Spatial coordinates and phenomenology in the two-visual systems model

By Pierre Jacob & Frédérique de Vignemont.

In  N. Gangopadhyay, M. Madary, and F. Spicer (Eds.), Perception, Action and Consciousness (pp. 125-144). Oxford University Press.

Abstract: The ‘two-visual’ systems hypothesis has recently come under attack regarding its proposed functional dichotomy between vision-for-action and vision-for-perception as well as for the limited interaction it allows between visual awareness and processing in the dorsal stream. Schenk (2006) questions the rigid functional dichotomy between vision-forperception and vision-for-action, arguing that the dual model of vision is best accounted for in terms of a dissociation between egocentric and allocentric spatial coordinate systems. Wallhagen (2007) argues that there is no evidence to claim that the processing in the dorsal stream cannot underlie visual awareness. This chapter offers a response to both challenges and disentangles the contribution of two separable factors to the twovisual systems model, namely, how spatial information is coded and the relation between consciousness and processing in the ventral and dorsal streams respectively.