Fig. 1
From: Population coding of conditional probability distributions in dorsal premotor cortex
Experimental design and statistics. a If the arm is outstretched, the only possible arm movements are back toward the body (left). In other limb postures, it may be possible to move the arm in any direction (right). In blue, circular probability distributions are shown for the possible upcoming movements based on the current arm posture. b Experimental design. The monkey makes sequences of four reaches, briefly holding within each target box before the next target appears. c The current hand position limits the range of possible locations of the next target, due to the borders of the workspace and target presentation algorithm. d The probability distributions of upcoming reach directions (blue) from different areas of space (x and y divided into quartiles). Green arrows point toward the circular means of the distributions. e Φ is the angular difference between the upcoming movement vector (the vector that brings the hand to the target) and the current angular hand position (relative to the center of the workspace). f The probability distribution of Φ’s from all hand positions. g The probability distribution of Φ’s from initial hand positions within 2 cm of the center of the workspace
