Portal de Periódicos da CAPES

Perception-Action Dissociations of a Walkable Müller-Lyer Configuration

2000; SAGE Publishing; Volume: 11; Issue: 3 Linguagem: Inglês

10.1111/1467-9280.00248

1467-9280

Maryjane Wraga, Sarah H. Creem, Dennis R. Proffítt,

Visual perception and processing mechanisms

These studies examined the role of spatial encoding in inducing perception-action dissociations in visual illusions. Participants were shown a large-scale Müller-Lyer configuration with hoops as its tails. In Experiment 1, participants either made verbal estimates of the extent of the Müller-Lyer shaft (verbal task) or walked the extent without vision, in an offset path (blind-walking task). For both tasks, participants stood a small distance away from the configuration, to elicit object-relative encoding of the shaft with respect to its hoops. A similar illusion bias was found in the verbal and motoric tasks. In Experiment 2, participants stood at one endpoint of the shaft in order to elicit egocentric encoding of extent. Verbal judgments continued to exhibit the illusion bias, whereas blind-walking judgments did not. These findings underscore the importance of egocentric encoding in motor tasks for producing perception-action dissociations.