Resumen de Postimagen visual y percepción espacial

Mariano Aguilar Rico, J.C. Soriano

• español

  Se ha probado con seis observadores que el tamaöo aparente de las postimågenes visuales en la oscuridad, coincide con el tamaöo de la proyecci6n de dichas imégenes en una pantalla separada del observador, distancias pråximas al metro. Esta coincidencia indica que con la sola informaci6n de la imagen visual, nosotros localizamos el objeto a un metro de distancia.

• English

  The apparent size of the visual afterimage mentally projected upon a screen is a function of the distance to the surface upon which it is "projected" (Emmert, 1881) (1). In complete darkness and without an actual screen, we can also observe changes in the apparent size of the afterimage. With head or arm movements we can imagine that the distance at which the afterimage is projected is changed, causing the perceived size of the afterimage to change. (Gregory et al., 1959).

  We are in agreement with Gregory et al. (2) who, referring to the classic experiment by Holway & Boring (1941) suggested that the variation in the size of the afterimage with respect to its localization distance (the projection on a real or imaginary screen) may be related to the phenomenon of size constancy in the object space.