Consciousness is private - our conscious experiences are inherently subjective. To infer someone else's consciousness, we typically rely on overt behaviors like language and body gestures. But sometimes these overt expressions are unreliable or absent altogether
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Sleuthing subjectivity: a review of covert measures of consciousness - Nature Reviews Neuroscience
Consciousness may be inferred in others through observable behaviours such as facial expressions and vocalizations. However, such overt reporting has limitations, leading to research on physiological ...