scholarly journals Social coding of the multisensory space around us

2019 ◽  
Vol 6 (8) ◽  
pp. 181878 ◽  
Author(s):  
Lise Hobeika ◽  
Marine Taffou ◽  
Isabelle Viaud-Delmon
Keyword(s):  
Multisensory Integration ◽  
Peripersonal Space ◽  
Collective Actions ◽  
Functional Representation ◽  
Space Processing ◽  
Interaction Task ◽  
The Right ◽  
Task Irrelevant ◽  
Individual Motor ◽  
Inactive Individual

Multisensory integration of stimuli occurring in the area surrounding our bodies gives rise to the functional representation of peripersonal space (PPS). PPS extent is flexible according to the affective context and the target of an action, but little is known about how social context modulates it. We used an audiotactile interaction task to investigate PPS of individuals during social interaction. Participants had to detect as fast as possible a tactile stimulus while task-irrelevant looming sounds were presented, while they were paired as collaborative dyads and as competitive dyads. We also measured PPS in participants seated near an inactive individual. PPS boundaries were modulated only when participants collaborated with a partner, in the form of an extension on the right hemispace and independently of the location of the partner. This suggests that space processing is modified during collaborative tasks. During collective actions, a supra-individual representation of the space of action could be at stake in order to adapt our individual motor control to an interaction as a group with the external world. Reassessing multisensory integration in the light of its potential social sensitivity might reveal that low-level mechanisms are modified by the need to interact with others.

scholarly journals Peripersonal space in the front, rear, left and right directions for audio-tactile multisensory integration

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yusuke Matsuda ◽  
Maki Sugimoto ◽  
Masahiko Inami ◽  
Michiteru Kitazaki
Keyword(s):  
Multisensory Integration ◽  
Tactile Stimulus ◽  
Peripersonal Space ◽  
Auditory Information ◽  
Specific Direction ◽  
Left And Right ◽  
Audio Stimulus ◽  
Task Irrelevant

AbstractPeripersonal space (PPS) is important for humans to perform body–environment interactions. However, many previous studies only focused on the specific direction of the PPS, such as the front space, despite suggesting that there were PPSs in all directions. We aimed to measure and compare the peri-trunk PPS in four directions (front, rear, left, and right). To measure the PPS, we used a tactile and an audio stimulus because auditory information is available at any time in all directions. We used the approaching and receding task-irrelevant sounds in the experiment. Observers were asked to respond as quickly as possible when a tactile stimulus was applied to a vibrator on their chest. We found that peri-trunk PPS representations exist with an approaching sound, irrespective of the direction.

Task-Irrelevant Sound Corrects Leftward Spatial Bias in Blindfolded Haptic Placement Task

2020 ◽  
Vol 33 (4-5) ◽  
pp. 521-548
Author(s):  
Laura Cacciamani ◽  
Larisa Sheparovich ◽  
Molly Gibbons ◽  
Brooke Crowley ◽  
Kalynn E. Carpenter ◽  
...  
Keyword(s):  
Memory Task ◽  
Spatial Location ◽  
Dominant Hand ◽  
Spatial Bias ◽  
Leftward Bias ◽  
Object Location Memory ◽  
Irrelevant Sound ◽  
Haptic Object ◽  
The Right ◽  
Task Irrelevant

Abstract We often rely on our sense of vision for understanding the spatial location of objects around us. If vision cannot be used, one must rely on other senses, such as hearing and touch, in order to build spatial representations. Previous work has found evidence of a leftward spatial bias in visual and tactile tasks. In this study, we sought evidence of this leftward bias in a non-visual haptic object location memory task and assessed the influence of a task-irrelevant sound. In Experiment 1, blindfolded right-handed sighted participants used their non-dominant hand to haptically locate an object on the table, then used their dominant hand to place the object back in its original location. During placement, participants either heard nothing (no-sound condition) or a task-irrelevant repeating tone to the left, right, or front of the room. The results showed that participants exhibited a leftward placement bias on no-sound trials. On sound trials, this leftward bias was corrected; placements were faster and more accurate (regardless of the direction of the sound). One explanation for the leftward bias could be that participants were overcompensating their reach with the right hand during placement. Experiment 2 tested this explanation by switching the hands used for exploration and placement, but found similar results as Experiment 1. A third Experiment found evidence supporting the explanation that sound corrects the leftward bias by heightening attention. Together, these findings show that sound, even if task-irrelevant and semantically unrelated, can correct one’s tendency to place objects too far to the left.

scholarly journals Auditory attention alterations in migraine: a behavioral and MEG/EEG study

