On January 9th, the research team of Zhang Mingsha of the Institute of Neurology, Shanghai Academy of Biosciences published the research results in the Journal of Neuroscience titled "Post-parietal cortical nerve activity regulating the production of rapid eye movements". On the extracellular single electrode recording, the research team studied the role of the posterior parietal cortex in the process of rapid eye movement.
Through rapid eye movements, primates can quickly turn their eyeballs to objects that need attention, and therefore play a vital role in their survival. Normally, primates make about 3 rapid eye movements per second. In addition, when REM is pointing to an already expected position, part of REM can occur within a very short reaction time (SRT). This part of the REM is called rapid REM.
In order to study the neural mechanism of rapid and rapid eye movements, the Zhang Mingsha group recorded one of the brain regions of the posterior parietal cortex of the rhesus monkey-the lateral parietal groove (LIP) of the posterior parietal cortex in the gap task Nerve electrical activity. The interval eye movement task is a special kind of eye movement task. In this task, the eye movement target does not appear at the same time as the gaze point disappears, but only after the gaze point disappears for a period of time.
The researchers found that about 50% of the recorded neurons increased their electrical activity during the interval period compared to the non-interval eye movement task. The researchers believe that this increase in electrical activity that occurs before the eye movement target may represent some kind of preparation mechanism, and may be related to the rapid increase in the rate of rapid and rapid eye movements in interval eye movement tasks. In addition, a part of the brain area will produce continuously discharged neurons during the memory period. The electrical activity during rapid rapid eye movement is higher than that during normal rapid eye movement, and this increase in electrical activity from the eye The gaze point begins, and continues until the target point appears. This increase in electrical activity is spatially selective and limited to the receptive field of the neuron. However, the visual neurons in this brain area did not show the difference in electrical activity between rapid rapid eye movement and ordinary rapid eye movement. The results of these studies indicate that this increased preparatory activity should play a crucial role in determining the occurrence of rapid and rapid eye movements.
For the first time, the Zhang Mingsha group provided direct electrophysiological evidence that neurons in the parietal cortex have different activities during rapid and rapid eye movements. This study supports the hypothesis of the posterior parietal lobe pathway. In this hypothesis, the researchers concluded that the posterior parietal cortex is involved in the production of rapid and rapid eye movements.
The research was completed by graduate students Chen Mo, Liu Yu and collaborator Wei Linyu under the guidance of Professor Zhang Mingsha. The research work was funded by the Chinese Academy of Sciences' "Hundred Talents Program", the Ministry of Science and Technology 973 Program and the "Pujiang Talents" Program.
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