engleski

Effects of declarative and procedural learning on sleep stages and EEG power spectral analysis

Aim: Previous data suggested that a cognitive function of sleep is to consolidate newly acquired memories for long- term usage. Other studies show there is no indication that sleep serves a unique role in the consolidation of declarative memory and procedural skills. In the present study we investigate effects of declarative and procedural learning on polysomnography recordings (PSG) in a repeated measures design. Methods: A total of 84 all- night PSG records, acquired with Alice4 PSG system (Respironics, USA), were gathered from 21 healthy male subjects in four consecutive nights in the Sleep Laboratory at the University of Split School of Medicine. Results: Total sleep time and time spent in each sleep stage did not differ among control nights, nights after declarative, and nights after procedural learning. There were no significant differences in the SSS score before (P50.83), and after sleep (P50.62) among three experimental nights. The subjects exhibited significantly greater knowledge compared with 21 control students who did not learn prior to sleep (Po0.01). Spectral analysis and power density spectra revealed no differences among experimental nights except in the theta frequencies band on central position of electrodes. Conclusion: The results did not show significant difference in sleep architecture and EEG power distribution in NREM and REM sleep among polysomnographic records of control night, night after declarative, and night after procedural learning.

declarative and procedural learning ; sleep stages ; EEG power spectral analysis

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