Skip to Main content Skip to Navigation
Journal articles

Disconnecting force from money: effects of basal ganglia damage on incentive motivation.

Abstract : Bilateral basal ganglia lesions have been reported to induce a particular form of apathy, termed auto-activation deficit (AAD), principally defined as a loss of self-driven behaviour that is reversible with external stimulation. We hypothesized that AAD reflects a dysfunction of incentive motivation, a process that translates an expected reward (or goal) into behavioural activation. To investigate this hypothesis, we designed a behavioural paradigm contrasting an instructed (externally driven) task, in which subjects have to produce different levels of force by squeezing a hand grip, to an incentive (self-driven) task, in which subjects can win, depending on their hand grip force, different amounts of money. Skin conductance was simultaneously measured to index affective evaluation of monetary incentives. Thirteen AAD patients with bilateral striato-pallidal lesions were compared to thirteen unmedicated patients with Parkinson's; disease (PD), which is characterized by striatal dopamine depletion and regularly associated with apathy. AAD patients did not differ from PD patients in terms of grip force response to external instructions or skin conductance response to monetary incentives. However, unlike PD patients, they failed to distinguish between monetary incentives in their grip force. We conclude that bilateral striato-pallidal damage specifically disconnects motor output from affective evaluation of potential rewards.
Document type :
Journal articles
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-00333398
Contributor : Anny Wartel <>
Submitted on : Thursday, October 23, 2008 - 10:48:57 AM
Last modification on : Tuesday, September 22, 2020 - 3:58:26 AM

Links full text

Identifiers

Citation

Liane Schmidt, Baudouin Forgeot d'Arc, Gilles Lafargue, Damien Galanaud, Virginie Czernecki, et al.. Disconnecting force from money: effects of basal ganglia damage on incentive motivation.. Brain - A Journal of Neurology , Oxford University Press (OUP), 2008, 131 (Pt 5), pp.1303-10. ⟨10.1093/brain/awn045⟩. ⟨hal-00333398⟩

Share

Metrics

Record views

781