Martín Rajo, MontserratValiña García, María Dolores2023-03-082023-03-082023Martín, M. & Valiña, M.D. (2023). Heuristics, Biases and the Psychology of Reasoning: State of the Art. Psychology, 14, 264-294. https://doi.org/10.4236/psych.2023.1420162152-7180http://hdl.handle.net/10347/30277Part of this work was presented at 22nd Conference of the European Society for Cognitive Psychology-ESCOP, held in Lille, France, August, 2022.Investigations on heuristics and biases have had a great impact on the study of reasoning and related higher cognitive processes, such as judgment and decision making. Specifically, the research in cognitive psychology of reasoning has revealed that people frequently activate mental shortcuts, or heuristics, to make inferences. These are non-logical strategies and could lead subjects to commit systematic deviations from the tenets of normative principles, that is, cognitive biases. The key objective of this paper is to present some of the most relevant theories on heuristics and biases in reasoning, focusing on the dual process theories of deduction. According to these theories, there are two kinds of thinking. Type 1, automatic, unconscious, implicit, fast and effortless and Type 2, reflective, controlled, conscious, explicit, slow and effortful. Much debate on these theories has emphasized on the relationship between both types of processes and the underlying factors that could triggered one or other. In this regard, different dual-process theories propose distinct answers to these questions. The results in the literature have registered that the likelihood of activation of Type 1 and Type 2 processes has important consequences on reasoning, both in experimental laboratory tasks and in everyday situations. Recent empirical investigations that have studied the critical role that intuitive and deliberative processes play in different professional areas are displayed. It is a key question that future research continues with the study of the underlying procedures that professionals activate for reasoning and decision makingengCopyright © 2023 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by-nc-sa/4.0/ReasoningHeuristicsCognitive BiasesIntuitive ThinkingAnalytic Thinkingjournal article10.4236/psych.2023.1420162152-7199open access