rCBF landscapes during motor performance and motor ideation of a graphic gesture

Decety, Jean; Philippon, B.; Ingvar, David H.

doi:10.1007/bf00381078

Cited by 98 publications

(39 citation statements)

References 20 publications

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“…On the one hand, beginning with the work of Roland, Skinhoj, Lassen & Larsen, (1980), two decades of functional neuroimaging studies have demonstrated that imagining movements activates areas involved in motor planning and control including: cerebellum and basal ganglia (e.g. Decety, Philippon & Ingvar, 1988;Parsons et al, 1995), supplementary and pre-motor areas (e.g. Decety et al, 1994;Deiber, Ibanez, Honda, Sadato, Raman & Hallett, 1997;Parsons et al, 1995;Rao et al, 1993), posterior parietal cortex (e.g.…”

Section: Relationship Between Motor Imagery and Motor Planningmentioning

confidence: 99%

Thinking ahead: the case for motor imagery in prospective judgements of prehension

2000

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How similar are judgements concerning how we expect to perform an action, to how we actually behave? The veracity of such prospective action judgements, and the mechanisms by which they are computed, was explored in a series of tasks that involved either grasping (MC conditions) or thinking about grasping (PJ conditions) a dowel presented in various orientations. PJs concerning limits of comfortable hand supination and pronation when turning a dowel in the picture plane were highly consistent with values obtained during actual hand rotation (Exp. 1). The same was true for judgements regarding the level of awkwardness involved in adopting a prescribed grip (e.g. overhand with right hand) for dowels in various picture plane orientations (Exp. 2). When allowed to select the most natural grip (overhand versus underhand) or hand (left versus right) for engaging dowels in these orientations, subjects preferred virtually identical responses in both PJ and MC conditions. In both instances, they consistently chose the least awkward response options. As would be expected for actual movements, PJs involving awkward hand postures had longer response times (RTs), and were less accurate. Likewise, latencies for both grip and hand judgements tended to increase as a function of the angular distance between the current positions of subjects' hands, and the orientation of the chosen posture. Together, these ®ndings are consistent with a the hypothesis that PJs involve mentally simulated actions, or motor imagery. These results suggest that motor imagery does not depend on the existence of a completed premotor plan (Jeannerod, 1994), but may instead be involved in the planning process itself. A provisional model for the involvement of imagery in motor planning is outlined, as are a set of criteria for evaluating claims of the involvement of motor imagery in problem solving. q

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Section: Relationship Between Motor Imagery and Motor Planningmentioning

confidence: 99%

Thinking ahead: the case for motor imagery in prospective judgements of prehension

2000

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“…Their results thus confirmed that the SMA plays an important role for the internal programming and simulation of complex motor sequences. Measuring rCBF with mXenon and a gamma camera, Decety, Philippon and Ingvar [2] studied normal subjects during the execution or during the imagination of a graphic movement (writing 'one, two, three, etc.') either with the right or the left hand.…”

Section: Measurements Of Regional Cerebral Blood Flowmentioning

confidence: 99%

Do imagined and executed actions share the same neural substrate?

Decety

1996

Cognitive Brain Research

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535

291

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This paper addresses the issue of the functional correlates of motor imagery, using mental chronometry, monitoring the autonomic responses and measuring cerebral blood flow in humans. The timing of mentally simulated actions closely mimic actual movement times. Autonomic responses during motor imagery parallel the autonomic responses to actual exercise. Cerebral blood flow increases are observed in the motor cortices involved in the programming of actual movement (i.e. premotor cortex, anterior cingulate, inferior parietal lobule and cerebellum). These three sources of data provide converging support for the hypothesis that imagined and executed actions share, to some extent, the same central structures.

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“…Subsequent studies employed different methods (SPECT, PET, functional MRI) and various tasks of ISM. It was consistently reported that SMA is active with internal simulation of movements but MI is not active [8,9,11,26,28,30]. In addition to SMA other parts of the cortex were reported to be active with ISM although with little consistency, possibly due to differences among the tasks employed.…”

Section: Introductionmentioning

confidence: 99%

Electric and magnetic fields of the brain accompanying internal simulation of movement

Lang¹,

Cheyne

Höllinger³

et al. 1996

Cognitive Brain Research

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Methods of functional brain imaging have been used to identify brain structures which are active during internal simulation of movements (ISM). Between 1977 and 1993 it was consistently reported that the primary motor cortex (MI) is not active during ISM whereas other cortical areas, in particular the supplementary motor area (SMA) are active. ISM was assumed to be a situation of 'internal programming'. Brain systems involved in ISM or 'programming' were hypothesized to be superior to and separable from 'executive system' including MI. We have studied electric and magnetic fields of the brain when subjects internally simulated either a single movement or a sequence of movements. Results of the studies are consistent with the assumption that MI is active with ISM. Internally subjects experienced effort which was required to inhibit overt movements during ISM. A recent EEG study showed different patterns of cortical activity with ISM and with movement inhibition suggesting that different brain structures may be active during ISM and movement inhibition [23].

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rCBF landscapes during motor performance and motor ideation of a graphic gesture

Cited by 98 publications

References 20 publications

Thinking ahead: the case for motor imagery in prospective judgements of prehension

Thinking ahead: the case for motor imagery in prospective judgements of prehension

Do imagined and executed actions share the same neural substrate?

Electric and magnetic fields of the brain accompanying internal simulation of movement

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