Towards explaining spatial touch perception: Weighted integration of multiple location codes

Badde, Stephanie; Heed, Tobias

doi:10.1080/02643294.2016.1168791

Cited by 68 publications

(80 citation statements)

References 147 publications

(221 reference statements)

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“…In this section, we will review evidence from individuals with different dysynchiric phenomena (including allochiria and synchiria) and discuss how these and other findings provide evidence for interhemispheric involvement in representing touch (see also Tame, Braun, Holmes, & Pavani, 2016). Next, synchiric phenomena and other aspects of tactile sensation are influenced by body position in external space (for a review, see Badde & Heed, 2016). We will briefly discuss how representations of external space may influence tactile performance, focusing on evidence from brain-damaged individuals.…”

Section: Localizing Touch: Mirror Errors and External Spacementioning

confidence: 99%

What can errors tell us about body representations?

Medina

Coslett

2016

Cognitive Neuropsychology

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After an organism is touched, various processes need to occur to accurately localize touch on the body. In this review, we examine how tactile misperceptions can provide evidence regarding the functional organization of body representations. First, we propose that tactile detection and localization are serial processes, in contrast to hypotheses that propose separable parallel processes based on patients with numbsense. Second, we discuss how information in primary somatosensory maps project to representations of body size and shape (body form) in order to localize touch on the skin surface. Using this as a framework, we examine how responses after use-dependent plasticity reflect changes in this mapping, and propose potential mechanisms that could be used minimize tactile localization error in conditions with increased sensory uncertainty. Third, we review situations in which our representation of body form is inconsistent with our actual body shape, specifically discussing phantom limb phenomena and alterations of perceived body size and shape in normal individuals. We discuss problems with the traditional remapping hypothesis of referred sensations in amputees, factors that modulate our perception of body size and shape, and how changes in perceived body form influence tactile localization. Finally, we review studies in which brain-damaged individuals perceive touch on the opposite side of the body, and demonstrate how interhemispheric mechanisms can give rise to these anomalous percepts.

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Section: Localizing Touch: Mirror Errors and External Spacementioning

confidence: 99%

What can errors tell us about body representations?

Medina

Coslett

2016

Cognitive Neuropsychology

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“…Tactile spatial processing, such as localizing a touch to the hand, is inherently multisensory, it requires the integration of somatosensory information about the touched skin patch with visual and proprioceptive information about the current body posture [Azañón, Longo, Soto‐Faraco, & Haggard, ; Medina & Coslett, ; Spence & Driver, ]. This integration links the anatomical skin‐based coordinates of a touch to an external‐spatial location [reviewed in Badde & Heed, ], likely coded within an eye‐centered frame of reference [Heed, Backhaus, Röder, & Badde, ].…”

Section: Introductionmentioning

confidence: 99%

Visual and Proprioceptive Influences on Tactile Spatial Processing in Adults with Autism Spectrum Disorders

et al. 2019

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Children with autism spectrum disorders (ASDs) often exhibit altered representations of the external world. Consistently, when localizing touch, children with ASDs were less influenced than their peers by changes of the stimulated limb's location in external space [Wada et al., Scientific Reports 2015, 4(1), 5985]. However, given the protracted development of an external‐spatial dominance in tactile processing in typically developing children, this difference might reflect a developmental delay rather than a set suppression of external space in ASDs. Here, adults with ASDs and matched control‐participants completed (a) the tactile temporal order judgment (TOJ) task previously used to test external‐spatial representation of touch in children with ASDs and (b) a tactile‐visual cross‐modal congruency (CC) task which assesses benefits of task‐irrelevant visual stimuli on tactile localization in external space. In both experiments, participants localized tactile stimuli to the fingers of each hand, while holding their hands either crossed or uncrossed. Performance differences between hand postures reflect the influence of external‐spatial codes. In both groups, tactile TOJ‐performance markedly decreased when participants crossed their hands and CC‐effects were especially large if the visual stimulus was presented at the same side of external space as the task‐relevant touch. The absence of group differences was statistically confirmed using Bayesian statistical modeling: adults with ASDs weighted external‐spatial codes comparable to typically developed adults during tactile and visual‐tactile spatio‐temporal tasks. Thus, atypicalities in the spatial coding of touch for children with ASDs appear to reflect a developmental delay rather than a stable characteristic of ASD. Autism Res 2019, 12: 1745–1757. © 2019 International Society for Autism Research, Wiley Periodicals, Inc. Lay Summary A touched limb's location can be described twofold, with respect to the body (right hand) or the external world (right side). Children and adolescents with autism spectrum disorder (ASD) reportedly rely less than their peers on the external world. Here, adults with and without ASDs completed two tactile localization tasks. Both groups relied to the same degree on external world locations. This opens the possibility that the tendency to relate touch to the external world is typical in individuals with ASDs but emerges with a delay.

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“…Gray, Spry, & Spence, 2005). Because tactile remapping is a dynamic and constructive process mediated by different sensory and cognitive factors (see Badde & Heed, 2016, for a recent review), tactile selectivity might operate according to different reference frames depending on the remapping phase that characterizes the processing stages upon which it operates (e.g., Spence & Gallace, 2007).…”

Section: Introductionmentioning

confidence: 99%

Hand distance modulates the electrophysiological correlates of target selection during a tactile search task

2018

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This study investigated whether the N140cc ERP component, described as a possible electrophysiological marker of target selection in touch, was modulated by body posture. Participants performed a tactile search task in which they had to localize a tactile target, presented to the left or right hand, while a simultaneous distractor was delivered to the opposite hand. Importantly, the distance between target and distractor (hands separation) was manipulated in different experimental conditions (near vs. far hands). Results showed reduced errors and enhanced amplitudes of the late N140cc when the hands were far apart than in close proximity. This suggests that the competition between target and distractor is stronger when the hands are close together in the near condition, resulting in a degraded selection process. These findings confirm that the N140cc reflects target selection during the simultaneous presentation of competing stimuli and demonstrate for the first time that the attentional mechanisms indexed by this ERP component are based at least in part on postural representations of the body.

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Towards explaining spatial touch perception: Weighted integration of multiple location codes

Cited by 68 publications

References 147 publications

What can errors tell us about body representations?

What can errors tell us about body representations?

Visual and Proprioceptive Influences on Tactile Spatial Processing in Adults with Autism Spectrum Disorders

Hand distance modulates the electrophysiological correlates of target selection during a tactile search task

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