| Two experiments were performed to research the effects of visual field factor on pseudoneglect. Tachistoscopic and forced-choice methods were employed in experiment 1. The results replicated the crossover effect in landmark task as before, and manifested that greyscales have no crossover effect—the length factor have effect on the greyscales task as the landmark task, it only affects the bias magnitude, but not the error direction. Experiment 2 employed the greyscales task and tachistoscopic visual three-field technique to examine the effects of both visual field and hand used factors. The results indicated that the factor of hand used had no significant main effect, but the main effect of visual field was significant: when the greyscales were presented in the middle or right, pseudoneglect still manifested, but when in the left, pseudoneglect vanished. The results provided evidence supporting the hypothesis that the perceptual distortion derives from the attentional process. The authors modified the mathematical model of attentional predominance of right hemisphere proposed by Anderson(1996) and combined it with the size distortion theory to explain the pseudoneglect phenomena for the first time. |
