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Transcript
The activity of functionally distinct parietal motor neurons varies with the purpose of a grasping action. (Modified, with permission, from Fogassi et al. 2005.) A. Apparatus and protocol for the experiment. A monkey is trained to press a button (start position) and reach and grasp a piece of food (1) either to bring it to the mouth (2a) or to place it into a container (2b). In the first condition the monkey eats the food brought to the mouth, whereas in the second it receives a food reward after the correct response. B. Activity ofSource: three neurons in the inferior parietal cortexand during the twoCortex, actions. Cell 1 discharges strongly Voluntary Movement: The Parietal Premotor Principles of Neural more Science, Fifth when Editonthe monkey grasps the food to eat it than when it Citation: grasps the food simply to move it. The behavior of cell 2 is the opposite. Cell 3 shows no difference between the two Fifth actions. Raster plots and Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Editon; 2012 Available histograms are aligned with the moment when the monkey touches the object to be grasped. Orange tics indicate when the monkey releases its hand from at: http://mhmedical.com/ Accessed: May 15, 2017 the button at Copyright the starting green tics Education. indicate when the hand touches the container. © position; 2017 McGraw-Hill All rights reserved