Poster No:
766
Submission Type:
Abstract Submission
Authors:
Sunao Iwaki1
Institutions:
1AIST, Tsukuba, -- SELECT --
First Author:
Introduction:
Locus of Control (LoC) represents an individual's perceived control over life outcomes, a psychological construct that significantly influences various behavioral domains, particularly academic performance and health-related behaviors (Rotter, 1966). LoC varies along a spectrum from internal to external control: individuals with high internal LoC attribute life events primarily to their own actions and decisions, whereas those with high external LoC tend to attribute outcomes to external factors beyond their control. Despite extensive behavioral research on LoC, the neural substrates underlying individual differences in this personality dimension remain largely unexplored. The present study investigates the relationship between LoC variability and white matter integrity in young adults, hypothesizing that individual differences in LoC correlate with structural variations in white matter architecture.
Methods:
Fifty-eight young adults participated in the study. Written informed consent was obtained from all subjects before the experiment complying with the policies of the internal review board of AIST. Subjects' locus of control was assessed by Japanese version of Locus of Control Questionnaire (Kamahara et al., 1982), which consists of 18 items with 4-point scales. The MRI data were acquired on a 3-T MR scanner (Philips Ingenia 3T). Fractional anisotropy (FA) maps were derived from diffusion tensor imaging (DTI) scans (TR=18,496 ms, TE=60 ms, FA=90 deg, b-factor=1,000, 70 axial slices with 2 mm slice thickness) and used as a measure of white matter fiber integrity.
Results:
Results of the correlation analysis between the internal LoC score and the FA maps show positive correlation in the bilateral posterior cingulate and the precuneus. The cortical areas adjacent to these regions are reported to be responsible for self-consciousness, self-related mental representation (Cavanna et al., 2006) and have dense connection to hippocampus where significant correlation between its volume and LoC have been observed (Pruessner 2005). These regions are also known as central nodes of the human default mode network which regulates internally-directed thought (Buckner et al., 2008).
Conclusions:
The current results indicate that the white matter integrity in the posterior cingulate and the precuneus might affect default mode network which explains individual difference in LoC.
Emotion, Motivation and Social Neuroscience:
Social Neuroscience Other 2
Higher Cognitive Functions:
Higher Cognitive Functions Other 1
Keywords:
MRI
STRUCTURAL MRI
WHITE MATTER IMAGING - DTI, HARDI, DSI, ETC
1|2Indicates the priority used for review
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Please indicate below if your study was a "resting state" or "task-activation” study.
Other
Healthy subjects only or patients (note that patient studies may also involve healthy subjects):
Healthy subjects
Was this research conducted in the United States?
No
Were any human subjects research approved by the relevant Institutional Review Board or ethics panel?
NOTE: Any human subjects studies without IRB approval will be automatically rejected.
Yes
Were any animal research approved by the relevant IACUC or other animal research panel?
NOTE: Any animal studies without IACUC approval will be automatically rejected.
Not applicable
Please indicate which methods were used in your research:
Structural MRI
Diffusion MRI
For human MRI, what field strength scanner do you use?
3.0T
Which processing packages did you use for your study?
SPM
FSL
Provide references using APA citation style.
Buckner R et al. (2008). The brain's default network: anatomy, function, and relevance to disease, Ann NY Acad Sci, 1124, 1-38.
Cavanna AE et al. (2006). The precuneus: a review of its functional anatomy and behavioural correlates, Brain, 129, 564-583..
Kamahara M et al. (1982). New locus of control scale: Its reliability and validity, Jpn. J. Educ Psychol., 30, 302-307. (In Japanese).
Pruessner JC et al. (2005). Self-esteem, locus of control, hippocampal volume, and cortisol regulation in young and old adulthood, Neuroimage, 28, 815-826.
Rotter, J.B. (1966). General expectancies for internal versus external control of reinforcement, Psychological Monographs, 80, 1-28.
No