Contents

26 September 1986
Vol 233, Issue 4771

About The Cover

Cover image expansion

Coding of different movement directions by a population of neurons in the motor cortex. Weighted vectorial contributions of individual cells (light purple lines) sum to yield a population vector (orange) which is congruent with the direction of movement (yellow). See page 1416. [The plot was produced using the Interactive Graphics Facility, Department of Biophysics, Johns Hopkins University, School of Medicine, Baltimore, MD 21205]