9 Result(s)
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Article
M. Mon-Williams
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Article
Looking at the task in hand: vergence eye movements and perceived size
A retinal afterimage of the hand changes size when the same unseen hand is moved backwards and forwards in darkness. We demonstrate that arm movements per se are not sufficient to cause a size change and that ver...
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The size-distance paradox is a cognitive phenomenon
The perceived size of a fixated object is known to be a function of the perceived fixation distance. The size-distance paradox has been posited as evidence that the perceived distance of a fixated object is, ...
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The use of vergence information in the programming of prehension
Human prehension requires accurate information on the properties of an object and on the position of the object relative to the body. In principle, prehension might be more accurate with binocular rather than ...
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A test between two hypotheses and a possible third way for the control of prehension
We used an obstacle avoidance task to test two opposing accounts of how the nervous system controls prehension. The visuomotor account supposes that the system independently controls the grip formation and tr...
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The size of the visual size cue used for programming manipulative forces during precision grip
We used a perturbation technique to quantify the contribution of visual size cues to the programming of target force when lifting an object. Our results indicate that the nervous system attaches a reasonable ...
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Bimanual aiming and overt attention: one law for two hands
Reaching to interact with an object requires a compromise between the speed of the limb movement and the required end-point accuracy. The time it takes one hand to move to a target in a simple aiming task can ...
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Is tracing or copying better when learning to reproduce a pattern?
Learning to write requires the repeated manual production of spatial patterns. It remains unclear whether tracing or copying provides better training: tracing provides accurate and immediate performance feedba...
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A new tool for assessing head movements and postural sway in children
Current methods of measuring gross motor abilities in children involve either high-cost specialist apparatus that is unsuitable for use in schools, or low-cost but nonoptimal observational measures. We describ...
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A systematic examination of preoperative surgery warm-up routines
Recent evidence indicates that a preoperative warm-up is a potentially useful tool in facilitating performance. But what factors drive such improvements and how should a warm-up be implemented?
