Perceptual–attentional and motor-intentional bias in near and far space

Garza, John P.; Eslinger, Paul J.; Barrett, Anna M.

doi:10.1016/j.bandc.2008.02.006

Cited by 34 publications

(76 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A reaction time advantage has also been observed in extrapersonal space and upper VF conditions (Previc & Blume, 1993). Previous research has typically shown a stronger leftward bias in peripersonal space than in extrapersonal space (Bjoertomt et al, 2002;Garza et al, 2008). Consistent with the relation between viewing distance and the upper and lower VFs, we observed a stronger leftward bias in the lower VF on a task completed in peripersonal space.…”

Section: Discussionsupporting

confidence: 88%

“…This is a significant finding as there had been a lack of work studying upper and lower VF differences in perceptual asymmetries and the greyscales task had not previously been used to study them. VF differences were not associated with viewing distance, and although some work had shown a space-based dissociation (Bjoertomt et al, 2002;Garza et al, 2008;Longo & Lourenco, 2006;Varnava et al, 2002), others failed to identify any differences (Longo & Lourenco, 2006, Wilkinson & Halligan, 2003. We concluded that although VF differences were not linked with space-based processing differences, the proposed relation between space-based and VF processing does not have strong empirical support either.…”

Section: Discussionmentioning

confidence: 65%

“…It has been suggested that this reliably observed phenomenon is similar to clinical hemispatial neglect and therefore has been referred to as pseudoneglect (Bowers & Heilman, 1980). Examinations of pseudoneglect in peripersonal and extrapersonal space using line bisection and landmark tasks have typically found that the leftward bias is stronger in peripersonal space than extrapersonal space (Bjoertomt et al, 2002;Garza, Eslinger, & Barrett, 2008), with one study identifying a progressive bias that became rightward in extrapersonal space (Varnava, McCarthy, & Beaumont, 2002).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

View full text Add to dashboard Cite

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

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Upper and lower visual field differences in perceptual asymmetries

Elias

2011

Brain Research

View full text Add to dashboard Cite

show abstract

“…Nevertheless, the percentage of units related to the kinematic parameters was very low in all regions (in every region: <2%). To verify that the decreased neuronal modulations are not because of reduced attention to the passive observation task (Khan, Heinen, & McPeek, 2010;Garza, Eslinger, & Barrett, 2008;Chiba, Yamaguchi, & Eto, 2005;Boussaoud, 2001), we repeated the analysis using data limited to only the first 5 min of every session, during which higher attention of the subject was observed. This analysis found very low percentages of cells related to the kinematic parameters …”

Section: Discussionmentioning

confidence: 99%

Visuomotor Coordination and Motor Representation by Human Temporal Lobe Neurons

Tankus

Fried

2012

Journal of Cognitive Neuroscience

View full text Add to dashboard Cite

The division of cortical visual processing into distinct dorsal and ventral streams is a key concept in primate neuroscience [Goodale, M. A., & Milner, A. D. Separate visual pathways for perception and action. Trends in Neurosciences, 15, 20-25, 1992; Steele, G., Weller, R., & Cusick, C. Cortical connections of the caudal subdivision of the dorsolateral area (V4) in monkeys. Journal of Comparative Neurology, 306, 495-520, 1991]. The ventral stream is usually characterized as a "What" pathway, whereas the dorsal stream is implied in mediating spatial perception ("Where") and visually guided actions ("How"). A subpathway emerging from the dorsal stream and projecting to the medial-temporal lobe has been identified [Kravitz, D. J., Saleem, K. S., Baker, C. I., & Mishkin, M. A new neural framework for visuospatial processing. Nature Reviews Neuroscience, 12, 217-230, 2011; Cavada, C., & Goldman-Raiuc, P. S. Posterior parietal cortex in rhesus monkey: I. Parcellation of areas based on distinctive limbic and sensory cortico-cortical connections. Journal of Comparative Neurology, 287, 393-421, 1989]. The current article studies the coordination of visual information typically associated with the dorsal stream ("Where"), with planned movements, focusing on the temporal lobe. We recorded extracellular activity from 565 cells in the human medial-temporal and frontal lobes while 13 patients performed cued hand movements with visual feedback (visuomotor task), without feedback (motor task), or observed visual feedback without motor movement (visual-only task). We discovered two different neural populations in the human medial-temporal lobe. One consists of motor-like neurons representing hand position, speed or acceleration during the motor task but not during the visuomotor or visual tasks. The other is specific to the parahippocampal gyrus (an area known to process visual motion [Gur, M., & Snodderly, D. M. Direction selectivity in V1 of alert monkeys: Evidence for parallel pathways for motion processing. Journal of Physiology, 585, 383-400, 2007; Sato, N., & Nakamura, K. Visual response properties of neurons in the parahippocampal cortex of monkeys. Journal of Neurophysiology, 90, 876-886, 2003]) and encodes speed, acceleration, or direction of hand movements, but only during the visuomotor task: neither during visual-only nor during motor tasks. These findings suggest a functional basis for the anatomical subpathway between the dorsal stream and the medial-temporal lobe. Similar to the recent expansion of the motor control process into the sensory cortex [Matyas, F., Sreenivasan, V., Marbach, F., Wacongne, C., Barsy, B., Mateo, C., et al. Motor control by sensory cortex. Science, 330, 1240-1243, 2010], our findings render the human medial-temporal lobe an important junction in the process of planning and execution of motor acts whether internally or externally (visually) driven. Thus, the medial-temporal lobe might serve as an integration node between the two processing streams. Our findings thus shed new light on the br...

show abstract

“…Brief peripheral cues are known to draw the perceived middle of the line towards their location (Bultitude and Aimola Davies 2006;Nicholls and Roberts 2002). Attention is also drawn to the side of the line with more 'mass' (McCourt and Garlinghouse 2000) or towards an experimenter standing to one side of the display (Garza, Eslinger, and Barrett 2008).…”

Section: Methodsmentioning

confidence: 99%