P/PS/32. Perceptual processes in line bisection performance

The study presents an experiment carried out to discover the influence of perceptual factors on line bisection performance. A total of 392 mixed-sex participants were tested on bisection of lines. The stimuli used were four horizontal lines each measuring 115mm. All but one line were flanked by oblique lines pointing inward or outward to form arrows pointing to the left or right. The participants judged the centre of each line and the mean results showed that overall the participants’ exhibited a left bisection bias. These results indicate that perceptual factors may influence bisectional judgement in normal participants, where the presence or absence of arrowheads affects the bisection performance.