Dissecting drug effects in preclinical models of impulsive choice: emphasis on glutamatergic compounds
Abstract
Rationale
Impulsive choice is often measured with delay discounting paradigms. Because there are multiple discounting procedures, as well as different statistical analyses that can be applied to data generated from these paradigms, there are some inconsistencies in the literature regarding drug effects on impulsive choice.
Objectives
The goal of the current paper is to review the methodological and analytic approaches used to measure discounting and to discuss how these differences can account for differential drug effects observed across studies.
Results
Because some procedures/analyses use a single data point as the dependent variable, changes in this value following pharmacological treatment may be interpreted as alterations in sensitivity to delayed reinforcement, but when other procedures/analyses are used, no changes in behavior are observed. Even when multiple data points are included, some studies show that the statistical analysis (e.g., ANOVA on raw proportion of responses vs. using hyperbolic/exponential functions) can lead to different interpretations. Finally, procedural differences (e.g., delay presentation order, signaling the delay to reinforcement, etc.) in the same discounting paradigm can alter how drugs affect sensitivity to delayed reinforcement.
Conclusions
Future studies should utilize paradigms that allow one to observe alterations in responding at each delay (e.g., concurrent-chains schedules). Concerning statistical analyses, using parameter estimates derived from nonlinear functions or incorporating the generalized matching law can allow one to determine if drugs affect sensitivity to delayed reinforcement or impair discrimination of the large and small magnitude reinforcers. Using these approaches can help further our understanding of the neurochemical underpinnings of delay discounting.
Keywords
Delay discounting Impulsive choice Sensitivity to delayed reinforcement Quantitative analysesNotes
Acknowledgements
The author would like to thank Dr. Joshua Beckmann for providing valuable insights on some of the issues discussed in this paper, as well as for introducing him to nonlinear mixed effects modeling. The author would also like to thank Dr. Mark Bardgett for providing feedback on a draft of the manuscript.
Funding information
The current study was supported by NIGMS grant 8P20GM103436-14.
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