Bisecting rods and lines: Effects of horizontal and vertical posture on left-side underestimation by normal subjects

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

doi:10.1016/0028-3932(85)90029-6

Cited by 124 publications

(44 citation statements)

References 9 publications

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“…The leftward bias seen in the lower VF on prolonged trials stands in contrast to previously reported upward biases on line bisection (Bradshaw et al, 1985;Drain & Reuter-Lorenz, 1996;McCourt & Olafson, 1997) and greyscales (Nicholls et al, 2004;Nicholls et al, 2006b) tasks. However, these biases were observed for vertical stimuli as opposed to horizontal In contrast to this, lower and left VF advantages are seen for global processing, coordinate spatial judgments and global motion (Christman & Niebauer, 1997).…”

Section: Discussioncontrasting

confidence: 99%

“…Biases toward the upper features have been observed on line bisection (Bradshaw et al, 1985;Drain & Reuter-Lorenz, 1996;McCourt & Olafson, 1997) and on the greyscales task (Nicholls et al, 2004b;2006b). Both leftward and upward biases have been explained in relation to object-centred biases in that the most significant features of a stimulus are attended to.…”

Section: List Of Tablesmentioning

confidence: 97%

“…An upward bias has been observed when using vertical stimuli, that span both the upper and lower VFs (Bradshaw, Nettleton, Nathan, & Wilson, 1985;Drain & Reuter-Lorenz, 1996;McCourt & Olafson, 1997;Nicholls, Mattingley, Berberovic, Smith, & Bradshaw, 2004;Nicholls, Smith, Mattingley, & Bradshaw, 2006). Biases toward the upper features have been observed on line bisection (Bradshaw et al, 1985;Drain & Reuter-Lorenz, 1996;McCourt & Olafson, 1997) and on the greyscales task (Nicholls et al, 2004b;2006b).…”

Section: List Of Tablesmentioning

confidence: 99%

“…A bias toward the upper features of vertical stimuli has been observed on line bisection (Bradshaw et al, 1985;Drain & Reuter-Lorenz, 1996;McCourt & Olafson, 1997). Both leftward and upward biases have been explained in relation to object-centred biases as the most significant features are attended to, with the left side being significant due to Western reading and scanning habits and upper features carrying more information than the lower ones (Jeerakathil & Kirk, 1994).…”

Section: Introductionmentioning

confidence: 95%

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Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

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Neurologically normal individuals show a leftward spatial bias and tend to collide with objects on the right side more frequently than on the left. The upper visual field is associated with extrapersonal space, and mediated by the ventral stream through parvocellular projections.The lower visual field is associated with peripersonal space, and mediated by the dorsal stream through magnocellular projections. Upper and lower visual field differences have been observed in perceptual asymmetries but results have been mixed. Object-and space-based coordinates also both influence the leftward bias; however their relative contributions are unknown as similar spatial conditions are often collapsed across. More left-side collisions emerged on a route following task in the lower visual field and more right-side collisions were seen in the upper visual field (Thomas, Stuckel, Gutwin, & Elias, 2009). Left-handers made more right-side collisions in the central condition, whereas right-handers showed no bias. Leftward biases on the greyscales task were stronger in the lower visual field; however no distance-based differences were observed (Thomas & Elias, 2010). A stronger spatial bias was found on the greyscales task, whereas a stronger object-based bias was found on the object luminosity task (Thomas & Elias, in press). When individual spatial conditions were examined, the image chosen most often was always located in the lower field. Stimulus type and spatial location interacted to determine which coordinate type contributes more strongly to leftward biases. We also found that the leftward bias on the greyscales task was stronger in the lower visual field during prolonged presentation and in the upper visual field during brief presentation. A global motion task was created to preferentially engage magnocellular projections to the dorsal stream. Isoluminant red/green and blue/yellow colour tasks, which preferentially engage parvocellular projections to the ventral stream, were also created. Leftward biases were seen on the greyscales and motion tasks. On an isoluminant colour task, biases were significantly weakened, suggesting

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Section: Discussioncontrasting

confidence: 99%

Section: List Of Tablesmentioning

confidence: 97%

Section: List Of Tablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

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“…Most studies have used mixed sex subject groups [31,48,50,60,79,95,113,120] or failed to report the sex of subjects [4,6,9,11,40,57,95,103,111]. The majority of studies examining the in¯uence of sex report non-signi®cant eects [16,19,30,42,73,86,92,110,115]. However, Roig and Cicero [105] found that males erred more to the 2 While various response criteria have been used to measure bisection performance, this review uses mean signed deviation from veridical center as a response measure since it captures both the direction and amplitude of bisection errors.…”

Section: Sexmentioning

confidence: 99%