Fig. 2.

Example vector correlations. A–D: idealized scalar response fields (color maps) with corresponding vector fields superimposed. Data are plotted as a function of starting hand position and target position (in degrees of visual angle). For the scalar fields, lighter colors represent higher firing rates. Corresponding vector fields converge toward the highest response. ρ, θ, and β represent the vector correlation coefficient, phase angle, and scale factor, respectively, obtained by correlating the vector field in A with those in B–D.