Neural adaptation for novel objects during dynamic articulation.
Human observers readily identify objects with moving parts, and recognize their underlying structure even when the component parts undergo complex movement. This suggests the existence of neural representations that are invariant to motion and state of articulation, which together allow our visual system to maintain 'object constancy'. Ventral temporal cortex has previously been implicated in object perception and in coding object identity, but it is unclear where this is achieved when objects undergo motion-driven shape changes. In the present study, we use fMRI adaptation to probe the neural response properties when subjects view dynamic novel objects. Our results reveal neural selectivity for novel objects in the LOC region of the occipito-temporal lobe, even when those objects are viewed as moving and articulating. We also identify a bilateral area of posterior fusiform outside of the LOC with neural populations invariant to changes in the articulatory state of an object, a critical feature of object constancy. These results demonstrate the functional importance of ventral temporal cortex in the perception of moving objects, and the existence of neural populations coding for object constancy across movement and articulation.
Pyles
John A
JA
Center for Cognitive Neuroscience & Department of Cognitive Sciences, University of California, Irvine, California 92697-5100, United States. jpyles@uci.edu
Grossman
Emily D
ED
D000222:Adaptation, Physiological; D001931:Brain Mapping; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009068:Movement; D009778:Occipital Lobe / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011930:Reaction Time; D013702:Temporal Lobe / Q000502:physiology*