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https://www.readbyqxmd.com/read/28222382/corporeal-illusions-in-chronic-spinal-cord-injuries
#1
Michele Scandola, Salvatore Maria Aglioti, Renato Avesani, Gianettore Bertagnoni, Anna Marangoni, Valentina Moro
While several studies have investigated corporeal illusions in patients who have suffered from a stroke or undergone an amputation, only anecdotal or single case reports have explored this phenomenon after spinal cord injury. Here we examine various different types of bodily misperceptions in a comparatively large group of 49 people with spinal cord injury in the post-acute and chronic phases after the traumatic lesion onset. An extensive battery of questionnaires concerning a variety of body related feelings was administered and the results were correlated to the main clinical variables...
February 17, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28222235/visual-appearance-of-a-virtual-upper-limb-modulates-the-temperature-of-the-real-hand-a-thermal-imaging-study-in-immersive-virtual-reality
#2
G Tieri, A Gioia, M Scandola, E F Pavone, S M Aglioti
To explore the link between Sense of Embodiment (SoE) over a virtual hand and physiological regulation of skin temperature, twenty-four healthy participants were immersed in virtual reality through a Head Mounted Display and had their real limb temperature recorded by means of a high-sensitivity infrared camera. Participants observed a virtual right upper limb (appearing either normally, or with the hand detached from the forearm) or limb-shaped non-corporeal control objects (continuous or discontinuous wooden blocks) from a first-person perspective...
February 21, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28220342/icons-for-health-effects-of-cigarette-smoke-a-test-of-semiotic-type
#3
Allison J Lazard, Annie Schmidt, Huyen Vu, M Justin Byron, Ellen Peters, Marcella H Boynton, Noel T Brewer
We sought to identify icons to effectively communicate health harms of chemicals in cigarette smoke. Participants were a convenience sample of 701 U.S. adults. A within-subjects online experiment explored the effects of icon semiotic type: symbolic (arbitrary, most abstract), indexical, and iconic (representative, most concrete). Outcomes were perceived representation, affect toward smoking, elaboration, perceived severity, and perceived effectiveness. For not-easy-to-visualize harms of cancer and addiction, symbolic icons received the highest ratings (all p < ...
February 20, 2017: Journal of Behavioral Medicine
https://www.readbyqxmd.com/read/28219262/individual-differences-in-the-flexibility-of-peripersonal-space
#4
Samuel B Hunley, Arwen M Marker, Stella F Lourenco
The current study investigated individual differences in the flexibility of peripersonal space (i.e., representational space near the body), specifically in relation to trait claustrophobic fear (i.e., fear of suffocating or being physically restricted). Participants completed a line bisection task with either a laser pointer (Laser condition), allowing for a baseline measure of the size of one's peripersonal space, or a stick (Stick condition), which produces expansion of one's peripersonal space. Our results revealed that individuals high in claustrophobic fear had larger peripersonal spaces than those lower in claustrophobic fear, replicating previous research...
January 2017: Experimental Psychology
https://www.readbyqxmd.com/read/28215821/holistic-versus-feature-based-binding-in-the-medial-temporal-lobe
#5
Rebecca N van den Honert, Gregory McCarthy, Marcia K Johnson
A central question for cognitive neuroscience is how feature-combinations that give rise to episodic/source memories are encoded in the brain. Although there is much evidence that the hippocampus (HIP) is involved in feature binding, and some evidence that other brain regions are as well, there is relatively little evidence about the nature of the resulting representations in different brain regions. We used multivoxel pattern analysis (MVPA) to investigate how feature combinations might be represented, contrasting two possibilities, feature-based versus holistic...
January 23, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28215558/optimal-degrees-of-synaptic-connectivity
#6
Ashok Litwin-Kumar, Kameron Decker Harris, Richard Axel, Haim Sompolinsky, L F Abbott
Synaptic connectivity varies widely across neuronal types. Cerebellar granule cells receive five orders of magnitude fewer inputs than the Purkinje cells they innervate, and cerebellum-like circuits, including the insect mushroom body, also exhibit large divergences in connectivity. In contrast, the number of inputs per neuron in cerebral cortex is more uniform and large. We investigate how the dimension of a representation formed by a population of neurons depends on how many inputs each neuron receives and what this implies for learning associations...
