Investigating the 'latent' deficit hypothesis : age at time of head injury, executive and implicit functions and behavioral insight

BARKER, Lynne, ANDRADE, Jackie, MORTON, Nicholas, ROMANOWSKI, Charles and BOWLES, David (2010). Investigating the 'latent' deficit hypothesis : age at time of head injury, executive and implicit functions and behavioral insight. Neuropsychologia, 48 (9), 2550-2563.

[img]
Preview
PDF
Download (738kB) | Preview
    Link to published version:: 10.1016/j.neuropsychologia.2010.05.001

    Abstract

    This study investigated the 'latent deficit' hypothesis in two groups of frontotemporal headinjured patients, those injured prior to steep morphological and corresponding functional maturational periods for frontotemporal networks (≤ age 25), and those injured >28 years. The latent deficit hypothesis proposes that early injuries produce enduring cognitive deficits manifest later in the lifespan with graver consequences for behavior than adult injuries, particularly after frontal pathology (Eslinger, Grattan, Damasio & Damasio, 1992). Implicit and executive deficits both contribute to behavioral insight after frontotemporal head injury (Barker, Andrade, Romanowski, Morton & Wasti, 2006). On the basis of morphological and behavioral data, we hypothesised that early injury would confer greater vulnerability to impairment on tasks associated with frontotemporal regions than later injury. Patients completed experimental tasks of implicit cognition, executive function measures and the DEX measure of behavioural insight (Behavioral Assessment of the Dysexecutive Syndrome: Wilson, Alderman, Burgess, Emslie, & Evans, 1996). The Early Injury group were more impaired on implicit cognition tasks compared to controls that Late Injury patients. There were no marked group differences on most executive function measures. Executive ability only contributed to behavioral awareness in the Early Injury Group. Findings showed that age at injury moderates the relationship between executive and implicit cognition and behavioral insight and that early injuries result in longstanding deficits to functions associated with frontotemporal regions partially supporting the latent deficit hypothesis.

    Item Type: Article
    Research Institute, Centre or Group: Psychology Research Group
    Identification Number: 10.1016/j.neuropsychologia.2010.05.001
    Depositing User: Lynne Barker
    Date Deposited: 24 Sep 2012 16:09
    Last Modified: 24 Sep 2012 16:09
    URI: http://shura.shu.ac.uk/id/eprint/6063

    Actions (login required)

    View Item

    Downloads

    Downloads per month over past year

    View more statistics