Illustrating Monkey Arm Movements (image) The Hebrew University of Jerusalem Caption Neural activity in the premotor cortex carries information about reaching and grasping. Information can be obtained from local field potentials (top left, blue signal), spikes or individual neuronal action potentials (green), and multi-unit activity (red), measuring the activity of populations of neurons. The most accurate information is obtained by combining multi-unit activity from multiple electrodes, depicted by the red-colored shadow hand of the monkey. Credit Sandrine Alon Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.