Trupinić, Matija.
(2013).
Activational effects of testosterone on spatial abilities.
Diploma Thesis. Filozofski fakultet u Zagrebu, Department of Psychology.
[mentor Hromatko, Ivana].
Abstract
The aim of this study was to check if there are diurnal variations in different aspects of spatial abilities that could be explained by assumed activational effects of testosterone, and if they exist, to determine whether they are identical for all categories of spatial abilities. Since testosterone levels show diurnal variations only in male participants, female participants were used as a comparable group. A sample of 125 students of Faculty of Humanities and Social Sciences and Faculty of Kinesiology from University of Zagreb solved three visuo-spatial tests for three categories of spatial abilities: mental rotation, spatial perception and spatial visualization. Participants solved all tests two times in a repeated measures design; once in the morning, second time in the evening, and the order of testing was rotated. Interval between two measurements was approximately one week. Repeated measures ANOVA was used to determine within- and between-group differences at the follow-up. Results indicate that activational effects had influence only on mental rotations test. Although the main effect of time of day was not statistically significant, a triple interaction between gender, time of day and order of testing was statistically significant. Since mental rotations test was the only gender-biased test in this study, these findings are in accordance with previous studies, which show that activational effects affect performance only in gender-biased tests.
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