Abnormal nonverbal communicative behavior Abnormal communicative facial expressions 2022-08-18T12:34:20Z Abnormal facial expression use Abnormal expressions (movements or position of muscles of the face that convey the emotional state of an individual to observers during social interactions) comprising abnormalities of quantity, range, context-appropriateness, and quality. This term describes the way facial expressions are used for communicating to other people (social communication). This term does not comprise abnormal facial expressions related to motoric neurological deficits such as hypomimic facies observed in individuals with Parkinson syndrome.