Impaired Imagery for Upper Limbs

Overney, Leila S.; Blanke, Olaf

doi:10.1007/s10548-008-0065-2

Cited by 14 publications

(11 citation statements)

References 79 publications

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“…Previous studies showed that the mental rotation of body parts is sensitive to the orientation (Parsons 1987(Parsons , 1994Arzy et al 2006;Overney and Blanke 2008) and the view (Parsons 1994;Petit et al 2003;Ionta et al 2007) of the stimuli. Yet, the present results indicate that there is interdependence between orientation and view showing that uncommon views are less sensitive to orientation changes.…”

Section: Orientation and Viewmentioning

confidence: 98%

Differential influence of hands posture on mental rotation of hands and feet in left and right handers

2009

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The representation of the body in the brain is continuously updated with regard to peripheral factors such as position or movement of body parts. In the present study, we investigated the eVects of arm posture on the mental rotation of hands and feet. Sixteen right-handed and ten left-handed participants verbally judged the laterality of visually presented pictures of hands and feet in two diVerent postural conditions. In one condition they placed their right hand on their right knee and their left hand behind the back, in the other condition the hand position was reversed. For right-handed participants response times for the laterality judgment of right hands increased when participants kept their right hand behind the back. This was not found for images of the left hand nor for images of the feet. For the left-handed participants, there was no eVect of arm posture on hand or feet stimulus judgments. Thus, the body-part posture eVect on mental rotation was found to be speciWc for the side and the body part for which the posture was modiWed only in right-handed participants, but it was absent for left-handed participants. For both samples, we also found a progressive disruption of the mental rotation function depending on the view from which the body parts were seen (i.e. dorsal, thumb/big toe, palm/plantar, little Wnger/toe). Posture and view eVects on body parts representations are discussed with respect to proprioception, handedness, visual familiarity and the inXuence of anatomical joint constraints on motor imagery.

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Section: Orientation and Viewmentioning

confidence: 98%

Differential influence of hands posture on mental rotation of hands and feet in left and right handers

2009

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“…Ionta et al, 2010) and parietal cortex (e.g. Overney and Blanke, 2009). Activity in both the inferior parietal cortex (Wolbers et al, 2003) and the premotor cortex (de Lange et al, 2006;Malouin et al, 2003) increases as a function of imagery demand.…”

Section: Shared Spectral and Anatomical Mechanisms Between Motor Imagmentioning

confidence: 99%

Shared electrophysiology mechanisms of body ownership and motor imagery

Evans

Blanke

2013

NeuroImage

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Although we feel, see, and experience our hands as our own (body or hand ownership), recent research has shown that illusory hand ownership can be induced for fake or virtual hands and may be useful for neuroprosthetics and brain-computer interfaces. Despite the vast amount of behavioral data on illusory hand ownership, neuroimaging studies are rare, in particular electrophysiological studies. Thus, while the neural systems underlying hand ownership are relatively well described, the spectral signatures of body ownership as measured by electroencephalography (EEG) remain elusive. Here we induced illusory hand ownership in an automated, computer-controlled manner using virtual reality while recording 64-channel EEG and found that illusory hand ownership is reflected by a body-specific modulation in the mu-band over fronto-parietal cortex. In a second experiment in the same subjects, we then show that mu as well as beta-band activity in highly similar fronto-parietal regions was also modulated during a motor imagery task often used in paradigms employing non-invasive brain-computer interface technology. These data provide insights into the electrophysiological brain mechanisms of illusory hand ownership and their strongly overlapping mechanisms with motor imagery in fronto-parietal cortex. They also highlight the potential of combining high-resolution EEG with virtual reality setups and automatized stimulation protocols for systematic, reproducible stimulus presentation in cognitive neuroscience, and may inform the design of non-invasive brain-computer interfaces.

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“…Investigating the differences between different modalities of mental imagery (i.e., motor vs. visual), it has been suggested that left brain regions are more involved in motor imagery, whereas right brain regions are more involved in visual imagery (Sirigu and Duhamel 2001;Tomasino and Rumiati 2004). This has been extended by neuroimaging work studying mental imagery in healthy subjects and revealing a left-hemisphere dominance in body processing, showing the activation of superior parietal lobule (SPL) and cortex at the intraparietal sulcus (IPS) during mental imagery for human body parts (Overney and Blanke 2008;Overney et al 2005;de Jong et al 2001;Bonda et al 1995). Others reported bilateral parietal activations (Kosslyn et al 1998;Parsons et al 1995).…”

Section: Introductionmentioning

confidence: 98%

“…Activations at the temporo-parietal junction (TPJ) are generally bilateral or have been found mainly in the right or the left hemisphere (Zacks et al 1999). Finally, the majority of the studies that employed stimuli depicting human body parts such as hands or arms reported stronger left parietal activations (Overney and Blanke 2008;Overney et al 2005;de Jong et al 2001;Bonda et al 1995), whereas studies depicting full bodies revealed more bilateral (Zacks et al 1999(Zacks et al , 2002 or right parietal and/or temporo-parietal activations .…”

Section: Introductionmentioning

confidence: 99%

Mental Imagery for Full and Upper Human Bodies: Common Right Hemisphere Activations and Distinct Extrastriate Activations

et al. 2010

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The processing of human bodies is important in social life and for the recognition of another person's actions, moods, and intentions. Recent neuroimaging studies on mental imagery of human body parts suggest that the left hemisphere is dominant in body processing. However, studies on mental imagery of full human bodies reported stronger right hemisphere or bilateral activations. Here, we measured functional magnetic resonance imaging during mental imagery of bilateral partial (upper) and full bodies. Results show that, independently of whether a full or upper body is processed, the right hemisphere (temporoparietal cortex, anterior parietal cortex, premotor cortex, bilateral superior parietal cortex) is mainly involved in mental imagery of full or partial human bodies. However, distinct activations were found in extrastriate cortex for partial bodies (right fusiform face area) and full bodies (left extrastriate body area). We propose that a common brain network, mainly on the right side, is involved in the mental imagery of human bodies, while two distinct brain areas in extrastriate cortex code for mental imagery of full and upper bodies.

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Impaired Imagery for Upper Limbs

Cited by 14 publications

References 79 publications

Differential influence of hands posture on mental rotation of hands and feet in left and right handers

Differential influence of hands posture on mental rotation of hands and feet in left and right handers

Shared electrophysiology mechanisms of body ownership and motor imagery

Mental Imagery for Full and Upper Human Bodies: Common Right Hemisphere Activations and Distinct Extrastriate Activations

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