Mere Exposure: Preference Change for Novel Drinks Reflected in Human Ventral Tegmental Area

Area of Science:

• Neuroscience
• Psychology
• Decision Science

Background:

• Preference for novel stimuli develops gradually over repeated exposures.
• Psychological theories link this to alterations in the brain's valuation system.

Purpose of the Study:

• To investigate the neural mechanisms underlying the development of preference for novel stimuli.
• To examine the role of the dopamine system, specifically the ventral tegmental area (VTA), in preference formation.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
• Participants consumed a novel fluid daily for 10 days, with fMRI scans on day 1 and day 10.
• Analysis focused on changes in brain activation and functional connectivity related to preference shifts.

Main Results:

• Increased activation in the ventral tegmental area (VTA) correlated with changes in preference.
• Differential connectivity between the VTA and a network including the sensory thalamus, posterior insula, and ventrolateral striatum was linked to individual preference changes.

Conclusions:

• The VTA is crucial for assigning value to sensory stimuli and guiding preference development.
• These findings advance our understanding of dopaminergic function and its implications for behavioral addiction models.