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Date: July 21, 2023 10:49PM
http://www.scholarpedia.org/article/Tactile_hair_in_ManateesPerioral bristles are used to grasp objects, including plants that are ingested during feeding (Marshall et al., 1998). Because this grasping involves the face rather than the hand, it is referred to as ‘oripulation’. Often, tactile scanning by the oral disk is followed by vigorous, repetitive oripulation by the large perioral vibrissae on the upper lips. This occurs not only with plants during feeding, but also during investigation of novel objects including anchor lines, bathing suits, and human legs. Such a behavioral specialization may be indicative of extensive sensorimotor integration within the central nervous system representations for the face. Psychophysical tests of a few captive subjects have demonstrated that tactile acuity by manatees using the vibrissae of the face is at least as good as that of an elephant using the tip of its trunk (Weber fraction of 3-14%; Bachteler and Dehnhardt, 1999; Bauer et al., 2005). Interestingly, the eyes often close during feeding, which may heighten tactile acuity.