Leftwards error in bisecting the gap between two points: Stimulus quality and hand effects

Bradshaw, John L.; Bradshaw, Judy A.; Nathan, Greg; Nettleton, Norman C.; Wilson, Lyn

doi:10.1016/0028-3932(86)90084-9

Cited by 71 publications

(30 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most authors report that subjects err to the left of veridical line center with either hand, although when the left hand is used subjects err farther left than when the right hand is used [13,19,42,80,97,101,105,110]. However, two studies found that when the right hand was used, subjects erred to the right of veridical, whereas when the left hand was used, subjects erred to the left of veridical [44,111].…”

Section: Hand Used To Perform Bisectionmentioning

confidence: 99%

“…All conditions in the experiment produced leftward errors; however, central ®xation increased error magnitude. Central ®xation also produced greater leftward errors when subjects bisected the space between two light emitting diodes (LEDs) [13]. Chokron et al [28] manipulated the direction in which lines were visually scanned during a passive bisection task and found leftward errors in the left-to-right scanning condition, and rightward errors in the right-toleft scanning condition.…”

Section: Directional Scanningmentioning

confidence: 99%

“…In a task performed in the dark, Bradshaw et al [13] had subjects bisect the gap between two illuminated LEDs by moving a third LED mounted on a slide. The LEDs, which acted as the line endpoints, were varied in their brightness,¯ashing rate, and the timing of their onset and oset.…”

Section: Lateralized Cuesmentioning

confidence: 99%

See 2 more Smart Citations

Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks

2000

View full text Add to dashboard Cite

Section: Hand Used To Perform Bisectionmentioning

confidence: 99%

Section: Directional Scanningmentioning

confidence: 99%

See 1 more Smart Citation

Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks

2000

View full text Add to dashboard Cite

“…Line bisection errors occur toward the end of a stimulus that is overattended (Bradshaw, Bradshaw, Nathan, Nettleton, & Wilson, 1986;Bultitude & Aimola Davies, 2006;McCourt & Jewell, 1999). In the case of a door, which is located in extrapersonal space, the perceived midpoint would be located to the right of the true center (Longo & Lourenco, 2006).…”

mentioning

confidence: 99%

Deviating to the right: Using eyetracking to study the role of attention in navigation asymmetries

Robertson

Forte

Nicholls

2014

Atten Percept Psychophys

View full text Add to dashboard Cite

The ability to navigate accurately through the environment and avoid obstacles is essential for effective interactions with the environment. It is therefore surprising that systematic rightward errors are observed when neurologically intact participants navigate through doorways-most likely due to the operation of biases in spatial attention. These rightward errors may arise due to the operation of an extinction-like process, whereby participants overattend to the left doorpost and collide with the right one. Alternatively, rightward biases might reflect a bisection bias, such that the extrapersonal nature of the aperture causes participants to misbisect the aperture slightly to the right of true center. Because eye movements and spatial attention are closely related, in this study we used eyetracking to test the extinction and bisection models in a remote wheelchair navigation task. University students (n = 16) made rightward errors when navigating the wheelchair through a doorway, and fixated more frequently toward the right side of the aperture throughout the trial. These results are inconsistent with an extinction-based theory of navigation asymmetry, which predicts a leftward bias in eye position due to participants overattending to the left side of the doorway. Instead, the observed rightward bias in eye movements strongly supports a bisection-based theory of navigation asymmetry, whereby participants mentally "mark" the midpoint of a doorway toward the right and then head toward that point, resulting in rightward deviations. The rightward nature of participants' navigation errors and eye positions is consistent with the existence of a rightward attentional bias for extrapersonal stimuli.

show abstract

“…The line bisection task is a simple but very sensitive method to demonstrate visual-spatial asymmetry in human subjects (13,14). Also, it gives an opportunity to investigate the effects of hand use and the hemispace in which the bisection action is performed.…”

mentioning

confidence: 99%

An investigation of visual-spatial attention in children with attention deficit hyperactivity disorder Dikkat eksikliği hiperaktivite bozukluğu olan çocuklarda görsel-uzaysal dikkatin araştırılması

Emel¹

2005

Ankara Üniversitesi Tıp Fakültesi Mecmuası

View full text Add to dashboard Cite

Aim: Attention deficit hyperactivity disorder (ADHD ) has been associated with a disturbance in frontal lobe network function, mediated by the underactivity of right hemispheric frontostriatal regions and loss of normal functional asymmetry. The aim of this study was to examine the right hemisphere functions and lateralization of visual-spatial attention in ADHD, using line bisection task. Materials and Methods: Eighteen children with a DSM IV diagnosis of ADHD participated with 18 healthy controls, individually matched for age, sex, handedness and school years. In the line bisection task, horizontal lines were presented on the computer screen. Half of the lines were presented in the right hemispatial area, and half in the left hemispatial area. Participants were instructed to move the vertical cursor to the judged center of the line by mouse. Subjects performed the task separately with each hand. The difference between fine motor performances was examined using finger tapping task. Results: In the line bisection task, bisection performance of the children with ADHD was significantly lower than that of the normal children. For mean bisection error scores, the controls were transecting the lines to the left of the center when the lines were presented in the left hemispace and to the right of the center when the lines were presented in the right hemispace, performing both hands. The subjects with ADHD showed the same but smaller bias than the controls. The apparent deviations from the actual center in the children with ADHD were not significantly different from zero in all conditions. In the finger tapping task, there were no significant differences between two groups for both hands. Conclusion: These results supported the evidence for deficit in visual-spatial attention consistent with disability of the right hemisphere in ADHD.Key words: attention deficit hyperactivity disorder, line bisection task, spatial attention, right cerebral hemisphere Amaç: Dikkat Eksikliği Hiperaktivite Bozukluğu (DEHB)'nun sağ fronto-striatal devreyi ilgilendiren bir bozukluğun sonucu olduğu iddia edilmektedir. Bu çalışmada çizgi bölme testi kullanılarak DEHB'de sağ hemisfer işlevlerinin ve görsel uzaysal dikkatin asimetrisinin incelenmesi amaçlan-mıştır. Gereç ve Yöntem: DSM-IV ölçütlerine göre DEHB tanısı almış, ilaç kullanmayan ve eşlik eden başka nörolojik veya psikiyatrik bozukluğu olmayan 7-14 yaşları arasında sağ elini kullanan 18 çocuk ile onlarla yaş, cinsiyet, el tercihi ve okul yaşı açısından bire bir eşleştirilmiş 18 sağlıklı çocuk araştırmaya dahil edildi. Bütün çocuklar çizgi bölme testini sağ ve sol elleri ile bilgisayar faresi kullanarak yaptılar. Bilgisayar ekranının yatay olarak sağından ve solundan sunulan çizgilerin tam orta noktalarını işaretlemeleri istendi. Ayrıca her iki gruptaki çocukların ince motor yetenekler açısından farkları parmak vuru testi ile değerlendirildi. Bulgular: DEHB olan çocuklar çizgi bölme testinde anlamlı olarak daha çok mutlak hata yaparak kontrol grubuna göre düşük bir performans gösterdi...

show abstract

Leftwards error in bisecting the gap between two points: Stimulus quality and hand effects

Cited by 71 publications

References 12 publications

Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks

Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks

Deviating to the right: Using eyetracking to study the role of attention in navigation asymmetries

An investigation of visual-spatial attention in children with attention deficit hyperactivity disorder Dikkat eksikliği hiperaktivite bozukluğu olan çocuklarda görsel-uzaysal dikkatin araştırılması

Contact Info

Product

Resources

About