Preserved Haptic Shape Processing after Bilateral LOC Lesions

Behavioral / Cognitive Preserved Haptic Shape Processing after Bilateral LOC

Haptic Shape Processing in Visual Cortex

Humans typically rely upon vision to identify object shape, but we can also recognize shape via touch (haptics). Our haptic shape recognition ability raises an intriguing question: To what extent do visual cortical shape recognition mechanisms support haptic object recognition? We addressed this question using a haptic fMRI repetition design, which allowed us to identify neuronal populations se...

Perceptual dependence for shape and texture during haptic processing.

Perceptual dependence--the existence of perceptual interactions between the component dimensions of the same stimulus--was investigated for shape and texture during haptic processing. The haptic system combines tactual and kinesthetic information. Previous research has demonstrated that haptic exploration influences the extent to which object properties are integrated. Conditions designed to pr...

Parallel processing of shape and texture in haptic search.

In a haptic search task, one has to determine the presence of a target among distractors. It has been shown that if the target differs from the distractors in two properties, shape and texture, performance is better than in both single-property conditions (Van Polanen, Bergmann Tiest, & Kappers, 2013). The search for a smooth sphere among rough cubical distractors was faster than both the searc...

Analysis of pathways mediating preserved vision after striate cortex lesions.

This study investigated the neural substrates of preserved visual functioning in a patient with homonymous hemianopsia and Riddoch syndrome after a posterior cerebral artery stroke affecting the primary visual cortex (area V1). The limited visual abilities of this patient included above-chance verbal reports of movement and color change as well as discrimination of movement direction in the hem...