Yalancı İhmal ve Çizgi Bölme Testi: Cinsiyet, el tercihi, kullanılan el ve tarama yönü değişkenlerinin etkisi
Pseudoneglect and Line Bisection Test: The effects of gender, handedness, hand used, and scanning direction variables

Summary/Abstract: The Line Bisection Test (LBT) is one of the oldest tools in assessing patients with neglect. In the test, patients are asked to bisect horizontal lines printed on paper by marking their midpoint, and it has been reported that patients with neglect tend to bisect the lines with a rightward bias from the true center. Due to its sensitivity to visuospatial functions, the LBT is also frequently administered to healthy participants. Unlike neglect patients, healthy individuals show a leftward bias, referred to as “pseudoneglect”. This study aims to evaluate pseudoneglect and LBT performance in the context of gender, handedness, hand used for line bisection, and scanning direction. The sample consisted of 34 university students (16 female; 18 left-handed) aged between 19 and 24 years (M = 20.9 ± 1.71). Participants completed a Participant Information Form, the Edinburgh Handedness Inventory, and the LBT. 2 (gender: female/male) × 2 (handedness: right-/left-handed) × 2 (hand used: right/left) × 2 (scanning direction: left-to-right/right-to-left) mixed-factorial design was employed. Gender and handedness were measured as between-subjects variables, and hand used and scanning direction as within-subjects variables. The LBT was administered four times, with hand used and scanning direction counterbalanced. Participants’ performance was evaluated by calculating the direction and degree of deviation from the true center for each line. The analysis revealed a significant main effect of hand used in LBT (p = .001) and a significant three-way interaction between gender, handedness, and scanning direction (p = .014). These findings indicate that healthy individuals do not always exhibit leftward deviation and that pseudoneglect may vary depending on the interaction of multiple factors.

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