Fig. 3. Frequencies of occurrence of particular head positions for the four dish conditions NOL, SL, UL and STR for the CLOSE reference point (measurement position nearest to the dish), combined for all individuals. The data are blocked into 5° bins (head angles) (see text for details). Analyses based on single scores for each individual are given in the text. See Fig. 1 legend for description of dish conditions. Bin, binocular (0°).