Abstract
Humans have the ability to recognize objects regardless of the viewing angle. Event-related potential (ERP) was introduced in this study to measure the electrophysiological activity underlying view-invariant object recognition. Two tasks were modified based on a delayed matching-to-sample task. One was an object recognition task, in which subjects had to recognize the same 3D object appearing as a sample regardless of the viewing angle. The other, as a control, was an image identification task, in which the same images as used in the object recognition task were used and the subjects had to compare two images to judge if they were the same. In both of the tasks, a negative component at around 150 ms, N1, after the onset of the test image was observed at the electrodes on the surface of the occipito-parieto-temporal cortex. When the tasks were compared, no significant difference in the N1 peak was found between them at beginning, but they became significantly different after extensive training in view-invariant object recognition. Modulation was observed at almost all of the occipitoparieto-temporal electrodes. These results demonstrate that the posterior N1 is sensitive to view-variant object recognition.
