Stimulus luminance and the spatial acuity of domestic fowl (Gallus g. domesticus).
Vision Res
; 49(23): 2747-53, 2009 Nov.
Article
en En
| MEDLINE
| ID: mdl-19683544
ABSTRACT
The luminance dependence of spatial acuity in domestic fowl was measured directly over stimulus luminances ranging from 0.06 to 57.35 cd m(-2). At the highest luminance, acuity was around 6.5 c deg(-1), in agreement with previous studies in this species. As stimulus luminance decreased, acuity fell with increasing rate to 3.2 c deg(-1) at 0.06 cd m(-2), following the same shape as acuity functions for other mammalian and avian species. These findings suggest that the rod-cone transition for domestic fowl is between 0.45 and 1.79 cd m(-2). Over the photopic range from 1.79 to 57.35 cd m(-2) the change of acuity for fowl was 1%, compared with 32% for humans. For domestic fowl, the Rovamo-Barten MTF model of contrast sensitivity accounted for the behaviour of acuity as a function of luminance down to mesopic levels.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Percepción Espacial
/
Iluminación
/
Sensibilidad de Contraste
/
Agudeza Visual
/
Pollos
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Vision Res
Año:
2009
Tipo del documento:
Article