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Analysis of acoustically evoked responses by digital filtering
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recorded from the frontal area on the mid-line (Fz) and lo-20 electrode positions on bilateral Theta rhythm of 6-7 c/set parasagittal lines. lasting longer than 1 set with the larpest amplitude at Fz was judoed as FmP. Flean >ncidenc& of Fm0 per 10 min in the 15 subjects was 4.2 durina staae REM. 1.3 durina 1, O.l-during stage 2, ani 2.7
carried out during 8 hours of night sleep. Hean maximal decrease in Pa02 (+ SD) during sleep was 13.324.5 mm tlg for COPD patients, and 11.6AO.8 mm Hg for normal subjects; comparable increases for PaC02 were 6.8A2.2 mm Hp and 5.1+1.7 mm Hg. In the different stages of sleep, the mean Pa02 values decreased from 58.2 mm Hg in non REfi sleep to 49.4mm Ha durinq REH sleep in COPD paThe mean PaCO2 values increased from' tients. 47.0 mm Ha to 48.6mm Ha.The maximum decrease of Pa02 and ihe maximum iicrease of PaC02 during sleep in COPD patients were observed in REP1 sleep, but there were no such tendencies in Nocturnal worseninq of hypoxnormal subjects. emia in COPD patients could be explajned by These findings should alveolar hypoventilation. be considered for treatment of severe COPD patients. A-7.02 SPONSES Mashima
ANALYSIS OF ACOUSTICALLY EVOKED REBY DIGITAL FILTERIr!G. Y. Ehara, H. and G. Ichikawa (Tokyo, Japan)
Analysis of acoustically evoked slow vertex responses (S.V.R.) was carried out using a computerized digital filter, in both awake and The non-recursive digital sleeping states. bandpass filter using the fast Fourier transform was desiqned by a PDP 11/60 computer. The detectability‘of the responses was examined under digital filtering and non-filtered condiThe results are as follows: 1) the sigtion. nal-to-noise ratio of filtered S.V.R. significantly increased compared with non-filtered S. V.R.: 2) the most effective oassband to detect S.V.i. was 3 to 9Hz, and the'evoked response thus obtained clearly showed damped oscillation; 31 the orobabilitv of false-oositive resoonses ’ ~8s redhced by this digital kilter. The application of this diqital filter is thought to be effective to obta;n reliable S.V.R.. B-12.01 DOUBLE COINCIDEb!CE BETWEEN THE STUTTERIF!G RECOVERY OF THALAFlIC SPONTANEOUS DISCHARGE AHD THE SEQUENCE OF COLLISIONS AND BOUNCINGS OF S. Watanabe, Y. Uchino, N. AN ELASTIC BODY. Hirai, S. Suzuki and S. Homma (Mitaka, Japan) Decreasing intervals of thalamic spontaneous discharge during recovery from tonic inhibition (stuttering recovery) were shown to be approximated by a set of exponential decreases of the bouncing-intervals of an elastic body. Approximate values of "restitution coefficient", e, (0 < e < l), were calculated for each set of stuttering recovery intervals by computer processing of the thalamic discharge. It was also noticed that the duration of intercalated high frequency burst discharges which appeared during stuttering recovery was rather stable, being quite irrelevant to the decrementing inter-burst intervals. This stationary characteristic was further analysed and
recorded from the frontal area on the mid-line (Fz) and lo-20 electrode positions on bilateral Theta rhythm of 6-7 c/set parasagittal lines. lasting longer than 1 set with the larpest amplitude at Fz was judoed as FmP. Flean >ncidenc& of Fm0 per 10 min in the 15 subjects was 4.2 durina staae REM. 1.3 durina 1, O.l-during stage 2, ani 2.7
carried out during 8 hours of night sleep. Hean maximal decrease in Pa02 (+ SD) during sleep was 13.324.5 mm tlg for COPD patients, and 11.6AO.8 mm Hg for normal subjects; comparable increases for PaC02 were 6.8A2.2 mm Hp and 5.1+1.7 mm Hg. In the different stages of sleep, the mean Pa02 values decreased from 58.2 mm Hg in non REfi sleep to 49.4mm Ha durinq REH sleep in COPD paThe mean PaCO2 values increased from' tients. 47.0 mm Ha to 48.6mm Ha.The maximum decrease of Pa02 and ihe maximum iicrease of PaC02 during sleep in COPD patients were observed in REP1 sleep, but there were no such tendencies in Nocturnal worseninq of hypoxnormal subjects. emia in COPD patients could be explajned by These findings should alveolar hypoventilation. be considered for treatment of severe COPD patients. A-7.02 SPONSES Mashima
ANALYSIS OF ACOUSTICALLY EVOKED REBY DIGITAL FILTERIr!G. Y. Ehara, H. and G. Ichikawa (Tokyo, Japan)
Analysis of acoustically evoked slow vertex responses (S.V.R.) was carried out using a computerized digital filter, in both awake and The non-recursive digital sleeping states. bandpass filter using the fast Fourier transform was desiqned by a PDP 11/60 computer. The detectability‘of the responses was examined under digital filtering and non-filtered condiThe results are as follows: 1) the sigtion. nal-to-noise ratio of filtered S.V.R. significantly increased compared with non-filtered S. V.R.: 2) the most effective oassband to detect S.V.i. was 3 to 9Hz, and the'evoked response thus obtained clearly showed damped oscillation; 31 the orobabilitv of false-oositive resoonses ’ ~8s redhced by this digital kilter. The application of this diqital filter is thought to be effective to obta;n reliable S.V.R.. B-12.01 DOUBLE COINCIDEb!CE BETWEEN THE STUTTERIF!G RECOVERY OF THALAFlIC SPONTANEOUS DISCHARGE AHD THE SEQUENCE OF COLLISIONS AND BOUNCINGS OF S. Watanabe, Y. Uchino, N. AN ELASTIC BODY. Hirai, S. Suzuki and S. Homma (Mitaka, Japan) Decreasing intervals of thalamic spontaneous discharge during recovery from tonic inhibition (stuttering recovery) were shown to be approximated by a set of exponential decreases of the bouncing-intervals of an elastic body. Approximate values of "restitution coefficient", e, (0 < e < l), were calculated for each set of stuttering recovery intervals by computer processing of the thalamic discharge. It was also noticed that the duration of intercalated high frequency burst discharges which appeared during stuttering recovery was rather stable, being quite irrelevant to the decrementing inter-burst intervals. This stationary characteristic was further analysed and