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Differential Consolidation and Pattern Reverberations within Episodic Cell Assemblies in the Mouse Hippocampus

Figure 7

Effects of event-intensity on CA1 cell responsiveness.

(A) A representative CA1 unit shows intensity-dependent modulation of its firing changes in response to different drop heights from 5, 13 and 30 cm (upper, middle and lower raster, respectively). Time is represented on the horizontal X-axis (−3 to 3 seconds) and the trial number is listed on the vertical Y-axis. The vertical red line indicates t = 0. (B) The frequency responses of the same unit (shown in A) obtained by smoothing the spike count through an asymmetric kernel indicate that this neuron increases its firing rate monotonically in response to drop heights. (C) Spike rasters of a CA1 cell that show a intensity-dependent unit which increases its firing in response to various amount of air-blow (for the durations of 200 ms, 400 ms, and 800 ms (upper, middle and lower panel, respectively). (D) The frequency responses obtained by smoothing the spike count through an asymmetric kernel indicate that this CA1 neuron increases its firing rate monotonically over change of stimuli amounts. (E) A representative CA1 unit that exhibit invariant firing increase over changes of drop heights (from 5, 13 and 30 cm; upper, middle and lower raster, respectively). (F) Smoothed frequency responses confirm that this neuron is invariant to drop heights. (G) Spike rasters for a representative neuron that responds in an invariant fashion to air-blow stimuli. (H) Smoothed frequency responses indicate that this CA1 neuron responds in an invariant fashion to the amount of air being blown. (I) The percentages of units that belong to specific, subgeneral and general populations are represented schematically by the size of the corresponding circles. 0.20 = 20%. 0.26 = 26%, and 0.54 = 54%. In addition, the partition between intensity-invariant and intensity-sensitive are displayed in light blue and orange-red.

Figure 7

doi: https://doi.org/10.1371/journal.pone.0016507.g007