Free-viewing perceptual asymmetries for the judgement of brightness, numerosity and size

Nicholls, Michael E. R.; Bradshaw, John L.; Mattingley, Jason B.

doi:10.1016/s0028-3932(98)00074-8

Cited by 224 publications

(261 citation statements)

References 15 publications

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“…When performed by hemispatial neglect patients who have suffered right parietal damage (Brain, 1941;Vallar & Perani, 1986), the greyscales task shows a similar but opposing rightward bias (Mattingley et al, 2004). The greyscales task exhibits a bias similar to that observed on line bisection tasks (Mattingley, Pierson, Bradshaw, Phillips, & Bradshaw, 1993); however the greyscales are a newer task that have demonstrated both large and reliable effects (i.e., Nicholls et al, 1999). Further, using the greyscales, Nicholls and Roberts (2002) demonstrated that the leftward bias likely results from an attentional bias and not a pre-motor or scanning bias.…”

Section: Introductionmentioning

confidence: 89%

“…Key press responses, as well as response times, were recorded. A response bias score was calculated by subtracting the number of leftward responses from the number of rightward responses, with a negative score indicating a leftward bias (Nicholls et al, 1999). This task has been used extensively in examinations of perceptual asymmetries as the key press required by this task minimizes motor involvement in comparison to that required in line bisection tasks (i.e.,…”

Section: Methods Participantsmentioning

confidence: 99%

“…Spatial biases have subsequently been observed on several measures, including both manual and computerized line bisection (i.e., Jewell & McCourt, 2000;McCourt & Jewell, 1999), cancellation tasks (Vingiano, 1991), the landmark task (Dufour, Touzalin, & Candas, 2007), the greyscales task (Nicholls, Bradshaw, & Mattingley, 1999), and measures looking at judgments of numerosity, size (Nicholls et al, 1999) and distance (Krupp, Robinson, & Elias, in press). Lateral biases have also been identified on more real-world behaviours, such as passing through a doorway (Nicholls, Loftus, Mayer, & Mattingley, 2007;Nicholls, Loftus, Orr, & Barre, 2008), choosing a seat in the theatre (Okubo, 2010), completing a route following task (Thomas, Stuckel, Gutwin, & Elias, 2009) or multiple-choice questionnaire response patterns (Nicholls, Orr, Okubo, & Loftus, 2006).…”

Section: List Of Tablesmentioning

confidence: 99%

“…Perceptual asymmetries have been examined extensively using the greyscales task (Mattingley et al, 2004;Nicholls et al, 1999;Okubo & Nicholls, 2006). In the greyscales task, participants are presented with a pair of equiluminant, mirror-reversed rectangles that are bright on one side and dark on the other.…”

Section: Introductionmentioning

confidence: 99%

“…The greyscales task has been used to examine perceptual asymmetries (Nicholls et al, 1999). This task involves making a judgement between two equiluminant mirror-reversed rectangles going from black on one side to white on the other, one rectangle being dark on the left and the other dark on the right.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 89%

Section: Methods Participantsmentioning

confidence: 99%

Section: List Of Tablesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

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Modulating attentional biases of adults with autistic traits using transcranial direct current stimulation: A pilot study

et al. 2017

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Attentional differences between individuals with and without autism may reflect differences in underlying activation of the left and right hemispheres. In this study, we combine an attentional task that reflects relative hemispheric activation with non-invasive cortical stimulation, and show that attentional differences between healthy individuals with low and high levels of autistic-like traits can be reduced. This outcome is encouraging, and suggests that other aspects of attention in autism (e.g., face processing) may stand to benefit from similar stimulation techniques.

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A review of behavioral evidence for hemispheric asymmetry of visuospatial attention in autism

2023

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Most individuals show a small bias towards visual stimuli presented in their left visual field (LVF) that reflects right‐hemispheric specialization of visuospatial functions. Moreover, this bias is altered by some neurodevelopmental disorders, suggesting they may be linked to changes in hemispheric asymmetry. To examine whether autism potentially alters hemispheric asymmetry, we conducted a systematic search of scientific databases to review existing literature on the link between autism and alterations in visuospatial bias. This search identified 13 publications that had explored this issue using a wide range of experimental designs and stimuli. Evidence of reduced LVF bias associated with autism was most consistent for studies examining attentional bias or preference measured using tasks such as line bisection. Findings for studies examining attentional performance (e.g., reaction time) were more equivocal. Further investigation is called for, and we make several recommendations for how this avenue of research can be extended.

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Free-viewing perceptual asymmetries for the judgement of brightness, numerosity and size

Cited by 224 publications

References 15 publications

Upper and lower visual field differences in perceptual asymmetries

Upper and lower visual field differences in perceptual asymmetries

Modulating attentional biases of adults with autistic traits using transcranial direct current stimulation: A pilot study

A review of behavioral evidence for hemispheric asymmetry of visuospatial attention in autism

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