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Updated: Jan 29, 2026

A Rapid Food-Preference Assay in Drosophila
Published on: February 11, 2021
Goal-dependent flexibility in preferences formation from rapid payoff sequences
Michael Brusovansky1, Nira Liberman1, Marius Usher1
1School of Psychological Sciences and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.
Abstract:
The formation of attitudes or preferences for alternatives that consist of rapid numerical sequences has been suggested to reflect either a summation or an averaging principle. Previous studies indicate the presence of two mechanisms, accumulators (that mediate summation) and population-coding (that mediate averaging), which operate in preference formation tasks of rapid numerical sequences, and are subject to task-demands and individual differences. Here, we test whether participants can flexibly control the preference mechanism they deploy as a function of the reward contingency. Towards this aim, participants in two studies (N1 = 21, N2 = 23) made choices between the same sequence alternatives in two task-framing sessions, which made the reward dependent on the sequence-sum or sequence-average, respectively. The results demonstrate that although participants show an overall bias in favour of averaging, they are also remarkably flexible in deploying an averaging or a summation type mechanism that matches the reward contingency.
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