Investigating visuo-tactile recognition of unfamiliar moving objects: A combined behavioural and fMRI study
Jason Chan, T Aisling Whitaker, Cristina Simoes-Franklin, Hugh Garavan, Fiona N Newell
Poster
Last modified: 2008-05-13
Abstract
Previous research on haptic object recognition has focused mainly on static objects thus very little is understood about the role of dynamic information in haptic object recognition. In this study we examined if motion, particularly of dynamic object parts, is combined with shape information in the representation of an object in haptic processing. In our behavioural studies we found that target objects, previously learned as moving objects, were more easily recognized when presented dynamically, than when presented as static objects, even though, shape information alone was sufficient to recognize each object. Moreover, cross-modal, visuo-tactile object recognition was better for dynamic than static objects. We then explored, using fMRI, whether the same neural substrates underly the recognition of visual and haptic dynamic objects. Participants learned six shapes (3 static and 3 dynamic) through touch and another six (3 static and 3 dynamic) through vision. In the scanner, participants saw static greyscale images of the objects they had learned. We hypothesised that the moving objects previously learned would activate visual motion area compared to the learned static objects, across vision and touch. Our data shows that a wide array of brain areas are involved in this task, including area V5(MT).