Paradoxical extension into the contralesional hemispace in spatial neglect

Lenggenhager, Bigna; Loetscher, Tobias; Kavan, Nicole; Pallich, Gianandrea; Brodtmann, Amy; Nicholls, Michael E. R.; Brugger, Peter

doi:10.1016/j.cortex.2011.10.003

Cited by 9 publications

(7 citation statements)

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“…The limited extent of the skin could serve as boundary, potentially provoking a rebound or cessation of the motion. Similarly, for visual stimuli it has been shown that a forward displacement decreased or even reversed when a target stimulus was approaching a boundary with the backward displacement increasing as a function of distance from said boundary (Hubbard & Motes, 2005), dubbed "framing effect" in Lenggenhager et al (2012Lenggenhager et al ( , p. 1325. Thus, it is possible that the wrist and the elbow are perceived as boundaries at which the movement direction would be reversed.…”

Section: Discussionmentioning

confidence: 99%

“…Especially in the field investigating non-veridical perceptions, crossmodal comparisons may be helpful to uncover underlying mechanisms (Christopher Bill & Teft, 1972;Helson, 1930;Sarrazin, Giraudo, & Pittenger, 2005). Evidence of a tactile RM would allow to disentangle body-centered and space-centered frames of references, which is relevant for patients with spatial processing deficits, in whom RM has previously been shown to be altered (Lenggenhager et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Tactile motion lacks momentum

Macauda

Lenggenhager

Meier

et al. 2017

Psychological Research

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The displacement of the final position of a moving object in the direction of the observed motion path, i.e. an overestimation, is known as Representational Momentum. It has been described both in the visual and auditory modality, and is suggested to be modality-independent.Here, we tested whether a Representational Momentum can also be demonstrated in the somatosensory domain. While the cognitive literature on Representational Momentum suggests that it can, previous work on the psychophysics of tactile motion perception would rather predict an underestimation of the perceived endpoint of a tactile stimulus. Tactile motion stimuli were applied on the left and the right dorsal forearms of 32 healthy participants, who were asked to indicate the subjectively perceived endpoint of the stimulation. Velocity and direction of the trajectory was varied. Contrary to the prediction based on the Representational Momentum literature, participants in our experiment significantly displaced the endpoint against the direction of movement (underestimation). The results are thus compatible with previous psychophysical findings on the perception of tactile motion. Further studies combining paradigms from classical psychophysics and cognitive psychology will be needed to resolve the apparently paradoxical predictions by the two literatures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tactile motion lacks momentum

Macauda

Lenggenhager

Meier

et al. 2017

Psychological Research

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“…This disproportionate leftward extension may reflect a distorted representation of extra-personal space, or of the “spatial medium” [discussion in Vallar (2009)]. Paradoxical disproportionate leftward extensions by right-brain-damaged patients with left spatial neglect in variants of the line bisection task have been repeatedly reported [Bisiach et al (1994) setting the endpoints of a line, given its midpoint; Gallace et al (2008), for related evidence; see also converging findings evidence in Lenggenhager et al (2012), using moving stimuli]. In these studies, disproportionate leftward extensions, however, were found in patients with left neglect, and with different tasks.…”

Section: Introductionmentioning

confidence: 95%

Hyperschematia after right brain damage: a meaningful entity?

Rode

Ronchi

Revol

et al. 2014

Front. Hum. Neurosci.

109

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In recent years we reported three right-brain-damaged patients, who exhibited a left-sided disprortionate expansion of drawings, both by copying and from memory, contralateral to the side of the hemispheric lesion (Neurology, 67: 1801, 2006, Neurocase 14: 369, 2008). We proposed the term “hyperschematia” for such an expansion, with reference to an interpretation in terms of a lateral leftward distortion of the representation of extra-personal space, with a leftward anisometric expansion (relaxation) of the spatial medium. The symptom-complex shown by right-brain-damaged patients with “hyperschematia” includes: (1) a disproportionate leftward expansion of drawings (with possible addition of details), by copy and from memory (also in clay modeling, in one patient); (2) an overestimation of left lateral extent, when a leftward movement is required, associated in some patients with a perceptual underestimation; (3) unawareness of the disorder; (4) no unilateral spatial neglect. In most right-brain-damaged patients, left “hyperschematia” involves extra-personal space. In one patient the deficit was confined to a body part (left half-face: personal “hyperschematia”). The neural underpinnings of the disorder include damage to the fronto-temporo-parietal cortices, and subcortical structures in the right cerebral hemisphere, in the vascular territory of the middle cerebral artery. Here, four novel additional patients are reported. Finally, “hypeschematia” is reconsidered, in its clinical components, the underlying pathological mechanisms, as well as its neural underpinnings.

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“…In this view, damage, malfunctioning or altered feedback from and toward the body matrix may be involved in the etiology of different clinical conditions (Riva, 2016a), from neurological disorders like neglect (Lenggenhager et al, 2012; Bolognini et al, 2016) and chronic pain (Tsay et al, 2015; Di Lernia et al, 2016b) to psychiatric disorders like schizophrenia (Ferri et al, 2014; Postmes et al, 2014), depression (Wheatley et al, 2007; Barrett et al, 2016), depersonalization/derealization disorder (Simeon et al, 2000; Jáuregui Renaud, 2015) and eating disorders (Riva et al, 2013; Riva, 2014, 2016b; Dakanalis et al, 2016; Serino et al, 2016a). …”

Section: The Body Matrixmentioning

confidence: 99%

Embodied Medicine: Mens Sana in Corpore Virtuale Sano

Riva

Serino

Lernia

et al. 2017

Front. Hum. Neurosci.

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Progress in medical science and technology drastically improved physicians’ ability to interact with patient’s physical body. Nevertheless, medicine still addresses the human body from a Hippocratic point of view, considering the organism and its processes just as a matter of mechanics and fluids. However, the interaction between the cognitive neuroscience of bodily self-consciousness (BSC), fundamentally rooted in the integration of multisensory bodily inputs, with virtual reality (VR), haptic technologies and robotics is giving a new meaning to the classic Juvenal’s latin dictum “Mens sana in corpore sano” (a healthy mind in a healthy body). This vision provides the basis for a new research field, “Embodied Medicine”: the use of advanced technologies for altering the experience of being in a body with the goal of improving health and well-being. Up to now, most of the research efforts in the field have been focused upon how external bodily information is processed and integrated. Despite the important results, we believe that existing bodily illusions still need to be improved to enhance their capability to effectively correct pathological dysfunctions. First, they do not follow the suggestions provided by the free-energy and predictive coding approaches. More, they lacked to consider a peculiar feature of the human body, the multisensory integration of internal inputs (interoceptive, proprioceptive and vestibular) that constitute our inner body dimension. So, a future challenge is the integration of simulation/stimulation technologies also able to measure and modulate this internal/inner experience of the body. Finally, we also proposed the concept of “Sonoception” as an extension of this approach. The core idea is to exploit recent technological advances in the acoustic field to use sound and vibrations to modify the internal/inner body experience.

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Paradoxical extension into the contralesional hemispace in spatial neglect

Cited by 9 publications

References 50 publications

Tactile motion lacks momentum

Tactile motion lacks momentum

Hyperschematia after right brain damage: a meaningful entity?

Embodied Medicine: Mens Sana in Corpore Virtuale Sano

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