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Review
Brain mechanisms underlying apathy
  1. Campbell Le Heron1,2,3,
  2. Clay B Holroyd4,
  3. John Salamone5,
  4. Masud Husain1,2,6,7
  1. 1 Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK
  2. 2 Department of Experimental Psychology, University of Oxford, Oxford, UK
  3. 3 New Zealand Brain Research Institute, Christchurch, New Zealand
  4. 4 Department of Psychology, University of Victoria, Victoria, British Columbia, Canada
  5. 5 Department of Psychological Sciences, University of Connecticut, Storrs, Connecticut, USA
  6. 6 Division of Clinical Neurology, John Radcliffe Hospital, Oxford University Hospitals Trust, Oxford, UK
  7. 7 Wellcome Trust Centre for Integrative Neuroimaging, Oxford, UK
  1. Correspondence to Dr Campbell Le Heron, New Zealand Brain Research Institute, Christchurch 8011, New Zealand; campbell.leheron{at}ndcn.ox.ac.uk

Abstract

The past few decades have seen growing interest in the neuropsychiatric syndrome of apathy, conceptualised as a loss of motivation manifesting as a reduction of goal-directed behaviour. Apathy occurs frequently, and with substantial impact on quality of life, in a broad range of neurological and psychiatric conditions. Apathy is also consistently associated with neuroimaging changes in specific medial frontal cortex and subcortical structures, suggesting that disruption of a common systems-level mechanism may underlie its development, irrespective of the condition that causes it. In parallel with this growing recognition of the clinical importance of apathy, significant advances have been made in understanding normal motivated behaviour in humans and animals. These developments have occurred at several different conceptual levels, from work linking neural structures and neuromodulatory systems to specific aspects of motivated behaviour, to higher order computational models that aim to unite these findings within frameworks for normal goal-directed behaviour. In this review we develop a conceptual framework for understanding pathological apathy based on this current understanding of normal motivated behaviour. We first introduce prominent theories of motivated behaviour—which often involves sequences of actions towards a goal that needs to be maintained across time. Next, we outline the behavioural effects of disrupting these processes in animal models, highlighting the specific effects of these manipulations on different components of motivated behaviour. Finally, we relate these findings to clinical apathy, demonstrating the homologies between this basic neuroscience work and emerging behavioural and physiological evidence from patient studies of this syndrome.

  • apathy
  • motivation
  • goal-directed behaviour
  • reward
  • effort
  • decision making
  • cognitive neuroscience

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: http://creativecommons.org/licenses/by/4.0

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Footnotes

  • Contributors CLH, CBH, JS and MH all contributed significantly to the conceptual design, writing and revising of this manuscript.

  • Funding This study was funded by Wellcome Trust (grant no: 206330/Z/17/Z).

  • Competing interests None declared.

  • Patient consent Not required.

  • Provenance and peer review Commissioned; externally peer reviewed.

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