Effect of sleep deprivation on nonverbal intelligence, working memory, processing speed and psychomotor skills : a study in Bangladesh
This dissertation joins a vibrant conversation in the field of cognitive psychology about the challenging nature ofperception and reality in sleep-cognition study. Human performances are interdependent on sleep-wake rhythm. Strong relationships has been observed between sleep and cognitive performan...
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| Format: | Thesis Book |
| Language: | English |
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| Summary: | This dissertation joins a vibrant conversation in the field of cognitive psychology about the challenging nature ofperception and reality in sleep-cognition study. Human performances are interdependent on sleep-wake rhythm. Strong relationships has been observed between sleep and cognitive performances. The assumption sleep deprivation (SD) causes problems to cognition and behavior, is widely discussed in western societies, particularly in United States. After carrying out a systematic review of the literature it has been observed that there is a deemed necessity to investigate the SD and its effect on cognition in Eastern, African and other cultural milieu with the objective of knowing about sleep-cognition tie to draw more concluding remarks on the field. The significance of studying both cultural diversities and cognitive processes with a purpose to understand human behaviour and cognition in inexorable. The present study has been carried out in South-Asian cultural setting, Bangladesh in particular, from developmental perspective. A considerable number of studies affirm the role of SD on sleep-dependent cognitive process, yet there are exceptions. Current study looked into the effect of Total Sleep Deprivation (TSD) on nonverbal intelligence (convergent thinking), working memory, processing speed, and psychomotor skills. Subjects were drawn from advertisement. A total of 146 subjects responded, where 100 subjects were chosen on the basis of exclusion-inclusion criteria. Subjects age ranged from 18 to 40 years as the vital working force belongs to this age group. The multimethod (multiple approach) research design was applied in this research to test the research hypothesis. Sequential design was followed to divide the subjects equally into control and experimental groups.The experimental group was given an intervention of total sleep deprivation for 24 hour a day, where the control group was treated with no such intervention. In addition, a matched group design with pre-test and post-test was also followed to investigate the effect of SD on cognition. A total of 69 participants completed the total procedure, out of which 36 were from control group and 33 were from experimental group. By analyzing the data following sequential design, we found a significant difference in psychomotor skills (t=-2.360,p<.05), and visual sequential memory - a component of working memory (t=3.914, p<.05), whereas no significant effects were observed in nonverbal intelligence (t=1.270, p>.05), working memory (t=1.071, p>.05) and processing speed (t=-.646, p>.05) between the experimental group (sleep deprived) and the control group (non-sleep deprived). An analysis on pre-test (prior intervention) and post-test data of sleep-deprived subjects revealed significant difference in nonverbal intelligence (t=6.840,p<.05), processing speed (t=-1.786, p<.05) and psychomotor skills (t=2.240, p<.05). However, no significant effect was observed in working memory (t=-.689, p>.05). The results have been discussed on the basis of existing findings and theories. Recently, the human dimentions of vulnerability to health, performance and cognitve ability due to SD have received significant attention in psychology, health science, sleep research, cognition and social science. The discussion on perception and cultural issues on sleep-cognition issue is important since perception on SD and its effect on cognitive performances has variability in respect pf cultural diversity. Human perception is always biased by cultures. The concept of culture and cultural influence on sleep-cognition link is crucial in understanding why culture matters because human psyche is better understood in the particular cultural setting where the individual lives. The concept of culture is treated as particular society, its specific cultural norms, its people's habit, attitude, perceptions prevail in other people's of different cultural settings. In conclusion, the findings of the present study show the viability of studying sleep-cognition link in other cultural context, assuming cultural differences are at the play on cognition, thus allowing investigators to significantly increase cultural validity over stereotyped data dependency. |
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| Physical Description: | xxiii, 244 leaves; 31 cm. |
| Bibliography: | Includes bibliographical references (leaves 163-187) |