A critical component of decision-making involves assessing the value between different options. Altered decision-making processes are a characteristic of many neurological disorders, including drug addiction and pathological gambling. Therefore, it is imperative to identify the neural systems mediating changes in how one assesses the value between different rewards. This proposal tests the hypothesis that the mesolimbic dopamine system is required for changing the value and relative preference between quantifiably identical food rewards that differ only in flavor. To address this question it is necessary to 1) manipulate the subjective preference between distinct rewards, 2) record dopamine release while the subjective preference changes, and 3) control the activity the dopamine system. This project employs a novel training paradigm in which the initial subjective preference between different flavors of food can either be modulated or maintained. The experiments in Aim 1 will utilize fast-scan cyclic voltammetry in rats to identify changes in reward-evoked dopamine release as the subjective preference evolves across training. The experiments in Aim 2 involve optogenetic manipulations of dopamine neurons at the time of reward delivery to establish the necessity and sufficiency of dopamine in controlling subjective preference. Together, the findings from these proposed experiments will elucidate the role of mesolimbic dopamine in changing the subjective valuation of rewards.

Public Health Relevance

Altered value-based decision-making processes are a characteristic of many neurological disorders, including drug addiction and pathological gambling. Therefore, it is imperative to elucidate the neural systems responsible for changing the estimated value of a reward. The goal of these experiments is to ascertain the role of dopamine in updating the preference between distinct rewards.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21DA042362-02
Application #
9552136
Study Section
Neurobiology of Motivated Behavior Study Section (NMB)
Program Officer
Sorensen, Roger
Project Start
2017-09-01
Project End
2019-08-31
Budget Start
2018-09-01
Budget End
2019-08-31
Support Year
2
Fiscal Year
2018
Total Cost
Indirect Cost
Name
University of Texas Health Science Center San Antonio
Department
Biology
Type
Schools of Arts and Sciences
DUNS #
800189185
City
San Antonio
State
TX
Country
United States
Zip Code
78249
Xiao, Lei; Chattree, Gaurav; Oscos, Francisco Garcia et al. (2018) A Basal Ganglia Circuit Sufficient to Guide Birdsong Learning. Neuron 98:208-221.e5