title: Neural response to modulating the probability that actions of self or other result in auditory tones: A parametric fMRI study into causal ambiguity.
abstract: In normal circumstances we can easily distinguish between changes to the external world brought about by our own actions from those with external causes. However, in certain contexts our sense of ownership and agency over acts is not so clear. Neuroimaging studies have implicated a number of regions in the sense of agency, some of which have been shown to vary continuously with action-outcome discordance. However, little is known about dynamic, ambiguous contexts characterised by a lack of information for self-other differentiation, yet such ambiguous states are important in relation to symptoms and levels of consciousness that characterise certain mental health conditions. With a block-design fMRI paradigm, we investigated neural responses to changes in the probability that a participant's irregular finger taps over 12s would result in auditory tones as opposed to tones generated by 'another's finger taps'. The main findings were that misattribution increased in ambiguous conditions where the probability of a tone belonging to self and other was equal. Task-sensitive brain regions, previously identified in self-agency, motor cognition, and ambiguity processing, showed a quadratic response to our self-to-other manipulation, with particular sensitivity to self-control. Task performance (low error and bias) was related to attenuated response in ambiguous conditions while increased response in regions associated with the default mode network was associated with greater overall error and bias towards other. These findings suggest that causal ambiguity as it occurs over time is a prominent feature in sense of agency, one that may eventually contribute to a more comprehensive understanding of positive symptoms of psychosis.
authors.affiliation: Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom. Electronic address: cedb@liverpool.ac.uk.
authors.forename: Christophe E
authors.initials: CE
authors.lastname: de Bézenac
authors.affiliation: School of Health Sciences, Thompson Yates Building, The Quadrangle, Brownlow Hill, Liverpool L69 3GB, United Kingdom. Electronic address: Vanessa.Sluming@liverpool.ac.uk.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Sluming
authors.affiliation: York Neuroimaging Centre (YNiC), The Biocentre, York Science Park, Heslington, York YO10 5NY, United Kingdom. Electronic address: andre.gouws@ynic.york.ac.uk.
authors.forename: André
authors.initials: A
authors.lastname: Gouws
authors.affiliation: Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom. Electronic address: Rhiannon.Corcoran@liverpool.ac.uk.
authors.forename: Rhiannon
authors.initials: R
authors.lastname: Corcoran
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001921:Brain / Q000502:physiology; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007389:Internal-External Control; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D011336:Probability; D000068356:Self-Control / Q000523:psychology*; D013647:Task Performance and Analysis; D035501:Uncertainty; D055815:Young Adult
keywords: Agency; Causal ambiguity; Parametric design; Prediction error; Self and other; fMRI