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Interoceptive influences on peripersonal space boundary
Full text linkIntegration of body-related signals within the peripersonal space (PPS) contributes to bodily self-awareness. Whereas several studies have shown how individual PPS extension is shaped by external factors, e.g. during interactions with people and objects, no studies have looked at interoceptive influences on PPS extension. We exposed participants to an audio-tactile interaction task, to measure their PPS boundary (Session 1), and to a heartbeat counting task and a time estimation task, to specifically assess their interoceptive accuracy (Session 2). Participants’ traits of private self-consciousness and social anxiety were also evaluated, to account for their possible effect on the relation between interoception and PPS representation. We found that higher interoceptive accuracy specifically predicts narrower PPS boundary. Moreover, this relation is moderated by individual traits of private self-consciousness, but not social anxiety. Extending the concept of interoceptive influences on exteroceptive body representations to PPS, our results, first, support the idea that a dynamic balance between intero-exteroceptive processing might represent a general principle underlying bodily self-awareness; second, they shed light on how interoception may affect also the way we interface with the external world. Finally, showing that, in order for interoceptive accuracy to be effective on the intero-exteroceptive balance, it is important that individuals tend to focus on inner sensations and feelings, our results suggest that a comprehensive intero-exteroceptive model of bodily self-awareness should be (at least) a three-dimensional model that includes individual self-consciousness traits
Reading out bodily cues to predict interactions
No full textSuccessful motor coordination in social interactions requires the rapid interpretation of others' intentions from their actions. Previous research suggests that individuals use early bodily cues, such as movement kinematics and gaze, to predict others' behaviour. However, the motor features critical for signaling or decoding potential motor interactions remain unclear. In this study, we measured the kinematics of a basic motor act - grasping an object - executed with either individualistic (to place) or social (to pass) intentions. Subsequently, we conducted two action prediction tasks to identify bodily markers of (social) intentions. Hand positioning on the object emerged as a key kinematic indicator of the intention to interact with a partner, as shown by kinematic analyses and classification of participants' responses. Eye-tracking analysis revealed the face as the most attended feature during action observation. Notably, these cues were more consistently attended to when observing actions from a frontal - second-person - perspective rather than a lateral - third-person - perspective. Our findings highlight the saliency of hand-object interactions and the face in decoding potential engagement in second-person contexts. They also provide novel evidence for social affordance processing, expressed in action execution and observation, related to potential motor interactions with others. These features in decoding potential engagement in motor interactions
Schizophrenia and the bodily self
No full textDespite the historically consolidated psychopathological perspective, on the one hand, contemporary organicistic psychiatry often highlights abnormalities in neurotransmitter systems like dysregulation of dopamine transmission, neural circuitry, and genetic factors as key contributors to schizophrenia. Neuroscience, on the other, has so far almost entirely neglected the first-person experiential dimension of this syndrome, mainly focusing on high-order cognitive functions, such as executive function, working memory, theory of mind, and the like. An alternative view posits that schizophrenia is a self-disorder characterized by anomalous self-experience and awareness. This view may not only shed new light on the psychopathological features of psychosis but also inspire empirical research targeting the bodily and neurobiological changes underpinning this disorder. Cognitive neuroscience can today address classic topics of phenomenological psychopathology by adding a new level of description, finally enabling the correlation between the first-person experiential aspects of psychiatric diseases and their neurobiological roots. Recent empirical evidence on the neurobiological basis of a minimal notion of the self, the bodily self, is presented. The relationship between the body, its motor potentialities and the notion of minimal self is illustrated. Evidence on the neural mechanisms underpinning the bodily self, its plasticity, and the blurring of self-other distinction in schizophrenic patients is introduced and discussed. It is concluded that brain-body function anomalies of multisensory integration, differential processing of self- and other-related bodily information mediating self-experience, might be at the basis of the disruption of the self disorders characterizing schizophrenia
The role of embodied cognition in action language comprehension in L1 and L2
No full textIn this study we carried out a behavioral experiment comparing action language comprehension in L1 (Italian) and L2 (English). Participants were Italian native speakers who had acquired the second language late (after the age of 10). They performed semantic judgments on L1 and L2 literal, idiomatic and metaphorical action sentences after viewing a video of a hand performing an action that was related or unrelated to the verb used in the sentence. Results showed that responses to literal and metaphorical L1 sentences were faster when the action depicted was related to the verb used rather than when the action depicted was unrelated to the verb used. No differences were found for the idiomatic condition. In L2 we found that all responses to the three conditions were facilitated when the action depicted was related to the verb used. Moreover, we found that the difference between the unrelated and the related modalities was greater in L2 than in L1 for the literal and the idiomatic condition but not for the metaphorical condition. These findings are consistent with the embodied cognition hypothesis of language comprehension
A sensorimotor network for the bodily self.
No full textNeuroscientists and philosophers, among others, have long
questioned the contribution of bodily experience to the constitution of self-consciousness. Contemporary research answers this question by focusing on the notions of sense of agency and/or sense of ownership. Recently, however, it has been proposed that the bodily self might also be rooted in bodily motor experience, that is, in the experience of oneself as instantiating a bodily structure that enables a specific range of actions. In the current fMRI study, we tested this hypothesis by making participants
undergo a hand laterality judgment task, which is known to be solved by simulating a motor rotation of oneʼs own hand. The stimulus to be judged was either the participant
ʼs own hand or the hand of a stranger. We used this task
to investigate whether mental rotation of pictures depicting
oneʼs own hands leads to a different activation of the sensorimotor areas as compared with the mental rotation of pictures depicting anotherʼs hand. We revealed a neural network for the general representation of the bodily self encompassing the SMA and pre-SMA, the anterior insula, and the occipital cortex, bilaterally. Crucially, the representation of oneʼs own dominant hand turned out to be primarily confined to the left premotor cortex. Our data seem to support the existence of a sense of bodily self encased within the sensorimotor system.
We propose that such a sensorimotor representation of the
bodily self might help us to differentiate our own body from
that of others
From breaking bread to breaking hearts: embodied simulation and action language comprehension
No full textIn this study, we conducted a behavioural experiment using literal, idiomatic, conventional and novel metaphorical action sentences. Participants viewed an action video, immediately after a sentence containing a verb that did (matching modality) or did not (mismatching modality) match the observed action. All the sentences were presented both in the matching modality and the mismatching modality. Participants had to indicate whether the sentence made sense or not by pressing a designated response key. We recorded participants' reaction times and accuracy. We found no significant differences between the matching and mismatching modality in the idiomatic condition. Instead, we found a facilitation effect for the literal and the metaphorical conventional condition in the matching modality compared to the mismatching modality and an interference effect for the metaphorical novel condition in the matching modality compared to the mismatching modality. We interpret these findings in light of the Embodied Cognition approach to language
From Virtual Reality to Neuroscience and Back: a Use Case on Peripersonal Hand Space Plasticity
No full textThe human brain does not represent space homogeneously, but it constructs multiple representations of it depending on the source of sensory stimulation and the nature of interaction between the body and the environment. The peripersonal space is defined as an imaginary area coded as separated sector of space, as if there were a boundary between what the body might or might not interact with. We present an experimental pattern that combines the use of virtual reality (VR) and functional magnetic resonance imaging (fMRI) to investigate human behavior and neural basis in case of training of the plasticity of the peripersonal space around the hand. The expected results may provide knowledge on a phenomenon interesting for behavioral neuroscience as well as for the interaction of embodied self-avatars in virtual environments
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