Similarities between the awareness of change in vision and touch: The role of spatial processing
Alberto Gallace, Charles Spence
Symposium Talk
Last modified: 2008-05-13
Abstract
Studies of change detection have revealed that people are surprisingly poor at detecting changes between two consecutively presented visual scenes/displays, under various stimulus presentation conditions (as, for example, when the two to-be-compared displays are separated by a blank or mask, or by a saccade). More recently, this phenomenon, known as ‘change blindness’, has been reported within touch as well. In the studies reported here, the ability of participants to detect changes between two consecutively-presented vibrotactile patterns presented on the fingertips of both hands or across the body surface were investigated. Not only was change detection impaired when a tactile mask was introduced between the two to-be-compared displays, but also when a visual mask was used instead. Similarly, failures of change detection were reported when the two to-be-compared displays were presented in different sensory modalities (vision and touch; i.e., crossmodal change blindness was observed). Finally, we also show that tactile change detection can be also impaired by the execution of a bodily movement during the presentation of the two to-be-compared displays. Taken as a whole, these results show that spatial information processing might play a critical role in people’s awareness of both visual and tactile change.