2019 ◽  
Author(s):  
Rémy Masson ◽  
Yohana Lévêque ◽  
Geneviève Demarquay ◽  
Hesham ElShafei ◽  
Lesly Fornoni ◽  
...  
Keyword(s):  
Event Related Potentials ◽  
Orienting Response ◽  
List Type ◽  
Top Down ◽  
Attention Task ◽  
Bottom Up ◽  
Attentional Processes ◽  
Related Potentials ◽  
The Right ◽  
Task Irrelevant

AbstractObjectivesTo evaluate alterations of top-down and/or bottom-up attention in migraine and their cortical underpinnings.Methods19 migraineurs between attacks and 19 matched control participants performed a task evaluating jointly top-down and bottom-up attention, using visually-cued target sounds and unexpected task-irrelevant distracting sounds. Behavioral responses and MEG/EEG were recorded. Event-related potentials and fields (ERPs/ERFs) were processed and source reconstruction was applied to ERFs.ResultsAt the behavioral level, neither top-down nor bottom-up attentional processes appeared to be altered in migraine. However, migraineurs presented heightened evoked responses following distracting sounds (orienting component of the N1 and Re-Orienting Negativity, RON) and following target sounds (orienting component of the N1), concomitant to an increased recruitment of the right temporo-parietal junction. They also displayed an increased effect of the cue informational value on target processing resulting in the elicitation of a negative difference (Nd).ConclusionsMigraineurs appear to display increased bottom-up orienting response to all incoming sounds, and an enhanced recruitment of top-down attention.SignificanceThe interictal state in migraine is characterized by an exacerbation of the orienting response to attended and unattended sounds. These attentional alterations might participate to the peculiar vulnerability of the migraine brain to all incoming stimuli.HighlightsMigraineurs performed as well as healthy participants in an attention task.However, EEG markers of both bottom-up and top-down attention are increased.Migraine is also associated with a facilitated recruitment of the right temporo-parietal junction.

scholarly journals Response preparation involves a release of intracortical inhibition in task-irrelevant muscles

2020 ◽  
Author(s):  
Isaac N. Gomez ◽  
Kara Ormiston ◽  
Ian Greenhouse
Keyword(s):  
Transcranial Magnetic Stimulation ◽  
Magnetic Stimulation ◽  
Index Finger ◽  
Intracortical Inhibition ◽  
Left Index Finger ◽  
Task Condition ◽  
Response Preparation ◽  
Action Preparation ◽  
The Right ◽  
Task Irrelevant

AbstractAction preparation involves widespread modulation of motor system excitability, but the precise mechanisms are unknown. In this study, we investigated whether intracortical inhibition changes in task-irrelevant muscle representations during action preparation. We used transcranial magnetic stimulation (TMS) combined with electromyography in healthy human adults to measure motor evoked potentials (MEPs) and cortical silent periods (CSPs) in task-irrelevant muscles during the preparatory period of simple delayed response tasks. In Experiment 1, participants responded with the left-index finger in one task condition and the right-index finger in another task condition, while MEPs and CSPs were measured from the contralateral non-responding and tonically contracted index finger. During Experiment 2, participants responded with the right pinky finger while MEPs and CSPs were measured from the tonically contracted left-index finger. In both experiments, MEPs and CSPs were compared between the task preparatory period and a resting intertrial baseline. The CSP duration during response preparation decreased from baseline in every case. A laterality difference was also observed in Experiment 1, with a greater CSP reduction during the preparation of left finger responses compared to right finger responses. MEP amplitudes showed no modulation during movement preparation in any of the three response conditions. These findings indicate cortical inhibition associated with task-irrelevant muscles is transiently released during action preparation and implicate a novel mechanism for the controlled and coordinated release of motor cortex inhibition.New & NoteworthyIn this study we observed the first evidence of a release of intracortical inhibition in task-irrelevant muscle representations during response preparation. We applied transcranial magnetic stimulation to elicit cortical silent periods in task-irrelevant muscles during response preparation and observed a consistent decrease in the silent period duration relative to a resting baseline. These findings address the question of whether cortical mechanisms underlie widespread modulation in motor excitability during response preparation.

Ruling Oneself Out: A Theory of Collective Abdications. By Ivan Ermakoff. Durham, NC: Duke University Press, 2008. 440p. $99.95 cloth, $27.95 paper.

