Behavioral task
This protocol is extracted from research article:
The somatosensory cortex receives information about motor output
Sci Adv, Jul 10, 2019; DOI: 10.1126/sciadv.aaw5388

Our basic methods for the behavioral task, surgery, and recording of neuronal and kinematics signals have been described previously (20, 39). Two monkeys were operantly conditioned to perform a reach-to-grasp task with the right hand (fig. S1A). Each monkey started a trial by putting its hand on a home button for a predetermined time (2 to 2.5 s). After receiving the cue, they reached for a joystick lever and pulled it to get a reward [time from movement onset: Monkey T, 342 ± 39 ms (mean ± SD, n = 3317 trials); Monkey C, 375 ± 47 ms (n = 934 trials)]. The targets were placed 25 and 20 cm apart from the starting point for Monkeys T and C, respectively. We recorded times for releasing the home button, pulling the lever, and pushing the home button. Monkey T performed the task for 24 sessions of 10 min each, in which they conducted 142.4 ± 7.4 (mean ± SD) trials per session. Among the 24 sessions, we recorded the neuronal activity in peripheral afferents, ECoG, EMG, and kinematics in 21 sessions and ECoG, EMG, and kinematics in 3 sessions. Monkey C performed the task for 40 sessions of 10 min each, in which 127.1 ± 15.9 (mean ± SD) trials were conducted per session. Among the 40 sessions, we recorded the neuronal activity in peripheral afferents, ECoG, EMG, and kinematics in 7 sessions. We recorded ECoG, EMG, and kinematics in 33 sessions but did not record times for pulling the lever in these sessions.

Monkey T made reaching movements to one of two target locations 18 cm apart from one another along the right-left axis of the body and grasped one of the objects, with three different shapes, in each session. Monkey C made reaching movements to one target location and grasped one object in each session during which we recorded the neuronal activity in peripheral afferents. In sessions where we recorded ECoG, EMG, and kinematics only, Monkey C made reaching movements to one target location (22 sessions), one of three locations (6 sessions), one of four locations (1 session), one of six locations (1 session), and variable locations (3 sessions) on the coronal plane in each trial.

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