A multi-lab study, known as the Many Smiles Collaboration, has investigated the facial feedback hypothesis. The study's findings are somewhat inconsistent, with some reports suggesting that restricting facial mimicry does not impact emotion recognition, while others imply a link between facial expressions and emotional state. The research appears to have explored various aspects of facial feedback, including its effects on mood, emotion recognition, and sense of body ownership, but the results may not be entirely conclusive.