- American Association on Intellectual and Developmental Disabilities (1)
- American Association on Mental Retardation (1)
- British Psychophysiology Society (1)
- Cognitive Neuroscience Institute (Norwich, Vt.) (1)
- Council for Exceptional Children (1)
- German Psychophysiology Society (1)
- Society for Psychophysiological Research (U.S.) (1)
- Verband Deutscher Hilfsschulen (1)
- Verband Deutscher Sonderschulen (1)
- no value (6)