PS71CH11_Greene ARjats.cls November 27, 2019 15:55 Annual Review of Psychology Concepts and Compositionality: In Search of the Brain’s Language of Thought Steven M. Frankland1 and Joshua D. Greene2 1Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey 08544, USA; email:
[email protected] 2Department of Psychology and Center for Brain Science, Harvard University, Cambridge, Massachusetts 02138, USA; email:
[email protected] Annu. Rev. Psychol. 2020. 71:273–303 Keywords First published as a Review in Advance on compositionality, conceptual combination, language of thought, default September 24, 2019 mode network, grid cells, artificial intelligence The Annual Review of Psychology is online at psych.annualreviews.org Abstract https://doi.org/10.1146/annurev-psych-122216- Imagine Genghis Khan, Aretha Franklin, and the Cleveland Cavaliers per- 011829 forming an opera on Maui. This silly sentence makes a serious point: As Access provided by Harvard University on 01/08/20. For personal use only. Copyright © 2020 by Annual Reviews. humans, we can flexibly generate and comprehend an unbounded num- Annu. Rev. Psychol. 2020.71:273-303. Downloaded from www.annualreviews.org All rights reserved ber of complex ideas. Little is known, however, about how our brains ac- complish this. Here we assemble clues from disparate areas of cognitive neuroscience, integrating recent research on language, memory, episodic simulation, and computational models of high-level cognition. Our review is framed by Fodor’s classic language of thought hypothesis, according to which our minds employ an amodal, language-like system for combining and recombining simple concepts to form more complex thoughts. Here, we highlight emerging work on combinatorial processes in the brain and con- sider this work’s relation to the language of thought.