Visual tracking and neuron activity in the post-arcuate area in monkeys.
1. A visual tracking task from a predetermined zone to another predetermined zone with use of a hand was trained in 3 macaque monkeys. They rotated the handle at the wrist joint by flexing or extending. A total of 88 neurons in the posterior bank of the arcuate sulcus, contralateral to the hand used, was related to the task. These neurons were designated as (post-arcuate-) FB neurons, following von Bonin and Bailey's terminology. 2. The FB neurons were classified into 4 types according to their discharge patterns during the task; (1) non-reciprocally, visually coupled neurons (6 neurons); (2) non-reciprocally movement-coupled neurons (41 neurons); (3) reciprocally movement-coupled neurons (17 flexion type and 8 extension type); and (4) finally, non reciprocally movement-coupled depression type neurons (15 neurons). These activations started before the movement onset, as detected in the displacement trace, and were not correlated to the EOG. 3. A possible functional significance of these neurons was discussed. A suggestion was made that in the FB area, after receiving the visual cue information, a function for the later movement direction and tis initiation are produced and sent to the motor apparatus within the brain so that effective tracking task can be performed.
D000818:Animals; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D000882:Haplorhini; D007031:Hypothalamus / Q000502:physiology; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement; D009119:Muscle Contraction; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology; D014953:Wrist / Q000294:innervation / Q000502:physiology