The timing of temporoparietal and frontal activations during mental own body transformations from different visuospatial perspectives

Schwabe, Lars; Lenggenhager, Bigna; Blanke, Olaf

doi:10.1002/hbm.20764

Cited by 33 publications

(36 citation statements)

References 57 publications

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“…This relationship between response time and angular disparity suggests that participants performed an imagined whole body transformation in which they mentally aligned themselves with the target. These findings have been replicated numerous times since in a variety of studies on egocentric transformations (Schwabe et al 2009;Wraga et al 2005;Zacks et al 1999). Similar results are found when making judgements about the location of another item in relation to a person (e.g.…”

Section: Egocentric Transformationssupporting

confidence: 70%

Spatial Transformations of Bodies and Objects in Adults with Autism Spectrum Disorder

Pearson

Marsh

Hamilton

et al. 2014

J Autism Dev Disord

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Previous research into autism spectrum disorder (ASD) has shown people with autism to be impaired at visual perspective taking. However it is still unclear to what extent the spatial mechanisms underlying this ability contribute to these difficulties. In the current experiment we examine spatial transformations in adults with ASD and typical adults. Participants performed egocentric transformations and mental rotation of bodies and cars. Results indicated that participants with ASD had general perceptual differences impacting on response times across tasks. However, they also showed more specific differences in the egocentric task suggesting particular difficulty with using the self as a reference frame. These findings suggest that impaired perspective taking could be grounded in difficulty with the spatial transformation used to imagine the self in someone else's place. © 2014 Springer Science+Business Media New York

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Section: Egocentric Transformationssupporting

confidence: 70%

Spatial Transformations of Bodies and Objects in Adults with Autism Spectrum Disorder

Pearson

Marsh

Hamilton

et al. 2014

J Autism Dev Disord

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“…5 b and c. The electrode with maximal amplitude for map 2 was found at electrode Pz and for map 5 at electrode F4. Due to the low number of electrodes no linear inverse solution was applied to the data (as done for example in Schwabe et al, 2009;Arzy et al, 2006).…”

Section: Eeg Resultsmentioning

confidence: 99%

Early and late activity in somatosensory cortex reflects changes in bodily self-consciousness: An evoked potential study

2012

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Abstract-How can we investigate the brain mechanisms underlying self-consciousness? Recent behavioural studies on multisensory bodily perception have shown that multisensory conflicts can alter bodily self-consciousness such as in the ''full body illusion'' (FBI) in which changes in self-identification with a virtual body and tactile perception are induced. Here we investigated whether experimental changes in self-identification during the FBI are accompanied by activity changes in somatosensory cortex by recording somatosensory-evoked potentials (SEPs). To modulate self-identification, participants were filmed by a video camera from behind while their backs were stroked, either synchronously (illusion condition) or asynchronously (control condition) with respect to the stroking seen on their virtual body. Tibial nerve SEPs were recorded during the FBI and analysed using evoked potential (EP) mapping. Tactile mislocalisation was measured using the crossmodal congruency task. SEP mapping revealed five sequential periods of brain activation during the FBI, of which two differed between the illusion condition and the control condition. Activation at 30-50 ms (corresponding to the P40 component) in primary somatosensory cortex was stronger in the illusion condition. A later activation at $110-200 ms, likely originating in higher-tier somatosensory regions in parietal cortex, was stronger and lasted longer in the control condition. These data show that changes in bodily self-consciousness modulate activity in primary and higher-tier somatosensory cortex at two distinct processing steps. We argue that early modulations of primary somatosensory cortex may be a consequence of (1) multisensory integration of synchronous vs. asynchronous visuo-tactile stimuli and/or (2) differences in spatial attention (to near or far space) between the conditions. The later activation in higher-tier parietal cortex (and potentially other regions in temporo-parietal and frontal cortex) likely reflects the detection of visuo-tactile conflicts in the asynchronous condition.

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“…This is of importance for the present study because VV judgments require that the brain detects the visual line's orientation with respect to our body as well as the orientation of our body with respect to gravity (Lopez et al, 2008(Lopez et al, , 2009Luyat et al, 1997;Marendaz, 1998;Mittelstaedt, 1992). Neural processes at this time period have also been shown to depend on the degree of elevation of the visuo-spatial perspective with respect to gravity (Schwabe et al, 2009), or to the participant's own body position (Arzy et al, 2006). Altogether, these high-density EP data suggest that brain mechanisms around 300 ms may represent multisensory integration for object-centered processing as well as for computing the position of one's own body in space (e.g.…”

Section: Early Activity In Temporo-occipital Cortex Related To Visualmentioning

confidence: 95%

“…The neural generators for the EP map related to VV judgments were estimated using a distributed linear inverse solution based on a Local Auto-Regressive Average (LAURA) model as used previously (Gonzalez Andino et al, 2001;Grave de Peralta Menendez et al, 2004). Map topographies were downsampled to a 111-channel montage because the LAURA algorithm we used has been tested extensively for this configuration Schwabe et al, 2009). The solution space was calculated on a realistic head model that included 4024 nodes equally distributed within the gray matter of the Montreal Neurological Institute's average brain.…”

Section: Modulation Of the Strength Of The Electrical Fieldmentioning

confidence: 99%

Spatiotemporal dynamics of visual vertical judgments: early and late brain mechanisms as revealed by high-density electrical neuroimaging

et al. 2011

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Abstract-Constructing and updating an internal model of verticality is fundamental for maintaining an erect posture and facilitating visuo-spatial processing. The judgment of the visual vertical (VV) has been intensively studied in psychophysical investigations and relies mainly on the integration of visual and vestibular signals, although a contribution of postural and somatosensory signals has been reported. Here we used high-density 192-channel evoked potential (EP) mapping and distributed source localization techniques to reveal the neural mechanisms of VV judgments. VV judgments (judging the orientation of visual lines with respect to the subjective vertical) were performed with and without a tilted visual frame. EP mapping revealed a sequence of neural processing steps (EP maps) of which two were specific for VV judgments. An early EP map, observed at ϳ75-105 ms post-stimulus, was localized in right lateral temporo-occipital cortex. A later EP map (ϳ260 -290 ms) was localized in bilateral temporo-occipital and parieto-occipital cortex. These data suggest that early VV-related neural processing involves the lateral and ventral visual stream and is related to visual processing concerning orientation, attention and comparison. The later, more dorsal, activation involves multimodal cortex subtending a constantly available and updated internal model of the vertical that we can refer to for the control of one's posture, actions, and visuo-spatial processing.

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The timing of temporoparietal and frontal activations during mental own body transformations from different visuospatial perspectives

Cited by 33 publications

References 57 publications

Spatial Transformations of Bodies and Objects in Adults with Autism Spectrum Disorder

Spatial Transformations of Bodies and Objects in Adults with Autism Spectrum Disorder

Early and late activity in somatosensory cortex reflects changes in bodily self-consciousness: An evoked potential study

Spatiotemporal dynamics of visual vertical judgments: early and late brain mechanisms as revealed by high-density electrical neuroimaging

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