EntityQ7260673· pop 5· linked from 223 articlespupillary responseSign in to savephysiological response that varies the size of the pupilConnectionsnonverbal communicationEntityCharles DarwinEntitylinguisticsEntitycommunicationEntityphysiologyEntitylaughterEntityautismEntityspeechEntitycocaineEntitysign languageEntitydigital object identifierEntityInternational Standard Serial NumberEntitysemioticsEntityophthalmologyEntityrhythmEntitypupilEntityepinephrineEntitylysergic acid diethylamideEntityAsperger syndromeEntityillusionEntityCategoriesPupilSexual arousal