The majority of scientific studies on consciousness have focused on vision, exploring the cognitive and neural mechanisms of conscious access to visual stimuli. In parallel, studies on bodily consciousness have revealed that bodily (i.e. tactile, proprioceptive, visceral, vestibular) signals are the basis for the sense of self. However, the role of bodily signals in the formation of visual consciousness is not well understood. Here we investigated how body-related visuo-tactile stimulation modulates conscious access to visual stimuli. We used a robotic platform to apply controlled tactile stimulation to the participants’ back while they viewed a dot moving either in synchrony or asynchrony with the touch on their back. Critically, the dot was rendered invisible through continuous flash suppression. Manipulating the visual context by presenting the dot moving on either a body form, or a non-bodily object we show that: (i) conflict induced by synchronous visuo-tactile stimulation in a body context is associated with a delayed conscious access compared to asynchronous visuo-tactile stimulation, (ii) this effect occurs only in the context of a visual body form, and (iii) is not due to detection or response biases. The results indicate that body-related visuo-tactile conflicts impact visual consciousness by facilitating access of non-conflicting visual information to awareness, and that these are sensitive to the visual context in which they are presented, highlighting the interplay between bodily signals and visual experience.
|Number of pages||9|
|State||Published - 1 Jul 2016|
Bibliographical noteFunding Information:
O.B. is supported by the Bertarelli Foundation , the Swiss National Science Foundation , and the European Science Foundation . R.S. was supported by the National Center of Competence in Research (NCCR) “SYNAPSY – The Synaptic Bases of Mental Diseases” financed by the Swiss National Science Foundation (n° 51AU40_125759 ). M.Ł. was supported by the National Science Centre, Poland (Sonata Bis Program, grant 2012/07/E/HS6/01037 , PI: Michał Wierzchoń).
NF is an EPFL Fellow co-funded by Marie Skłodowska-Curie and was supported by the EU Human Brain Project .
© 2015 Elsevier Ltd
- Bodily self-consciousness
- Body illusion
- Continuous flash suppression
- Haptic robotics
- Multisensory integration
- Visual consciousness