2009 ◽  
Vol 7 (1) ◽  
pp. 164-165
Author(s):  
Ioannis D. Evrigenis
Keyword(s):  
Collective Actions ◽  
Collective Resistance ◽  
Duke University ◽  
The Right

“Why would a group legitimize its own subservience and, in doing so, abdicate its capacity for self-preservation?” is the question asked at the start of Ruling Oneself Out (p. xi). Focusing on the Center Party's vote for the enabling act of March 1933, which gave Hitler the right to amend the Weimar constitution, and on the Vichy parliament's vote to grant full powers to Marshal Philippe Pétain in 1940, Ivan Ermakoff studies how these decisions looked to the actors themselves, and finds that the pervasive uncertainty that characterized the situation leading up to each vote, and the actors' tendency to look to their peers for guidance, complicate monocausal accounts of groups marching to their death. Many prevalent attempts to explain these seemingly inexplicable collective actions tend to emphasize coercion, miscalculation, and collusion. Each of these explanations has its merits, and some are more persuasive than others. Yet each has its problems. Coercion, for example, which is the most compelling explanation of the lot, might lead one to expect those threatened to submit, yet fear just as often causes consolidation and vigorous collective resistance to the challenger.

Visuotactile Representation of Peripersonal Space: A Neural Network Study

2010 ◽  
Vol 22 (1) ◽  
pp. 190-243 ◽  
Author(s):  
Elisa Magosso ◽  
Melissa Zavaglia ◽  
Andrea Serino ◽  
Giuseppe di Pellegrino ◽  
Mauro Ursino
Keyword(s):  
Neural Network ◽  
Peripersonal Space ◽  
Sensitivity Analyses ◽  
Neurological Deficits ◽  
Inhibitory Synapses ◽  
Space Representation ◽  
Emergent Properties ◽  
Bilateral Stimulation ◽  
The Right ◽  
Parameter Values

Neurophysiological and behavioral studies suggest that the peripersonal space is represented in a multisensory fashion by integrating stimuli of different modalities. We developed a neural network to simulate the visual-tactile representation of the peripersonal space around the right and left hands. The model is composed of two networks (one per hemisphere), each with three areas of neurons: two are unimodal (visual and tactile) and communicate by synaptic connections with a third downstream multimodal (visual-tactile) area. The hemispheres are interconnected by inhibitory synapses. We applied a combination of analytic and computer simulation techniques. The analytic approach requires some simplifying assumptions and approximations (linearization and a reduced number of neurons) and is used to investigate network stability as a function of parameter values, providing some emergent properties. These are then tested and extended by computer simulations of a more complex nonlinear network that does not rely on the previous simplifications. With basal parameter values, the extended network reproduces several in vivo phenomena: multisensory coding of peripersonal space, reinforcement of unisensory perception by multimodal stimulation, and coexistence of simultaneous right- and left-hand representations in bilateral stimulation. By reducing the strength of the synapses from the right tactile neurons, the network is able to mimic the responses characteristic of right-brain-damaged patients with left tactile extinction: perception of unilateral left tactile stimulation, cross-modal extinction and cross-modal facilitation in bilateral stimulation. Finally, a variety of sensitivity analyses on some key parameters was performed to shed light on the contribution of single-model components in network behaviour. The model may help us understand the neural circuitry underlying peripersonal space representation and identify its alterations explaining neurological deficits. In perspective, it could help in interpreting results of psychophysical and behavioral trials and clarifying the neural correlates of multisensory-based rehabilitation procedures.

Part III The Legal Framework, 9 Damages

2020 ◽  
Author(s):  
Veljanovski Cento
Keyword(s):  
Legal Framework ◽  
Competition Authority ◽  
Legal Basis ◽  
Collective Actions ◽  
National Courts ◽  
National Competition ◽  
National Competition Authority ◽  
The Uk ◽  
The Right ◽  
Lost Profit

This chapter assesses damages actions for competition infringement. The Damages Directive sets out a common legal basis across the EU for the right of those harmed by a competition infringement to sue and quantification of damages. It has been transposed into the UK and incorporated as Schedule 8A of the Competition Act 1989. The Damages Directive gives the national courts the power to estimate the overcharge; requires the European Commission to issue guidelines on the quantification of overcharges and on ‘pass-on to’; and advises that the national courts can request assistance from a willing national competition authority where appropriate to determine quantum. In English law, the position is that damages are compensatory and aim to place the victim in the position they would have been had they not been injured so far as monetary compensation can. There are several heads or types of damages that have so far been claimed: overcharge damages; lost volume or lost profit damages; run-on damages; umbrella damages; cost-based damages; future losses, lost chance, and lost opportunity damages; and aggregate damages in collective actions.

