Figure 1.
The representative histological cresyl violet stained sections and a drawing of a coronal section of a rat brain 6.48 mm from bregma illustrate the locations of electrodes in the CA1 radiatum layer (Rad), in the molecular layer of the dentate gyrus (MoDG) and in the ventral subiculum (VS). Adapted from [54].
Figure 2.
Experimental stimuli. In each of the four stimulus conditions, a duration deviant tone (D) was interspersed with a repeated standard tone (S).
In the SSI200/SDI200 and SSI500/SDI500-conditions, the duration of the deviant was 25 ms of the standard 75 ms. In the SSI200/SDI500 and SSI500/SDI200-conditions, each duration was assigned to each stimulus type in separate series. Otherwise, the four conditions differed in stimulus-onset-asynchrony (200 ms or 500 ms) between consecutive standards (SSI) and between deviants and their immediately preceding standards (SDI).
Figure 3.
LFPs in response to different stimulus types in different stimulus conditions. The zero time point is at the moment of change, that is, at 25 ms from tone onset and, thus, at the offset of the 25-ms tone. The two tones used as the deviant and the standard are illustrated above the x-axis of the panel for the auditory cortex. The three consecutive time segments for calculating average response amplitudes are illustrated in each panel. Significant differences in response amplitude between the deviant and the standard are marked between the curves. * P<0.05 and **P<0.01 in post-hoc uncorrected comparisons (paired t-tests).