Hitting the Target: Relatively Easy, Yet Absolutely Difficult

Mapp, Alistair P.; Ono, Hiroshi; Khokhotva, Mykola

doi:10.1068/p5677

Cited by 5 publications

(1 citation statement)

References 20 publications

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“…“The eye” is a simplification which has been adequate for Experiments 1 to 5. For near targets especially, a cyclopean eye may often be the pivot [Khokhotva, Ono, & Mapp, 2005; Mapp, Ono, & Khokhotva, 2007; Ono, Mapp, & Howard, 2002; also see Erkelens (2000) and Khan and Crawford (2001) for different interpretations]. In binocular vision, double-vision of a pointing fingertip can result in two fingers apparent in the visual field, straddling a distant target in azimuth (Henriques & Crawford, 2002).…”

Section: Discussionmentioning

confidence: 99%

Pivots for pointing: Visually-monitored pointing has higher arm elevations than pointing blindfolded.

Wnuczko

Kennedy

2011

Journal of Experimental Psychology: Human Perception and Perfor

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Observers pointing to a target viewed directly may elevate their fingertip close to the line of sight. However, pointing blindfolded, after viewing the target, they may pivot lower, from the shoulder, aligning the arm with the target as if reaching to the target. Indeed, in Experiment 1 participants elevated their arms more in visually monitored than blindfolded pointing. In Experiment 2, pointing to a visible target they elevated a short pointer more than a long one, raising its tip to the line of sight. In Experiment 3, the Experimenter aligned the participant's arm with the target. Participants judged they were pointing below a visually monitored target. In Experiment 4, participants viewing another person pointing, eyes-open or eyes-closed, judged the target was aligned with the pointing arm. In Experiment 5, participants viewed their arm and the target via a mirror and posed their arm so that it was aligned with the target. Arm elevation was higher in pointing directly.

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Section: Discussionmentioning

confidence: 99%

Pivots for pointing: Visually-monitored pointing has higher arm elevations than pointing blindfolded.

Wnuczko

Kennedy

2011

Journal of Experimental Psychology: Human Perception and Perfor

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The cyclopean illusion unleashed

2007

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The cyclopean illusion is the apparent lateral shift of stationary stimuli on a visual axis that occurs when vergence changes. This illusion is predictable from the rules of visual direction. There are three stimulus situations reported in the literature, however, in which the illusion does not occur. In the three experiments reported here we examine those stimulus situations. Experiment 1 showed that an afterimage seen on a stimulus moving on the visual axis does not produce the illusion as reported in the literature but an afterimage seen on a screen does. Experiment 2 showed that the illusion occurs for an intermittently presented stimulus in contrast to what has been reported previously. Experiment 3 showed that a monocular stimulus presented against a random-dot background produced the illusion, also in contrast to what has been reported. The results were consistent with the rules of visual direction.

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The effects of monocular viewing on hand-eye coordination during sequential grasping and placing movements

González

Niechwiej-Szwedo

2016

Vision Research

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The contribution of binocular vision to the performance of reaching and grasping movements has been examined previously using single reach-to-grasp movements. However, most of our daily activities consist of more complex action sequences, which require precise temporal linking between the gaze behaviour and manual action phases. Many previous studies found a stereotypical hand-eye coordination pattern, such that the eyes move prior to the reach initiation. Moving the eyes to the target object provides information about its features and location, which can facilitate the predictive control of reaching and grasping. This temporal coordination pattern has been established for the performance of sequential movements performed during binocular viewing. Here we manipulated viewing condition and examined the temporal hand-eye coordination pattern during the performance of a sequential reaching, grasping, and placement task. Fifteen participants were tested on a sequencing task while eye and hand movements were recorded binocularly using a video-based eyetracker and a motion capture system. Our results showed that monocular viewing disrupted the temporal coordination between the eyes and the hand during the place-to-reach transition phase. Specifically, the gaze shift was delayed during monocular compared to binocular viewing. The shift in gaze behaviour may be due to increased uncertainty associated with the performance of the placement task because of increased vergence error during monocular viewing, which was evident in all participants. These findings provide insight into the role of binocular vision in predictive control of sequential reaching and grasping movements.

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Hitting the Target: Relatively Easy, Yet Absolutely Difficult

Cited by 5 publications

References 20 publications

Pivots for pointing: Visually-monitored pointing has higher arm elevations than pointing blindfolded.

Pivots for pointing: Visually-monitored pointing has higher arm elevations than pointing blindfolded.

The cyclopean illusion unleashed

The effects of monocular viewing on hand-eye coordination during sequential grasping and placing movements

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