|Reference code: ||PT/FB/BL-2010-055.08|
|Location: ||Arquivo PCA - Pasta 10/2010|
|REM sleep EEG theta activity is a negative correlate of attachment anxiety|
|Publication year: ||2011|
Several behavioural correlates of EEG theta activity were reported previously. Some of these correlates
were shown to be trait-like in nature belonging to the affective domain. Frontal theta activity measured during wakeful resting conditions was found to be a negative correlate of anxiety-related measures mainly. However, knowledge on the trait-like affective correlates of REM sleep theta activity is sparse. Based on the intimate relationship between REM sleep and attachment, as well as on the neurobiology of this sleep state we hypothesize that REM sleep frontal theta activity is negatively correlated with measures of attachment anxiety (AAn). As Heart Rate Variability (HRV) as an indicator of the sympatovagal balance was shown to be related to theta activity, we also hypothesized that REM sleep HRV is related to both theta activity and AAn.
35 subjects (20 men, Mage=31.6 years) slept two consecutive nights in the sleep laboratory. Polysomnography covered EEG, EOG, and ECG. Power spectra of whole second night NREM and REM sleep
EEG as well as spectral HRV measures of the ECG in NREM and REM sleep were calculated. Subjects filled
the Relationship Scales Questionnaire measuring adult attachment along the dimensions of AA and attachment avoidance (AAv). Pearson correlations between log-normalized 0.25 Hz wide EEG power bins and attachment, between log-normalized EEG power and HRV, as well as between HRV and attachment were calculated.
Significant negative correlations between REM sleep EEG power and AAn were observed at frequencies pertaining to the theta range (4.75-7.5 Hz) in the fronto-central and temporal regions. These correlations were specific to REM sleep as NREM sleep theta EEG power was found to be uncorrelated with AAn. The hypothesized correlations between REM sleep theta EEG power and HRV, or AAn and HRV were not supported by our data. Unpredicted correlations were negative between AAn and REM sleep frontal beta (12.25-20.25 Hz) power, and positive between AAv and NREM sleep alpha/sigma (8-13 Hz) power.
Frontal theta activity and HRV are unrelated, perhaps physiologically uncoupled during REM sleep. REM sleep theta EEG, but not HRV is negatively associated with questionnaire measures of AAn.
|Accessibility: ||Document exists in file|
|Secondary author(s): |
|Simor, P., Körmendi, J., Csóka, S., Ujma, P., Sándor, P., Horváth, K., Harmat, L.|
|Document type: |
|Bódizs, R., Simor, P., Körmendi, J., Csóka, S., Ujma, P., Sándor, P., Horváth, K., & Harmat, L. (2011). REM sleep EEG theta activity is a negative correlate of attachment anxiety. In Abstracts of the 43rd European Brain and Behaviour Society Meeting (p. 69). Seville, Spain: EBBS.|
|Indexed document: ||No|
|Keywords: ||Attachment anxiety / Polysomnography / REM sleep / EEG theta activity|
REM sleep EEG theta activity is a negative correlate of attachment anxiety