365 Psychophysiologic analysis of forced hypoxic stabillity production by means of interval hypoxic traning

Abstracts

/International

Journal

contrary, extraverts reached the effectiveness of their work by the way of attracting of a mechanism of arbitrary attention through the activation of non-specific thalamo-cortical system. Data suggest higher “biological cost” of monotonous operator’s work on VDT for extraverts with low cortical activation.

365 PSYCHOPHYSIOLOGIC ANALYSIS OF FORCED HYPOXIC STABILLITY PRODUCTION BY MEANS OF INTERVAL HYPOXIC TRANING Y.G. Platonov*, V.P. Leutin, S.G. Krivoschekov, A.I. Michalchenko Institute of Physiology, Russian Academy of Medical Sciences, Siberian Division, Timakova street 4, Novosibirsk, 630117 Russia The presence of hypoxic hypoxia, cold hypoxia, “latent exercise hypoxia”, brain circulatory hypoxia conditioned by rapid local brain circulation decrease and insufficient oxygen transport to function brain cells under neurosis denote that hypoxic brain status reasonably appears under disadaptation of various genesis. Correction of these states is possible by oxidation metabolic mechanisms activation with the help of interval hypoxic training (IHT) - i.e. gas mixture inhalation with reduced oxygen content under normal barometric pressure using impulse regimen. Tentative investigations concerning high altitude hypoxic influence (2500 and 3500 m above the see level) on healthy subjects and psychophysiologic analysis of antihypoxic mechanisms activation by BIT under sea level were conducted. Measuring of EEG parameters and verbal testing of short-term memory were carried out. The improvement of emotional memory parameters during IHT was revealed. This improvement was multiple in contradiction to short-term (during one day) emotional memory activation under high altitude. Parameters of EEG rhythms capacity spectrum (FIT) and EEG signals coherency revealed intensification of functional links and differentiated right brain hemispere activation under IHT. Normalizing effects of II-IT on breath center regulatin and vascular response reactivity in contrast to activating influense of high altitute were obtained. Undoubtable value of IHT aimed at correction of functional disordes connected with hypoxic states is its simplicity of application, wide range of influence efficiency, absence of both hypoxic impairment and negative emotional background and consequently, the opportunity of wide application of this method in medicine and prophylaxis.

366 HABITUATION OF P300 AND INTROVERTED EXTRAVERTED PERSONALITY TYPES

VS.

M. Lindin*, M. Zurron and F. Diaz Department of Psicoloxia Clinica e Psicobioloxia, Facultade de Psicoloxia, Campus Universitario S/N, Santiago de Com-

of Psychophysiology

30 (1998)

95-271

141

postela, A Con&a, 15.705 Spain The object of this study was to characterise the possible differences in P300 intrablock habituation between two groups of subjects selected from an initial sample (N = 251, based on their extreme scores on the EPQ-A scale: a) introverted (n = 5, EPQ-A M: 7.4~S.D.: 2.07) and bjextraverted (n = 10, EPQ-A: M: 18.10-SD.: 1.20). An active oddball task was used where each subject was presented with two blocks (each divided into 5 sub-blocks) of 500 tones each (target: 1200 Hz, 20%, standard: 1000 Hz, 80%; duration: 50 ms., intensity: 85 dB SPL), with an IS] of 900 ms and an IBI of 3 minutes. A mixed model repeated measures ANOVA was applied with a within-subject factor (Sub-block) and a between-subject factor (EPQ), a repeated measures ANOVA with a single within-sub ject factor (Sub-block) to analyse each group individually, and the t-test for comparisons between pairs of sub-blocks. A significant effect of the Sub-block factor was obtained for the first block (p < 0.002). The introverted group displayed a tendency to increase P300 amplitude throughout the subblocks while the extraverted group displayed a significant sub-block effect (p < 0.001) with an increase in P300 amplitude between sub-blocks 1 and 2 (p < 0.027) and a decrease between sub-blocks 2 and 5 (p < 0.010). The IBI did not cause changes in P300 amplitude in the introverted group, but did bring about an important, but not significant recovery in that of the extraverted group. In block 2 no significant effect was obtained for the sub-block factor, probably due to the fact that the introverted group did not display any changes in P300 amplitude. However, a significant subblock effect was obtained in the extraverted group (p < 0.043) with a significant reduction in P300 amplitude betweep sub-blocks 2 and 5 (p < 0.0251. Conclusions: a> In the introverted group, P300 amplitude increased throughout the first block of stimuli, then remaining stable both in spite of IBI as well as throughout the second block of stimuli. b) In the extraverted group, for the first block of stimuli, P300 amplitude increased significantly (orientation) between the first and second sub-block, followed by a significant decrease (habituation) from the second until the fifth sub-block; a recovery due to IBI, followed by an equally significant decrease (rehabituation) throughout the second block of stimuli.

367 DISSOCIATED RETRIEVAL OF LONG-TERM MEMORY TRACES: THE DEPENDENCE ON FORMS OF MEMORY V.I. Arkhipov Institute of Theoretical and Experimental Pushchino, Moscow Region, 142292, Russia

Biophysics,

Pharmacologically induced state-dependent retrieval of longterm memory traces is the experimental model of multiple personality and another forms of memory dissociation. Under