Reduced feedback-related negativity amplitude elicited by social and non-social error feedback in traumatic brain injury patients compared with controls
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1
University of New South Wales, Australia
Aims: Acquired social disinhibition after a severe traumatic brain injury (TBI) is often reported to be of the most distressing and disabling outcomes for the individual, their family and the community (Brooks & McKinlay). It has been postulated that reversal learning deficits caused by damage to the orbitofrontal cortex (OFC) may underlie acquired social disinhibition (Rolls, 1994). The current study aimed to determine whether these reversal learning impairments were associated with social disinhibition in a TBI sample. Performance (number of errors) and the feedback-related negativity (FRN) were examined during a social and a non-social reversal learning task.
Method: Participants with TBI (19 males, mean age 46.9 years) and control group (18 males, mean age 45.29 years) completed both a social and non-social reversal learning task. We measured performance and the FRN amplitude elicited by error feedback when reward contingencies changed. Participants were also rated on their level of social disinhibition by two independent, blind raters based on a videotaped interview.
Results: The TBI group made more reversal errors, F(1,36)=4.229, p=.047, η=.105, and produced smaller amplitude FRN’s, F(1,35)=5.028, p=.031, η=.126, across both versions of the task than did the control group. Further, those TBI subjects high on social disinhibition (based on a median split) made more reversal errors on the social task than did TBI subjects low on disinhibition.
Conclusions: In general TBI participants were impaired on both reversal learning tasks indicating an impaired ability to update behaviour following social as well as non-social reward contingency change. TBI participants were also impaired in their neural response, indicating that the FRN provides a marker of these reward contingency reversal impairments. These neural and behavioural impairments may contribute to acquired social disinhibition after TBI.
Keywords:
Traumatic brain injury (TBI),
Feedback-related negativity (FRN),
orbitofrontal cortex (OFC),
Reversal Learning,
social disinhibition
Conference:
Australasian Society for Psychophysiology, Inc, Coffs Harbour, Australia, 26 Nov - 28 Nov, 2014.
Presentation Type:
Oral Presentation
Topic:
Psychophysiology
Citation:
Osborne-Crowley
KL,
McDonald
S and
Rushby
JA
(2014). Reduced feedback-related negativity amplitude elicited by social and non-social error feedback in traumatic brain injury patients compared with controls.
Conference Abstract:
Australasian Society for Psychophysiology, Inc.
doi: 10.3389/conf.fnhum.2014.216.00029
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Received:
23 Oct 2014;
Published Online:
02 Dec 2014.
*
Correspondence:
Ms. Katie L Osborne-Crowley, University of New South Wales, Sydney, New South Wales, Australia, k.osbornecrowley@unsw.edu.au