Apathy symptoms modulate motivational decision making on the Iowa gambling task

Progress, Njomboro; Shoumitro, Deb; Humphreys Glyn W · 2012 · DOAJ

DOI: 10.1186/1744-9081-8-63

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Summary

This study investigates whether the Iowa Gambling Task (IGT) can effectively detect motivational decision-making deficits associated with apathy in patients with acquired brain damage. Apathy is characterized by reduced motivation, goal-directed thoughts, and emotions, yet standard neurocognitive tests often fail to reliably identify these deficits. The authors hypothesized that the IGT, which analogues real-world socio-executive processes, would be more sensitive to apathy symptoms than standard executive function measures. The study included 51 participants: 22 healthy controls and 29 brain-damaged patients recruited from clinics in the West Midlands, England. Patients had varied etiologies, including cerebrovascular accidents, head injuries, anoxia, and encephalitis. Apathy was assessed using the informant version of the Apathy Evaluation Scale (AES-I), with a score of 41 or higher indicating the presence of apathy. This resulted in 18 patients with apathy and 10 without. To control for confounding variables, depressive symptoms were measured using the Beck Depression Inventory, and executive function was assessed using the Brixton Spatial Anticipation test. Participants completed the non-automated card version of the IGT, choosing from four decks (two risky, two safe) over 60 rounds. Results indicated that patients with apathy were distinctively impaired on the IGT compared to both non-apathetic brain-damaged patients and healthy controls. While healthy controls and non-apathetic patients shifted toward selecting cards from safe decks as the task progressed, apathetic patients continued to select significantly more cards from risky decks, particularly in later blocks. Statistical analysis revealed a significant interaction between task block and participant type, with apathetic patients making significantly more risky choices than both other groups. Crucially, this impairment persisted even when controlling for depressive symptoms and executive function deficits measured by the Brixton test, which did not significantly differentiate the patient groups. Furthermore, a positive correlation was found between the severity of apathy symptoms and the number of risky cards selected. The findings demonstrate that the IGT is a sensitive tool for detecting socio-executive deficits related to apathy, whereas standard executive function tests are not. The authors suggest that apathy involves specific deficits in the capacity to structure self-initiated, goal-directed behavior rather than general cognitive impairment. This has implications for clinical practice, suggesting that rehabilitation programs should focus on providing external structure and cues for daily activities. The study supports the view that apathy reflects a dysfunction in motivational decision-making processes, potentially linked to impaired emotional biasing or future time perspective, highlighting the IGT’s utility in assessing real-world functional deficits in neuropsychiatric disorders.

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• cognitive impairment