation can take more than 45 min. Intermittent adaptation and continuous adaptation for the same period produce similar effects. Single-phase and dual-phase exponential fits to the data are rejected, and it is concluded that the level of adaptation of the visual system to spatial contrast changes as a power function of time. However, recovery is not always monotonic, especially after adaptation to phase-reversing gratings. This may be due to inhibitory interactions between channels (in particular, those for pattern and movement information).
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Base de dados:
MEDLINE
Assunto principal:
Reconhecimento Visual de Modelos
/
Adaptação Ocular
/
Percepção de Forma
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Perception
Ano de publicação:
1982
Tipo de documento:
Article