title: Dynamics of population coding for object views following object discrimination training.
abstract: We have previously demonstrated that inferotemporal neurons respond to objects viewed from a range of angles, even without any prior experience in learning the associations among the views. Several models have been proposed to explain object recognition across disparate views. However, direct neuronal evidence is rare. In the present study, we focused on the response similarity of a population of inferotemporal cells to object views, following different prior experiences. Two monkeys were subjected to a task in which object discrimination across views was required. We found significantly higher neural response similarity to 30° separated views, 190ms after object image presentation, than without any prior discrimination experience across views. The time period over which the similarity was significant began and endured similarly for 60° separated views at 190-850ms. For 90° separated views, the time period over which the similarity was significant was shorter and started later, at 230-550ms. The results demonstrate the dynamics of cell population activity and suggest a possible explanation for object recognition across disparate views.
authors.affiliation: Department of Information Science and Biomedical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan.
authors.forename: Reona
authors.initials: R
authors.lastname: Yamaguchi
authors.affiliation: Department of Information Science and Biomedical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan.
authors.forename: Jun-Ya
authors.initials: JY
authors.lastname: Okamura
authors.affiliation: Department of Information Science and Biomedical Engineering, Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065, Japan; Laboratory for Cognitive Neuroscience, Weifang Medical University, Shandong, China. Electronic address: gwang@ibe.kagoshima-u.ac.jp.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
mesh_terms: D000200:Action Potentials; D000818:Animals; D004192:Discrimination, Psychological / Q000502:physiology*; D007858:Learning / Q000502:physiology*; D008253:Macaca mulatta; D008297:Male; D008839:Microelectrodes; D009474:Neurons / Q000502:physiology*; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D013702:Temporal Lobe / Q000502:physiology*; D013997:Time Factors
keywords: monkey inferotemporal cortex; object recognition; population coding; view invariance