Psychophysiological research of auditory responses in the severely and profoundly mentally retarded : Maltidimensional assessment by auditory brainstem response, slow vertex response, and variables of autonomic functions

Research Project

Project/Area Number	60510053
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Psychology
Research Institution	Kanazawa University
Principal Investigator	KATAGIRI Kazuo Faculty of Education, Kanazawa University, 教育学部, 助教授 (00004119)
Co-Investigator(Kenkyū-buntansha)	石川克巳国立療養所医王病院, 小児科, 医長 ISHIKAWA Katsumi Department of Pediatrics, National Io Hospital
Project Period (FY)	1985 – 1986
Project Status	Completed (Fiscal Year 1986)
Budget Amount *help	¥1,600,000 (Direct Cost: ¥1,600,000) Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000) Fiscal Year 1985: ¥900,000 (Direct Cost: ¥900,000)
Keywords	Severly and Profoundly Mentally Retarded Persons / Auditory Brainstem Response / Phasic HR Response / tonic HR反応
Research Abstract	Severly and profoundly mentally retarded persons (SMRs) show a weak responsiveness to enviromental stimuli. In this project, three auditory evoked potentials ( auditory brainstem response, middle latency response, and slow vertex response ) and some variables of psychophysiological functions ( heart rate,respiration rate, eye movement,and so on ) were studied in SMRs. The main results were as follows: 1. Many SMRs had the higher auditory threshold (above 30dB nHL), as determineded by the threshold of ABR (wave V). 2. Peak latencies of evoked potentials and ABR I-V interpeak latencies were prolonged in many SMRs. 3. The phasic descending HR responses to stimuli in living situation increased with development. 4. In the SMRs who didn't show phasic HR responses, tonic HR responses(extention of HR change) to enviroment were observed. 5. The HR activity to enviroment couldn't be observed in persons who had sever brainstem dysfunction.