February 16, 2017: Neuron
https://www.readbyqxmd.com/read/28213081/-user-committees-within-health-centres
#7
Régine Raymond, Agnès Borgia, Yannick Ruelle
The legislative and regulatory arsenal has resulted in the gradual increase of the involvement of users of the health system within supervisory decision-making bodies and hospitals. In the field of primary care, this representation in the form of user committees is not regulated, but some historical examples exist. The advantage of implementing a health democracy in primary care structures is however real and must be developed.
January 2017: Soins; la Revue de Référence Infirmière
https://www.readbyqxmd.com/read/28212526/can-you-feel-the-body-that-you-see-on-the-relationship-between-interoceptive-accuracy-and-body-image
#8
Giorgia Zamariola, Flavia Cardini, Emanuel Mian, Andrea Serino, Manos Tsakiris
Interoception and exteroception for body signals are two different ways of perceiving the self: the first from within, the second from outside. We investigated the relationship between Interoceptive Accuracy (IAcc) and external perception of the body and we tested if seeing the body from an external perspective can affect IAcc. Fifty-two healthy female subjects performed a standard heartbeat perception task to assess the IAcc, before and after the Body Image Revealer (BIR), which is a body perception task designed to assess the different aspects of body-image...
February 14, 2017: Body Image
https://www.readbyqxmd.com/read/28211036/unconscious-phantasy-as-a-structural-principle-and-organizer-of-mental-life-the-evolution-of-a-concept-from-freud-to-klein-and-some-of-her-successors
#9
Heinz Weiss
Starting with Freud's discovery of unconscious phantasy as a means of accessing his patients' internal world, the author discusses the evolution of the concept in the work of Melanie Klein and some of her successors. Whereas Freud sees phantasy as a wish fulfilling imagination, dominated by primary process functioning and kept apart from reality testing, Klein understands phantasies as a structural function and organizer of mental life. From their very beginnings they involve object relations and gradually evolve from primitive body-near experiences to images and symbolic representations...
February 17, 2017: International Journal of Psycho-analysis
https://www.readbyqxmd.com/read/28205054/distorted-body-representations-are-robust-to-differences-in-experimental-instructions
#10
Luigi Tamè, Nicola Bumpus, Sally A Linkenauger, Matthew R Longo
Several recent reports have shown that even healthy adults maintain highly distorted representations of the size and shape of their body. These distortions have been shown to be highly consistent across different study designs and dependent measures. However, previous studies have found that visual judgments of size can be modulated by the experimental instructions used, for example, by asking for judgments of the participant's subjective experience of stimulus size (i.e., apparent instructions) versus judgments of actual stimulus properties (i...
February 15, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28203635/grounded-understanding-of-abstract-concepts-the-case-of-stem-learning
#11
REVIEW
Justin C Hayes, David J M Kraemer
Characterizing the neural implementation of abstract conceptual representations has long been a contentious topic in cognitive science. At the heart of the debate is whether the "sensorimotor" machinery of the brain plays a central role in representing concepts, or whether the involvement of these perceptual and motor regions is merely peripheral or epiphenomenal. The domain of science, technology, engineering, and mathematics (STEM) learning provides an important proving ground for sensorimotor (or grounded) theories of cognition, as concepts in science and engineering courses are often taught through laboratory-based and other hands-on methodologies...
2017: Cogn Res Princ Implic
https://www.readbyqxmd.com/read/28202502/narrative-empathy-and-illness-memoirs-arthur-frank-s-at-the-will-of-the-body-and-kathlyn-conway-s-ordinary-life
#12
Rosalia Baena
This article analyses the concept of narrative empathy in illness memoirs. These texts negotiate the narrative identity of an autobiographer as he or she recounts the disruptive experience of illness, an experience in which physical and emotional traces dramatically and definitively shape our sense of self. While narrative emotions are certainly deployed in these autobiographies in order to connect with the readers and promote social change, this empathic connection is not so much aimed at arousing compassion but rather more positive emotions on the experience of illness...
February 15, 2017: Medical Humanities
https://www.readbyqxmd.com/read/28196766/projecting-the-self-outside-the-body-body-representations-underlying-proprioceptive-imagery
#13
Nataşa Ganea, Matthew R Longo
Recent research has shown that proprioception relies on distorted representations of body size and shape. By asking participants to localise multiple landmarks on their occluded hand, perceptual maps of hand size and shape can be constructed and compared to actual hand structure. These maps are different from the actual size and shape of the occluded hand, revealing underestimation of finger length and overestimation of hand width. Here we tested whether the same distorted body model underlies proprioceptive imagery (i...
