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ERIC Number: EJ1151877
Record Type: Journal
Publication Date: 2017-Sep
Pages: 9
Abstractor: As Provided
ISSN: ISSN-0012-1649
Activity Level in the Lab: Overlap with Shyness Indicates It is More than Pure Motoric Activity
Frazier-Wood, Alexis C.; Saudino, Kimberly J.
Developmental Psychology, v53 n9 p1611-1619 Sep 2017
The observation that children's activity level (AL) differs between novel and familiar situations is well established. What influences individual differences in how AL is different across these situations is less well understood. Drawing on animal literature, which links rats' AL when 1st placed in a novel setting with novelty seeking phenotypes, and child temperament literature, which links AL, novelty response, and shyness, we hypothesized that shyness would be an important component of children's AL in a novel situation. We examined this using mechanically assessed AL from 2 situations (the home and the lab) and 2 measures of shyness (1 parent-rated and 1 observer-rated) on up to 313 twin pairs (145 monozygotic and 168 dizygotic), at 2 and 3 years of age. Biometric genetic models removed from lab AL the variance shared with home AL, representing what was different in AL when the child entered the lab compared to the home. We report that almost half (43%) of the genetic component of AL in the lab was independent of AL in the home, and this unique genetic component shared genetic covariance with shyness. Shyness influences AL in a novel situation such as the lab, indicating that mechanically assessed AL represents more than global motoric activity and provides information on a child's temperamental response to novelty.
American Psychological Association. Journals Department, 750 First Street NE, Washington, DC 20002. Tel: 800-374-2721; Tel: 202-336-5510; Fax: 202-336-5502; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: US Department of Agriculture; National Institute of Mental Health (DHHS/NIH)
Authoring Institution: N/A
Identifiers - Location: Massachusetts
Grant or Contract Numbers: CRIS3095001058; MH062375