title: Contribution of color signals to ocular following responses.
abstract: Ocular following responses (OFRs) are elicited at ultra-short latencies (< 60 ms) by sudden movements of the visual scene. In this study, we investigated the roles of color signals in OFRs in monkeys. To make physiologically isoluminant sinusoidal color gratings, we estimated the physiologically isoluminant points using OFRs and found that the physiologically isoluminant points were nearly independent of the spatiotemporal frequency of the gratings. We recorded OFRs induced by the motion of physiologically isoluminant color gratings and found that OFRs elicited by the motion of color gratings had different spatiotemporal frequency tuning from those elicited by the motion of luminance gratings. Additionally, OFRs to isoluminant color gratings had smaller peak responses, suggesting that color signals weakly contribute to OFRs compared with luminance signals. OFRs to the motion of stimuli composed of luminance and color signals were also examined. We found that color signals largely contributed to OFRs under low luminance signals regardless of whether color signals moved in the same or opposite direction to luminance signals. These results provide evidence of the multichannel visual computations underlying motor responses. We conclude that, in everyday situations, color information contributes cooperatively with luminance information to the generation of ocular tracking behaviors.
authors: Department of Integrative Brain Science, Graduate School of Medicine, Kyoto University, Konoe-cho, Yoshida, Kyoto-shi, Kyoto, 606-8501, Japan.|Center for the Promotion of Interdisciplinary Education and Research, Research and Educational Unit of Leaders for Integrated Medical System, Kyoto University, Kyoto, Japan.
authors: Kiyoto
authors: K
authors: Matsuura
authors: Department of Integrative Brain Science, Graduate School of Medicine, Kyoto University, Konoe-cho, Yoshida, Kyoto-shi, Kyoto, 606-8501, Japan.|Center for the Promotion of Interdisciplinary Education and Research, Research and Educational Unit of Leaders for Integrated Medical System, Kyoto University, Kyoto, Japan.
authors: Kenji
authors: K
authors: Kawano
authors: Department of Physiology, Systems Neuroscience Laboratory, Graduate School of Medicine, Hokkaido University, Hokkaido, Japan.
authors: Naoko
authors: N
authors: Inaba
authors: Department of Integrative Brain Science, Graduate School of Medicine, Kyoto University, Konoe-cho, Yoshida, Kyoto-shi, Kyoto, 606-8501, Japan. kmiura@brain.med.kyoto-u.ac.jp.
authors: Kenichiro
authors: K
authors: Miura
mesh_terms: D003118:Color Perception / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D009799:Ocular Physiological Phenomena; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics / Q000379:methods
keywords: color motion; eye movement; isoluminant point; monkey; spatiotemporal frequency