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

Autor(es)

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]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, UNIFESP, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Sleep; v. 35, n. 2, p. 223-230, FEB 1 2012.
• Citações Web of Science: 2

Resumo

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)

• Processo FAPESP: 06/58276-8 - Avaliação da densidade do transportador dopaminérgico utilizando [99mtc]-trodat e SPECT após privação de sono
• Beneficiário: Raquel Cristina Martins da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 98/14303-3 - Center for Sleep Studies
• Beneficiário: Sergio Tufik
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 08/08921-0 - A influência da privação de sono total e de sono REM sobre a recordação livre de palavras em sujeitos jovens saudáveis
• Beneficiário: Gislaine de Almeida Valverde Zanini
• Modalidade de apoio: Bolsas no Brasil - Mestrado