Recognizing objects regardless of viewing angles enlarges the difference across the ERP component N1 amplitudes evoked by the objects.

Even if viewed from different angles, one can identify an object from similar distractors after learning. To investigate the changes in neuronal activity accompanying to the object recognition learning, human subjects were asked to train themselves with novel objects in a task, in which the images of an object had to be discriminated from images of other objects regardless of the viewpoint. EEGs were recorded at the beginning of the task and after extensive training. Comparison of the ERP component - N1, the first early negative peak at posterior electrodes, showed a significant increase in the variation of N1 amplitude over objects during the learning process. The variation across views decreased. It suggests, at least at the level of N1, that the neuronal network responding to different views of the same object share largely after training, whereas before training it was based on the stimulus image similarity. [ABSTRACT FROM AUTHOR]