ERIC Number: EJ1056548
Record Type: Journal
Publication Date: 2014-Mar
Abstractor: As Provided
Base Rates: Both Neglected and Intuitive
Pennycook, Gordon; Trippas, Dries; Handley, Simon J.; Thompson, Valerie A.
Journal of Experimental Psychology: Learning, Memory, and Cognition, v40 n2 p544-554 Mar 2014
Base-rate neglect refers to the tendency for people to underweight base-rate probabilities in favor of diagnostic information. It is commonly held that base-rate neglect occurs because effortful (Type 2) reasoning is required to process base-rate information, whereas diagnostic information is accessible to fast, intuitive (Type 1) processing (e.g., Kahneman & Frederick, 2002). To test this account, we instructed participants to respond to base-rate problems on the basis of "beliefs" or "statistics," both in free time (Experiments 1 and 3) and under a time limit (Experiment 2). Participants were given problems with salient stereotypes (e.g., "Jake lives in a beautiful home in a posh suburb") that either conflicted or coincided with base-rate probabilities (e.g., "Jake was randomly selected from a sample of 5 doctors and 995 nurses for conflict; 995 doctors and 5 nurses for nonconflict"). If utilizing base-rates requires Type 2 processing, they should not interfere with the processing of the presumably faster belief-based judgments, whereas belief-based judgments should always interfere with statistics judgments. However, base-rates interfered with belief judgments to the same extent as the stereotypes interfered with statistical judgments, as indexed by increased response time and decreased confidence for conflict problems relative to nonconflict. These data suggest that base-rates, while typically underweighted or neglected, do not require Type 2 processing and may, in fact, be accessible to Type 1 processing.
Descriptors: Probability, Intuition, Cognitive Processes, Physicians, Nurses, Conflict, Beliefs, Statistics, Stereotypes, Interference (Learning), Reaction Time, Problem Solving, Scoring, Inferences, Task Analysis, Undergraduate Students, Foreign Countries
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Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A
Identifiers - Location: Canada; United Kingdom (England)