cross-modal object recognition is viewpoint-independent对象识别是viewpoint-independent跨通道.pdf

Cross-Modal Object Recognition Is Viewpoint- Independent 1 1 1,2,3,4 Simon Lacey , Andrew Peters , K. Sathian * 1 Department of Neurology, Emory University, Atlanta, Georgia, United States of America, 2 Department of Rehabilitation Medicine, Emory University, Atlanta, Georgia, United States of America, 3 Department of Psychology, Emory University, Atlanta, Georgia, United States of America, 4 Atlanta Veterans Affairs Medical Center, Rehabilitation Research and Development Center of Excellence, Decatur, Georgia, United States of America Background. Previous research suggests that visual and haptic object recognition are viewpoint-dependent both within- and cross-modally. However, this conclusion may not be generally valid as it was reached using objects oriented along their extended y-axis, resulting in differential surface processing in vision and touch. In the present study, we removed this differential by presenting objects along the z-axis, thus making all object surfaces more equally available to vision and touch. Methodology/Principal Findings. Participants studied previously unfamiliar objects, in groups of four, using either vision or touch. Subsequently, they performed a four-alternative forced-choice object identification task with the studied objects presented in both unrotated and rotated (180u about the x-, y-, and z-axes) orientations. Rotation impaired within-modal recognition accuracy in both vision and touch, but not cross-modal recognition accuracy. Within-modally, visual recognition accuracy was reduced by rotation about the x- and y-axes more than the z-axis, whilst haptic recognition was equally affected by rotation about all three axes. Cross-modal (but not within-modal) accuracy correlated with spatial (but not object) imagery scores. Conclusions/Significance. The viewpoint-independence of