The face of fluency: Semantic coherence automatically elicits a specific pattern of facial muscle reactions

This study shows that high conceptual fluency induced by hidden semantic coherence automatically triggers a specific pattern of facial expressions. In the present study, word triads that either had or had not a common remote associate were read by individuals while automatic facial responses were recorded. Although participants were ignorant about the underlying semantic structure, participants’ faces showed an activation of the smiling muscle zygomaticus major (indicating increased positive affect), a relaxation of the frowning muscle corrugator supercilii (indicating decreased negative affect and mental effort), and a relaxation of the forehead muscle frontalis (indicating increased familiarity) after reading coherent compared to incoherent word triads. Implications for intuitive judgements of semantic coherence are discussed.