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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Free Recall of Word Lists under Total Sleep Deprivation and after Recovery Sleep

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Valverde Zanini, Gislaine de Almeida [1] ; Tufik, Sergio [1] ; Andersen, Monica Levy [1] ; Martins da Silva, Raquel Cristina [1] ; Amodeo Bueno, Orlando Francisco [1] ; Rodrigues, Camila Cruz [1] ; Pompeia, Sabine [1]
Total Authors: 7
[1] Univ Fed Sao Paulo, UNIFESP, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Sleep; v. 35, n. 2, p. 223-230, FEB 1 2012.
Web of Science Citations: 2

Study Objectives: One task that has been used to assess memory effects of prior total sleep deprivation (TSD) is the immediate free recall of word lists; however, results have been mixed. A possible explanation for this is task impurity, since recall of words from different serial positions reflects use of distinct types of memory (last words: short-term memory; first and intermediate words: episodic memory). Here we studied the effects of 2 nights of TSD on immediate free recall of semantically unrelated word lists considering the serial position curve. Design: Random allocation to a 2-night TSD protocol followed by one night of recovery sleep or to a control group. Setting: Study conducted under continuous behavioral monitoring. Participants: 24 young, healthy male volunteers. Intervention: 2 nights of total sleep deprivation (TSD) and one night of recovery sleep. Measurements and Results: Participants were shown five 15 unrelated word-lists at baseline, after one and 2 nights of TSD, and after one night of recovery sleep. We also investigated the development of recall strategies (learning) and susceptibility to interference from previous lists. No free recall impairment occurred during TSD, irrespective of serial position. Interference was unchanged. Both groups developed recall strategies, but task learning occurred earlier in controls and was evident in the TSD group only after sleep recovery. Conclusion: Prior TSD spared episodic memory, short-term phonological memory, and interference, allowed the development of recall strategies, but may have decreased the advantage of using these strategies, which returned to normal after recovery sleep. (AU)

FAPESP's process: 98/14303-3 - Center for Sleep Studies
Grantee:Sergio Tufik
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 08/08921-0 - The influence of total and REM sleep deprivation on free recall of word in healthy young subjects
Grantee:Gislaine de Almeida Valverde Zanini
Support type: Scholarships in Brazil - Master