Turkish Industrial Relations at the Crossroads: Revisiting the History of Industrial Relations in the Early Post World War Two Period

2018 ◽  
Vol 93 ◽  
pp. 151-175 ◽  
Author(s):  
Didem Özkiziltan ◽  
Aziz Çelik
Keyword(s):  
Trade Unions ◽  
Industrial Relations ◽  
The State ◽  
Collective Actions ◽  
World War ◽  
Historical Evidence ◽  
Critical Juncture ◽  
History Of ◽  
Critical Account ◽  
The Right

AbstractThe 1961 constitutional reform in Turkey recognized the right to strike and granted other rights and freedoms related to the collective actions of labor. Conventional wisdom holds that Turkish trade unions became independent of the state power with class-based interests only after this reform. Across mainstream literature, this is considered, in historical institutionalist terms, as the first critical juncture in Turkey's industrial relations. This paper provides a critical account of the institutional continuity, development, and change that took place in Turkey's industrial relations starting from its establishment as a republic in 1923 until the end of the 1950s, by considering the socioeconomic and legal-political environment during these years. Considering the historical evidence employed, and under historical institutionalism, it is argued that the first critical juncture in the country's industrial relations occurred in 1947, when the ruling cliques permitted the establishment of trade unions. In this paper, it is purported that the consensus reached by the trade unions on the necessity of the right to strike from the mid-1950s onwards initiated a peaceful class struggle between Turkish labor and the state, which gradually steered the industrial relations toward the second critical juncture following the promulgation of the 1961 constitution.

scholarly journals Aging and Sensitivity to Illusory Target Motion With or Without Secondary Tasks

2018 ◽  
Vol 31 (3-4) ◽  
pp. 227-249 ◽  
Author(s):  
Alix L. de Dieuleveult ◽  
Anne-Marie Brouwer ◽  
Petra C. Siemonsma ◽  
Jan B. F. van Erp ◽  
Eli Brenner
Keyword(s):  
Older Adults ◽  
Visual Information ◽  
Sensory Information ◽  
Older Individuals ◽  
Younger Adults ◽  
Secondary Tasks ◽  
Healthy Older Adults ◽  
The Right ◽  
Task Irrelevant ◽  
Background Motion

Older individuals seem to find it more difficult to ignore inaccurate sensory cues than younger individuals. We examined whether this could be quantified using an interception task. Twenty healthy young adults (age 18–34) and twenty-four healthy older adults (age 60–82) were asked to tap on discs that were moving downwards on a screen with their finger. Moving the background to the left made the discs appear to move more to the right. Moving the background to the right made them appear to move more to the left. The discs disappeared before the finger reached the screen, so participants had to anticipate how the target would continue to move. We examined how misjudging the disc’s motion when the background moves influenced tapping. Participants received veridical feedback about their performance, so their sensitivity to the illusory motion indicates to what extent they could ignore the task-irrelevant visual information. We expected older adults to be more sensitive to the illusion than younger adults. To investigate whether sensorimotor or cognitive load would increase this sensitivity, we also asked participants to do the task while standing on foam or counting tones. Background motion influenced older adults more than younger adults. The secondary tasks did not increase the background’s influence. Older adults might be more sensitive to the moving background because they find it more difficult to ignore irrelevant sensory information in general, but they may rely more on vision because they have less reliable proprioceptive and vestibular information.

scholarly journals Overconfidence in visual perception in Parkinson’s disease

2020 ◽  
Author(s):  
Orly Halperin ◽  
Roie Karni ◽  
Simon Israeli-Korn ◽  
Sharon Hassin-Baer ◽  
Adam Zaidel
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Young Adult ◽  
Motion Perception ◽  
Multisensory Integration ◽  
Visual Cues ◽  
Visual Motion ◽  
Visual Motion Perception ◽  
The Right ◽  
Future Work

AbstractBackgroundIncreased dependence on visual cues in Parkinson’s disease (PD) can unbalance the perception-action loop, impair multisensory integration, and affect everyday function of PD patients. It is currently unknown why PD patients seem to be more reliant on their visual cues.ObjectivesWe hypothesized that PD patients may be overconfident in the reliability (precision) of their visual cues. In this study we tested coherent visual motion perception in PD, and probed subjective (self-reported) confidence in their visual motion perception.Methods20 patients with idiopathic PD, 21 healthy aged-matched controls and 20 healthy young adult participants were presented with visual stimuli of moving dots (random dot kinematograms). They were asked to report: (1) whether the aggregate motion of dots was to the left or to the right, and (2) how confident they were that their perceptual discrimination was correct.ResultsVisual motion discrimination thresholds were similar (unimpaired) in PD compared to the other groups. By contrast, PD patients were significantly overconfident in their visual perceptual decisions (p=0.002 and p<0.001 vs. the age-matched and young adult groups, respectively).ConclusionsThese results suggest intact visual motion perception, but overestimation of visual cue reliability, in PD. Overconfidence in visual (vs. other, e.g., somatosensory) cues could underlie accounts of increased visual dependence and impaired multisensory integration in PD, and could contribute to gait and balance impairments. Future work should investigate PD confidence in somatosensory function. A better understanding of altered sensory reliance in PD might open up new avenues to treat debilitating symptoms.

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