Citation

Peer E, Gamliel E. Acta Psychol. 2012; 141(3): 352-359.

Affiliation

Heinz College, Carnegie Mellon University. Electronic address: epeer@andrew.cmu.edu.

Copyright

(Copyright © 2012, Elsevier Publishing)

DOI

10.1016/j.actpsy.2012.09.005

PMID

23089043

Abstract

People generally overestimate the time they can save when increasing from a relatively high driving speed. Previous research suggested that people follow a Proportion Heuristic, calculating the time saved as the proportion of speed increase from the new higher speed. The present study suggests that drivers use another heuristic - the Percentage Heuristic - to calculate how much time they save by increasing speed. In the percentage heuristic, the initial (rather than higher) speed is used as the denominator. Using a discriminating set of questions, we classified participants' responses as normative (correct answer), as following the proportion or percentage heuristic, or some other strategy. We found that participants used the percentage heuristic more often, perhaps because it predicts linearly increasing values of time saved when increasing speed. In addition, we found that participants high in need for cognition (NFC) gave correct answers more often than low NFC participants who relied more on heuristics.

Language: en