Angular Distribution for Eye and Head Movements

Distribution of gaze shift angles during scene viewing. Indoor and outdoor scenes were viewed for ten seconds through gaze-contingent windows controlled by either the eye or the head. Windows could be Open (no window), Square (equal horizontal and vertical span), Horizontal (greater horizontal span), or Vertical (greater vertical span). Gaze shift angles were classified into 16 equal pi/8 bins, and the data indicate the proportion of shifts in each bin. In addition, angles were more broadly classified as horizontal (+/- 3pi/16 from the horizontal axis) or vertical (+/- 3pi/16 from the vertical axis), and the horizontal bias (H_bias) was calculated as the proportion of horizontal gaze shifts divided by the sum of horizontal and vertical shifts.