Skip to main content
. 2019 May 22;14(5):e0217025. doi: 10.1371/journal.pone.0217025

Fig 3. Association between behavioral state and eye state in fur seals in water.

Fig 3

(A) Standardized EEG power in the range of 1.2–4.0 Hz in two cerebral hemispheres (shown as percent of the average power in QW in the corresponding hemisphere) during QW, R-USWS, L-USWS, USWS (R-USWS and L-USWS) and REM sleep in 2 fur seals. (B) Total amount of the open state of the left and right eye during waking and sleep states. (C-E) Number and duration of the episodes of eye opening and closure during USWS (C, D) and QW (E). S and W correspond to sleeping and waking hemispheres. L and R correspond to left and right hemispheres or eyes. c-S and c-W correspond to which eye is contralateral to the sleeping and waking hemisphere, respectively. During QW the eyes were classified as c-S or c-W based on the adjacent USWS. Open circles represent the means for individual USWS, QW and REM sleep episodes recorded in 2 seals (S2 Table). Bars are grand average (mean) ± SEM for all episodes of QW and USWS. The difference between the power and the state of the eye was tested for all 7 episodes of USWS and 7 adjusted episodes of QW recorded in seals A and B. **,*** Statistical significance (the paired T-test) with p<0.01 and <0.001, respectively. ns–difference was not significant (p>0.05; S1 File).