Poster C35, Sunday, March 25, 1:00-3:00 pm, Exhibit Hall C
Different procrastination measures correlate with different neural activities
Zhoumao Duo1,2, Sunao Iwaki1,2; 1National Institute of Advanced Industrial Science and Technology, 2University of Tsukuba
Irrational Procrastination Scale (IPS) represents a widely recognized conceptualization, in which procrastination is defined as “the irrational delay”. However, the General Procrastination Scale (GPS), which describes procrastination as “postponing have-to-do things” is frequently used to measure the individual procrastination tendency. The primary objective of this study is to confirm whether the “procrastination” of two scales have a common neurological basis from the perspective of executive functions (EFs). During the block design fMRI experiments, participants performed N-back, Simon, and task-switching tasks to measure brain activities underlying three basic components of EFs, namely, working memory, inhibition control and, cognitive flexibility. IPS and GPS were used to characterize the individual procrastination tendency. The performance of n-back (n=21) and simon (n=26) did not show any significant correlation with IPS/GPS score. In task-switching (n=21), mixing cost of reaction time positively correlated with IPS scores (r=.53, p<.05). Main results of fMRI showed IPS scores negatively correlated (p<.05) with middle frontal gyrus (MFG) in all tasks (n-back: (left) r=-.50; simon: (left) r=-.42; task-switching: (right) r=-.47). GPS showed negative correlation (p<.05) with most regions’ activities in task-switching, but no significant correlation in simon. The results indicate that more efficient functional circuit of cognitive flexibility is associated with higher GPS’s tendency. In short, the IPS/GPS scores differently correlated with performance and brain activities relating to EFs suggested the different neural basis of IPS and GPS. This finding emphasized the importance of conceptional unification to study neural correlates of procrastination.
Topic Area: EXECUTIVE PROCESSES: Other