A novel cost-benefit decision-making task involving cued punishment; effects of sex and psychostimulant administration

Abstract

Chronic substance use is associated with alterations in multiple forms of cost-benefit decision making, which may prolong and exacerbate continued use. Cues that predict reward can cause substantial shifts in a variety of reward-directed behavior, including decision making. In contrast, how decision making is modulated by cues predictive of punishment is much less well understood. To begin to address these issues, male and female Long-Evans rats were tested in a novel decision-making task in which they chose between a small, "safe" reward and a large reward that was punished by a mild footshock when it was preceded by a probabilistically delivered cue prior to the choice. Rats of both sexes were sensitive to the cue, preferring the large reward in the absence of the cue but the small reward in the presence of the cue. Acute systemic amphetamine reduced choice of the large reward and diminished the efficacy of the cue in guiding choice behavior. Chronic cocaine led to divergent patterns of cue insensitivity in males and females; males increased choice of the large reward on cued trials, whereas females increased avoidance of the large reward on uncued trials. Similar to acute amphetamine, acute systemic administration of the D2/3 dopamine receptor agonist bromocriptine reduced preference for the large reward across all groups. These findings highlight the contributions of punishment cues to decision making, as well as the importance of sex as a biological variable in investigating cognitive alterations caused by chronic substance use.