Abnormal responses to sensory stimuli are not mentioned in any diagnostic scheme, although they have been associated with AS.[4] Because DSM-IV and ICD-10 exclude speech and language difficulties, these definitions exclude some of the original cases described by Hans Asperger. According to one researcher, the majority of individuals with AS do have speech and language abnormalities, and the recent DSM–IV says that "the occurrence of 'no clinically significant delays in language does not imply that individuals with Asperger Disorder have no problems with communication' (American Psychiatric Association, 2000, p. 80)".[3] The Gillberg and Gillberg criteria are considered closest to Asperger's original description of the syndrome;[3] the aggression and abnormal prosody that other authors say defined Asperger's patients are not mentioned in any criteria.[5][9][19]