February 11, 2017: Cognition
https://www.readbyqxmd.com/read/28196765/visual-illusion-of-tool-use-recalibrates-tactile-perception
#14
Luke E Miller, Matthew R Longo, Ayse P Saygin
Brief use of a tool recalibrates multisensory representations of the user's body, a phenomenon called tool embodiment. Despite two decades of research, little is known about its boundary conditions. It has been widely argued that embodiment requires active tool use, suggesting a critical role for somatosensory and motor feedback. The present study used a visual illusion to cast doubt on this view. We used a mirror-based setup to induce a visual experience of tool use with an arm that was in fact stationary...
February 11, 2017: Cognition
https://www.readbyqxmd.com/read/28193488/validation-of-periodic-fmri-signals-in-response-to-wearable-tactile-stimulation
#15
Ching-Fu Chen, Kenneth Kreutz-Delgado, Martin I Sereno, Ruey-Song Huang
To map cortical representations of the body, we recently developed a wearable technology for automatic tactile stimulation in human functional magnetic resonance imaging (fMRI) experiments. In a two-condition block design experiment, air puffs were delivered to the face and hands periodically. Surface-based regions of interest (S-ROIs) were initially identified by thresholding a linear statistical measure of signal-to-noise ratio of periodic response. Across subjects, S-ROIs were found in the frontal, primary sensorimotor, posterior parietal, insular, temporal, cingulate, and occipital cortices...
February 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28185328/where-is-the-subjective-straight-ahead-in-williams-syndrome
#16
A Saj, J Heiz, K Barisnikov
BACKGROUND: Individuals with Williams Syndrome (WS) are known to have particular difficulties when performing visuo-spatial tasks, which could be related to their difficulties in using a specific reference system to determine spatial relations. The aim of the present study was to assess the internal representation of the body's sagittal plane, which is an important benchmark for an egocentric frame of reference. METHOD: The results of 18 WS individuals (mean age = 20...
February 10, 2017: Journal of Intellectual Disability Research: JIDR
https://www.readbyqxmd.com/read/28183973/solving-the-quantum-many-body-problem-with-artificial-neural-networks
#17
Giuseppe Carleo, Matthias Troyer
The challenge posed by the many-body problem in quantum physics originates from the difficulty of describing the nontrivial correlations encoded in the exponential complexity of the many-body wave function. Here we demonstrate that systematic machine learning of the wave function can reduce this complexity to a tractable computational form for some notable cases of physical interest. We introduce a variational representation of quantum states based on artificial neural networks with a variable number of hidden neurons...
February 10, 2017: Science
https://www.readbyqxmd.com/read/28179477/perceptual-precision-of-passive-body-tilt-is-consistent-with-statistically-optimal-cue-integration
#18
Koeun Lim, Faisal Karmali, Keyvan Nicoucar, Daniel M Merfeld
When making perceptual decisions, humans have been shown to optimally integrate independent noisy multisensory information - matching maximum likelihood (ML) limits. Such ML estimators provide a theoretic limit to perceptual precision (i.e., minimal thresholds). However, how the brain combines two interacting (i.e., not independent) sensory cues remains an open question. To study the precision achieved when combining interacting sensory signals, we measured perceptual roll tilt and roll rotation thresholds between 0 and 5Hz in 6 normal human subjects...
February 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28175962/sex-specific-effects-of-posture-on-the-attribution-of-handedness-to-an-imagined-agent
#19
Daniele Marzoli, Chiara Lucafò, Carmine Rescigno, Elena Mussini, Caterina Padulo, Giulia Prete, Anita D'Anselmo, Gianluca Malatesta, Luca Tommasi
In a series of previous studies, we found that when participants were required to imagine another person performing a manual action, they imagined a significantly higher proportion of actions performed with their dominant rather than non-dominant hand, which indicates that shared motor representations between the self and the other are involved also during the imagination of others' actions. Interestingly, the activation of lateralized body-specific motor representations (as indexed by the congruence between the participant's handedness and the imagined person's handedness) appeared to be affected by the visual perspective adopted and participants' handedness...
February 7, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28163007/vestibular-contributions-to-high-level-sensorimotor-functions
#20
W Pieter Medendorp, Luc J P Selen
The vestibular system, which detects motion and orientation of the head in space, is known to be important in controlling gaze to stabilize vision, to ensure postural stability and to provide our sense of self-motion. While the brain's computations underlying these functions are extensively studied, the role of the vestibular system in higher level sensorimotor functions is less clear. This review covers new research on the vestibular influence on perceptual judgments, motor decisions, and the ability to learn multiple motor actions...
February 2, 2017: Neuropsychologia
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