A neuroscientific perspective on cognitive biases J.E. (Hans) Korteling, A.-M. Brouwer, A. Toet* TNO, Soesterberg, The Netherlands * Corresponding author: Alexander Toet TNO Kampweg 5 3769DE Soesterberg, The Netherlands Email:
[email protected] Abstract Human reasoning shows systematic and persistent simplifications (‘heuristics’) and deviations from ‘rational thinking’ that may lead to suboptimal decisional outcomes (‘cognitive biases’). There are currently three prevailing theoretical perspectives on the origin of heuristics and cognitive biases: a cognitive-psychological, an ecological and an evolutionary perspective. However, none of these viewpoints provides an overall explanatory framework for the underlying mechanisms of cognitive biases. Here we propose a neuroscientific framework for cognitive biases, arguing that many cognitive biases arise from intrinsic brain mechanisms that are fundamental to biological neural networks and that originally developed to perform basic physical, perceptual, and motor functions. Keywords cognitive biases, heuristics, decision making, neural networks, neural information processing, human irrationality 1 Introduction In daily life, we constantly make judgments and decisions (either conscious or unconscious) without knowing their outcome. We typically violate rules of logic and probability and resort to simple and near-optimal heuristic decision rules (‘mental shortcuts’) to optimize the likelihood of an acceptable outcome, which may be effective in conditions with time-constraints, information overload, or when no optimal solution is evident (Gerd Gigerenzer & Gaissmaier, 2010). We are also inclined to use heuristics when problems appear familiar and when we do not feel the need to gather additional information. Although heuristics can result in quite acceptable outcomes in everyday situations, and when the time cost of reasoning are taken into account, people often violate tenets of rationality in inadvisable ways (Shafir & LeBoeuf, 2002).