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In this study, we used a novel virtual-reality task allowing the manipulation of the visual feedback of a motor action across different aspects, to show that the sensitivity of agency is different across aspects. Furthermore, agency judgments are correlated across aspects within subjects and bias toward attributing the viewed action to the self or to an external source is correlated as well. Taken together, our results suggest that sensorimotor prediction mechanisms underlying SoA are related between different aspects and that people have a predisposition for the directionality of agency judgments.

Krugwasser, A. R., Harel, E. V., & Salomon, R. (2019). The Boundaries of the Self: The Sense of Agency Across Different Sensorimotor Aspects. Journal of Vision, 19(4), 14.‏

The Anterior Insula integrates information from inside the body (Interoceptive) and information from the external world (Exteroceptive). In this study we followed up on our previous finding showing that the insula is involved in suppressing from awareness visual stimuli presented synchronously with the heartbeat  (Salomon et al., 2016). Here we tested patients with brain lesions to the insula or other regions, as well as healthy participants on the same experiment. We replicated our previous finding and showed that damage to the anterior insular region eliminates the suppression of cardio-visual stimuli. This shows converging evidence fr the role of the insula in the integration of interoceptive and exteroceptive signals shaping the self model.

Salomon, R., Ronchi, R., Dönz, J., Bello-Ruiz, J., Herbelin, B., Faivre, N., ... & Blanke, O. (2018). Insula mediates heartbeat related effects on visual consciousness. Cortex, 101, 87-95.

Upper limb cortical maps in amputees with targeted muscle and sensory reinnervation

Amputation of a limb is known to cause cortical reorganisation in sensorimotor regions. A novel approach in neuroprosthetics named "Targeted muscle and sensory reinnervation (TMSR)"  consists of rerouting motor and sensory nerves from the residual limb towards intact muscles and skin regions. Movement of a myoelectric prosthesis is enabled via decoded electromyography activity from reinnervated muscles and touch sensation on the missing limb is enabled by stimulation of the reinnervated skin areas. In this paper, (published in Brain ), we investigated using ultra high-field (7 T) fmri how motor control using  TMSR affected the maps of the upper limb in primary motor (M1) and primary somatosensory (S1) cortex,and their functional connections. We found that M1 maps  in TMSR patients were similar  to healthy controls and different from non-TMSR amputees. These results show how that  TMSR may counteract maladaptive cortical plasticity typically found after limb loss in M1. 

Serino, A., Akselrod, M., Salomon, R., Martuzzi, R., Blefari, M. L., Canzoneri, E., ... & Amoresano, A. (2017). Upper limb cortical maps in amputees with targeted muscle and sensory reinnervation. Brain, 140(11), 2993-3011.

No deficit of Body Ownership in Schizophrenia

Schizophrenia patients experience an altered sense of self. For example, they show deficits of Agency in which they feel that an external force is controlling their actions. However, another central aspect of the sense of self, the feeling that one's body belongs to the self (i.e. Body Ownership) has not been thoroughly investigated. In this paper, published in Schizophrenia Bulletin , we show that in a large cohort of chronic schizophrenia patients and controls there is no deficit in their sense of Body Ownership as measured by the Full Body Illusion . We also employed meta-analytical approach to show that there is little evidence for such a deficit in previous research on this topic. This finding gives us a more realistic view of Self related deficits in this population. 

 Shaqiri, A., Roinishvili, M., Kaliuzhna, M., Favrod, O., Chkonia, E., Herzog, M. H., ... & Salomon, R. (2017). Rethinking Body Ownership in Schizophrenia: Experimental and Meta-analytical Approaches Show no Evidence for Deficits. Schizophrenia Bulletin. 

Unconscious mutlisensory integration impacts peripersonal space and bodily self consciousness

In a recent paper by Salomon et al.  published in Cognition  we show how the integration of unconscious multisensory signals modulates both peripersonal space and bodily self consciousnesses.While it has been assumed that these processes are pre-reflexive and do not require any awareness of the underlying sensory signals, this is the first empirical evidence showing that this is the case.

Salomon, R., Noel, J. P., Łukowska, M., Faivre, N., Metzinger, T., Serino, A., & Blanke, O. (2017). Unconscious integration of multisensory bodily inputs in the peripersonal space shapes bodily self-consciousness. Cognition, 166, 174-183.

How does the brain create and maintain the Self?

This review paper outlines the cognitive and neural mechanisms by which the brain creates and maintains models of the self. Specifically, it details my theory of the role of  sensorimotor processing in the formation of the minimal self and how these affect social processes and are disrupted in psychiatric conditions such as psychosis and schizophrenia.

Salomon, R. (2017). The assembly of the self from sensory and motor foundations. Social Cognition, 35(2), 87-106.

Salomon Lab is Hiring!

Interested in Consciousness and the Self? Our new lab is seeking highly motivated students and programmers, to lead our research on perceptual and self consciousness.  To tackle these questions, we use behavioural studies, virtual reality, electrophysiology (EEG/MEG ) and fMRI. Enthusiastic candidates with excellent collaboration skills and backgrounds in Psychology, Neuroscience, Engineering or Computer Sciences are welcome to send a CV to Dr.Roy Salomon  roy.salomon at biu.ac.il 

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The Salomon lab focuses on the cognitive and neural processes underlying perceptual consciousness (i.e. the objects of our experience) and bodily self consciousness (i.e. the subject who is experiencing). We use a combination of virtual reality, physiological signals, psychophysics and neuroimaging (EEG, MEG, fMRI) to study these processes in homo sapiens.

We work both with healthy populations as well as clinical populations showing deficits in self representation (e.g. Schizophrenia & Parkinson's patients). 

There are three things extremely hard: steel, a diamond, and to know one's self. - Benjamin Franklin 

© 2017 by Roy Salomon