Static versus dynamic judgments of spatial extent

Hurwitz, Marc; Valadao, Derick; Danckert, James

doi:10.1007/s00221-011-2539-9

Cited by 9 publications

(6 citation statements)

References 56 publications

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“…As in prior research, eye movements were focused around the centre of the line (Barton et al 1998;Cavézian et al 2012;Hurwitz et al 2011;Ishiai et al 1989;Valadao et al 2010). Unlike Cavézian et al (2012), Wrst-Wxations were not biased toward the left, which could be the result of initial Wxations focusing on the transection mark and not to one side of it.…”

Section: Central Focus Of Eye Movementsmentioning

confidence: 87%

“…As prior work suggests gaze location might be directed to the right of centre (Elias et al 2005;Ishiai et al 1989;, if left-right diVerences emerge, a rightward gaze bias is expected. The majority of eye movements were expected to be focused around the middle of each stimulus (Barton et al 1998;Cavézian et al 2012;Hurwitz et al 2011;Ishiai et al 1989;Valadao et al 2010). However, we also expected that examining all x-coordinates would reveal that participants do in fact look at the entire stimulus over the course of the trial.…”

Section: Introductionmentioning

confidence: 98%

“…They attributed this rightward gaze to Kinsbourne's (1987) rightward-orienting tendency, where the single contralateral attentional vector of the left hemisphere becomes dominant when inhibition from the right hemisphere is insuYcient. Hurwitz et al (2011) observed eye movements during a manual pointing bisection task. They found Wrst-Wxations were right of centre for lines in left space and left of centre for lines in right space.…”

Section: Introductionmentioning

confidence: 99%

“…Cavézian et al (2012) used a novel task that employed a single luminance gradient (as in the greyscales task; Nicholls et al 1999) and had participants determine whether the stimulus was transected to the left or the right of centre. As in prior research (Barton et al 1998;Hurwitz et al 2011;Ishiai et al 1989;Valadao et al 2010), participants did not scan the entire stimulus, with the majority of Wxations focusing on the centre. First-Wxations were leftward, and second Wxations fell to the right, suggesting participants considered the two halves and compared them to determine transector location.…”

Section: Introductionmentioning

confidence: 99%

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Central fixations with rightward deviations: saccadic eye movements on the landmark task

Loetscher

Nicholls

2012

Exp Brain Res

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Neurologically normal individuals show an attentional bias toward the left side, which results from right hemisphere activation during visuospatial tasks. The strength of this bias is influenced by various factors, such as line length, vertical elevation and presentation time. What remains unknown is how participants gather information via saccadic eye movements during task performance and how this relates to their responses. Eye movements were recorded while participants performed the landmark task. Fixations and saccades were both analysed to gain a complete understanding of eye movement patterns. Fixations tended to focus on the centre of the line, with few left-right differences. Saccades were examined by creating histograms illustrating all x-coordinates which were examined over the course of each trial. Interestingly, mean eye position varied with participant response, with an overall tendency to look to the right of centre. Results are consistent with prior research, which has primarily looked at fixations and demonstrates the necessity of examining saccades as well as fixations in order to see how eye movement patterns relate to pseudoneglect.

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Section: Central Focus Of Eye Movementsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Central fixations with rightward deviations: saccadic eye movements on the landmark task

Loetscher

Nicholls

2012

Exp Brain Res

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“…Analyses comparing the degree of leftright asymmetry showed no overall difference across the two samples of participants in Experiments 1 and 3, with a strong bias overall to perceive a rectangle as wider when it was shown on the left side of the display compared to the right side. While pseudoneglect has been extensively studied using midpoint judgments of single lines or objects (Benwell, Thut, Learmonth, & Harvey, 2013;Darling, Logie, & Della Sala, 2012;Hurwitz, Valadao, & Danckert, 2011;Jewell & McCourt, 2000;Luh, 1995;McCourt, Garlinghouse, & Slater, 2000;McCourt & Jewell, 1999;McCourt & Olafson, 1997;Nicholls, Hughes, Mattingley, & Bradshaw, 2004;Nielsen, Intriligator, & Barton, 1999;Orr & Nicholls, 2005;Rueckert et al, 2002;Toba et al, 2011), to our knowledge assessments of size and shape asymmetries across multiple objects have received far less attention with the study by Charles et al (2007) being an important exception. The present results support the pseudoneglect literature showing that pseudoneglect can be observed not only in the perceived midpoint of a line but also in relative width judgments (Charles et al, 2007), gap detection (Bradshaw et al, 1986), and gradient detection (Nicholls et al, 2004;Orr & Nicholls, 2005).…”

Section: Discussionmentioning

confidence: 99%

The attentional repulsion effect and relative size judgments

Fortenbaugh

Sugarman

Robertson

et al. 2018

Atten Percept Psychophys

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Rapid shifts of involuntary attention have been shown to induce mislocalizations of nearby objects. One pattern of mislocalization, termed the Attentional Repulsion Effect (ARE), occurs when the onset of peripheral pre-cues lead to perceived shifts of subsequently presented stimuli away from the cued location. While the standard ARE configuration utilizes vernier lines, to date, all previous ARE studies have only assessed distortions along one direction and tested one spatial dimension (i.e., position or shape). The present study assessed the magnitude of the ARE using a novel stimulus configuration. Across three experiments participants judged which of two rectangles on the left or right side of the display appeared wider or taller. Pre-cues were used in Experiments 1 and 2. Results show equivalent perceived expansions in the width and height of the pre-cued rectangle in addition to baseline asymmetries in left/right relative size under no-cue conditions. Altering cue locations led to shifts in the perceived location of the same rectangles, demonstrating distortions in perceived shape and location using the same stimuli and cues. Experiment 3 demonstrates that rectangles are perceived as larger in the periphery compared to fixation, suggesting that eye movements cannot account for results from Experiments 1 and 2. The results support the hypothesis that the ARE reflects a localized, symmetrical warping of visual space that impacts multiple aspects of spatial and object perception.

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Functional MRI of dynamic judgments of spatial extent

2011

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Judgments of spatial relationships are often made when the object or observer is moving. Behaviourally, there is evidence that these 'dynamic' judgments of spatial extent differ from static judgments. For example, in one of the simplest probes of spatial extent--the line bisection task--the typically observed leftward bisection bias of about 1% of line length is increased considerably after left-to-right scanning. Here we used fMRI to examine whether or not different brain regions would be involved in static and dynamic judgments of spatial extent. Dynamic (i.e., scan the line prior to bisecting) relative to static ocular bisections (i.e., line bisection by fixation) produced activations in the cuneus and precuneus bilaterally, with reduced activation relative to static judgments observed in the supramarginal gyrus bilaterally. Dynamic bisections relative to a control condition (i.e., scan a line and then saccade to a transection mark) produced activations in the precuneus/superior parietal lobe bilaterally and left cerebellum. Only marginal evidence was found for different activations due to the initial scan direction of the line. These results highlight the fact that dynamic judgments of spatial extent use distinct brain regions from those employed to make static judgments, and the same mechanism is employed independent of scan direction. It may be the case that velocity processing and time estimates are integrated primarily in the cuneus and precuneus to produce estimates of spatial extent under dynamic scanning conditions.

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Static versus dynamic judgments of spatial extent

Cited by 9 publications

References 56 publications

Central fixations with rightward deviations: saccadic eye movements on the landmark task

Central fixations with rightward deviations: saccadic eye movements on the landmark task

The attentional repulsion effect and relative size judgments

Functional MRI of dynamic judgments of spatial extent

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