Position and Identity Information Available in fMRI Patterns of Activity in Human Visual Cortex.

摘要: Parietal cortex is often implicated in visual processing of actions. Action understanding essentially abstract, specific to the type or goal action, but greatly independent variations perceived position action. If certain parietal regions are involved action understanding, then we expect them show these generalization and selectivity properties. However, additional functions cortex, such as self-action control, may impose other demands by requiring an accurate representation location graspable objects. Therefore, dimensions along which responses modulated indicate functional role regions. Here, studied degree invariance hand/object specificity during viewing tool-grasping To that end, characterize information available about location, hand, tool identity patterns fMRI activation various cortical areas: early posterior intraparietal sulcus, anterior superior lobule, ventral object-specific lateral occipital complex. Our results suggest a gradient within human dorsal stream: posterior–anterior axis, gradually lost, whereas hand enhanced. This reflect gradual transformation input from initial retinotopic areas position-invariant viewed cortex. SIGNIFICANCE STATEMENT Since seminal study Goodale Milner (1992), there general agreement largely divided between stream specializing object recognition vision for respectively. address Specifically, manipulation pathways, characterizing object-grasping videos, appeared different retinal locations. We find converging evidence enhanced, leading