TY - JOUR
T1 - Sex-related differences in the effects of sleep habits on verbal and visuospatial working memory
AU - Nakagawa, Seishu
AU - Takeuchi, Hikaru
AU - Taki, Yasuyuki
AU - Nouchi, Rui
AU - Sekiguchi, Atsushi
AU - Kotozaki, Yuka
AU - Miyauchi, Carlos M.
AU - Iizuka, Kunio
AU - Yokoyama, Ryoichi
AU - Shinada, Takamitsu
AU - Yamamoto, Yuki
AU - Hanawa, Sugiko
AU - Araki, Tsuyoshi
AU - Kunitoki, Keiko
AU - Sassa, Yuko
AU - Kawashima, Ryuta
N1 - Publisher Copyright:
© 2016 Nakagawa, Takeuchi, Taki, Nouchi, Sekiguchi, Kotozaki, Miyauchi, Iizuka, Yokoyama, Shinada, Yamamoto, Hanawa, Araki, Kunitoki, Sassa and Kawashima.
PY - 2016/7/28
Y1 - 2016/7/28
N2 - Poor sleep quality negatively affects memory performance, and working memory in particular. We investigated sleep habits related to sleep quality including sleep duration, daytime nap duration, nap frequency, and dream content recall frequency (DCRF). Declarative working memory can be subdivided into verbal working memory (VWM) and visuospatial working memory (VSWM). We hypothesized that sleep habits would have different effects on VWM and VSWM. To our knowledge, our study is the first to investigate differences between VWM and VSWM related to daytime nap duration, nap frequency, and DCRF. Furthermore, we tested the hypothesis that the effects of duration and frequency of daytime naps and DCRF on VWM and VSWM differed according to sex. We assessed 779 healthy right-handed individuals (434 males and 345 females; mean age: 20.7 ± 1.8 years) using a digit span forward and backward VWM task, a forward and backward VSWM task, and sleep habits scales. A correlation analysis was used to test the relationships between VWM capacity (VWMC) and VSWM capacity (VSWMC) scores and sleep duration, nap duration, nap frequency, and DCRF. Furthermore, multiple regression analyses were conducted to identify factors associated with VWMC and VSWMC scores and to identify sex-related differences. We found significant positive correlations between VSWMC and nap duration and DCRF, and between VWMC and sleep duration in all subjects. Furthermore, we found that working memory capacity (WMC) was positively correlated with nap duration in males and with sleep duration in females, and DCRF was positively correlated with VSWMC in females. Our finding of sex-related differences in the effects of sleep habits on WMC has not been reported previously. The associations between WMC and sleep habits differed according to sex because of differences in the underlying neural correlates of VWM and VSWM, and effectiveness of the sleep habits in males and females.
AB - Poor sleep quality negatively affects memory performance, and working memory in particular. We investigated sleep habits related to sleep quality including sleep duration, daytime nap duration, nap frequency, and dream content recall frequency (DCRF). Declarative working memory can be subdivided into verbal working memory (VWM) and visuospatial working memory (VSWM). We hypothesized that sleep habits would have different effects on VWM and VSWM. To our knowledge, our study is the first to investigate differences between VWM and VSWM related to daytime nap duration, nap frequency, and DCRF. Furthermore, we tested the hypothesis that the effects of duration and frequency of daytime naps and DCRF on VWM and VSWM differed according to sex. We assessed 779 healthy right-handed individuals (434 males and 345 females; mean age: 20.7 ± 1.8 years) using a digit span forward and backward VWM task, a forward and backward VSWM task, and sleep habits scales. A correlation analysis was used to test the relationships between VWM capacity (VWMC) and VSWM capacity (VSWMC) scores and sleep duration, nap duration, nap frequency, and DCRF. Furthermore, multiple regression analyses were conducted to identify factors associated with VWMC and VSWMC scores and to identify sex-related differences. We found significant positive correlations between VSWMC and nap duration and DCRF, and between VWMC and sleep duration in all subjects. Furthermore, we found that working memory capacity (WMC) was positively correlated with nap duration in males and with sleep duration in females, and DCRF was positively correlated with VSWMC in females. Our finding of sex-related differences in the effects of sleep habits on WMC has not been reported previously. The associations between WMC and sleep habits differed according to sex because of differences in the underlying neural correlates of VWM and VSWM, and effectiveness of the sleep habits in males and females.
KW - Dream content remembering frequency (DCRF)
KW - Nap duration
KW - Sleep duration
KW - Verbal working memory capacity (VWMC)
KW - Visuospatial working memory capacity (VSWMC)
UR - http://www.scopus.com/inward/record.url?scp=84982236575&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84982236575&partnerID=8YFLogxK
U2 - 10.3389/fpsyg.2016.01128
DO - 10.3389/fpsyg.2016.01128
M3 - Article
AN - SCOPUS:84982236575
SN - 1664-1078
VL - 7
JO - Frontiers in Psychology
JF - Frontiers in Psychology
IS - JUL
M1 - 1128
ER -