TY - JOUR T1 - Parietal Cortex Integrates Visual and Oculomotor Signals to Update Grasp Plans JF - bioRxiv DO - 10.1101/758532 SP - 758532 AU - Bianca R. Baltaretu AU - Simona Monaco AU - Jena Velji-Ibrahim AU - Gaelle N. Luabeya AU - J. Douglas Crawford Y1 - 2019/01/01 UR - http://biorxiv.org/content/early/2019/09/11/758532.abstract N2 - Posterior parietal cortex participates in the spatial updating of reach goals during rapid eye movements (saccades), but the neural mechanisms for updating grasp orientation are unknown. Based on the role of the supramarginal gyrus (SMG) in transsaccadic perception, we hypothesized that it might also play a role in updating grasp plans. To test this, we employed a functional magnetic resonance imaging (fMRI) paradigm, where saccades sometimes interrupted preparation of a grasp toward an unpredictably oriented object. Right SMG and several parietal grasp areas (e.g., intraparietal/superior parietal cortex) were specifically modulated by transsaccadic changes in object orientation. Finally, a psychophysiological interaction analysis suggested that SMG interacted with both saccade-related cortical inputs and grasp outputs to dynamically update grasp plans during saccades. These data implicate SMG as a key module for updating object orientation for perception and action, and show how it interacts with sensorimotor areas to update grasp. ER -