Length Estimation of Evolving Lines: a Further Investigation
Lucia Tomat, Gb Vicario, Giulio Vidotto · 2001
Forty subjects were asked to evaluate the length in evolving horizontal lines. Evolving lines, presented for 750, 1500 and 3000 msec in the centre of a computer monitor, expanded symmetrically from the central point toward the two endpoints from 0 to 84 mm, or shrunk symmetrically from two endpoints toward the central point from 84 to 0 mm. Subjects fixate their gaze in the median point between the stimuli. A variant of the constant method was used. Results show that fixation of the gaze differentiates the evaluations of the expanding lines from the shrinking lines.