has part characteristic of has modifier abnormal behavior abnormal touch response touch sensitivity defective This phenotype is commonly assayed by scoring larval avoidance responses following stroking of the thoracic segments (see Kernan et al., 1994). On its own, this is not sufficient evidence for an abnormality in sensory perception of touch, as motor defects can also cause this phenotype. touch response defective Phenotype that is any abnormality in or loss of a stereotypical behavioral response to touch. phenotypic_class FBcv:0000421 touch related behavior abnormal process quality