Finding 1️⃣: fMRI data from neurotypical participants 🧠as they performed inductive and deductive reasoning tasks suggests that the human language system is not engaged during abstract logical reasoning 🔍 5/8
We used a 2-pronged approach: fMRI in healthy adults and behavioral investigation in patients w/ severe aphasia (with Rosemary Varley and @ParisJaggers@BennYael). In both approaches, we examined both inductive & deductive reasoning (thought to occur via the symbolic LOT). 4/8
Fedorenko et al. (2011) identified a fronto-temporal language network in the brain, responsible for human language processing, allowing us to probe whether the human language system is responsible for abstract symbolic reasoning. 3/8
Fodor (1975) hypothesized that human reasoning occurs via a symbolic Language of Thought (LOT) allowing us to reason abstractly, compositionally, and systematically. Some theorists (e.g. Chomsky, 1965) further speculated that this LOT was our natural language. 2/8
3️⃣ In a supplementary analysis, we also showed that inductive reasoning and matrix reasoning recruit the Multiple Demand (MD) system (Duncan, 2010), but deductive reasoning engages distinct brain areas (stay tuned for more on this!) 8/8
Thus, linguistic representations do not undergird abstract logical reasoning, 🚫 adding to the body of evidence that we don’t use language to think. 🧩 7/8
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