TY  - JOUR
PY  - 2012//
TI  - Nonlinear indices of circadian changes in individuals with dementia and aggression
JO  - Psychiatry research
A1  - Etcher, Luann
A1  - Whall, Ann
A1  - Kumar, Rahul
A1  - Devanand, Davangere
A1  - Yeragani, Vikram
SP  - 77
EP  - 78
VL  - 199
IS  - 1
N2  - Nonlinear analyses of actigraphy data were utilized to investigate circadian rest-activity system motor control in nursing-home residents with dementia and with/without aggressive behavior (AB). Significant differences observed between groups in measures of approximate entropy (ApEn) and fractal dimension (FD). ApEn and FD are sensitive to detecting and characterizing discrete changes in central motoric control and temporality of behaviors in dementia. Findings may inform understanding of clinical heterogeneity and possible physiologic sub-classifications of Alzheimer's dementia.<p />  <p>Language: en</p>
LA  - en
SN  - 0165-1781
UR  - http://dx.doi.org/10.1016/j.psychres.2012.03.042
ID  - ref1
ER  -