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Figure 1 | BMC Neuroscience

Figure 1

From: Learning course adjustments during arm movements with reversed sensitivity derivatives

Figure 1

Subjects bent a joystick to move a cursor to a target. (a) In each trial, the target appeared at a random location. (b) The subject then moved the cursor, though often they didn't manage to move it exactly along a straight line to the target. During the cursor motion, the target jumped, at an unpredictable time, at right angles to the line from cursor to target. Jump size and direction were random. (c) If subjects got to the target and stayed there for 100 ms then they were rewarded with a flash and beep. (d) In control trials, pushing the joystick forward moved the cursor up, and pushing right moved it right (e) In Experiment 1, pushing the joystick forward moved the cursor down, and pushing right moved it left, i.e. cursor motion was reversed in both dimensions, flipping the signs of all components of ∂e/∂u. (f) In Experiment 2, the relation between joystick and cursor was more complex: reflected vertically through the midline and rotated 30 degrees counterclockwise.

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