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We are concerned about the main encoding granule cells (GCs) in thehippocampal dentate gyrus (DG). Young immature GCs (imGCs) appear through adultneurogenesis. In comparison to the mature GCs (mGCs) (born during development),the imGCs show high activation due to lower firing threshold. On the otherhand, they receive low excitatory drive from the entorhinal cortex viaperforant paths and from the hilar mossy cells with lower connectionprobability $p_c~(=20~x~\%)$ ($x:$ synaptic connectivity fraction; $ 0 \leq x\leq 1$) than the mGCs with the connection probability $p_c~(=20~\%)$. Thus,the effect of low excitatory innervation (reducing activation degree) for theimGCs counteracts the effect of their high excitability. We consider a spikingneural network for the DG, incorporating both the mGCs and the imGCs. Withdecreasing $x$ from 1 to 0, we investigate the effect of young adult-born imGCson the sparsely synchronized rhythms (SSRs) of the GCs (mGCs, imGC, and wholeGCs). For each $x$, population and individual firing behaviors in the SSRs arecharacterized in terms of the amplitude measure ${\cal M}_a^{(X)}$($X=m,~im,~w$ for the mGCs, the imGCs, and the whole GCs, respectively)(representing the population synchronization degree) and the randomphase-locking degree ${\cal L}_d^{(X)}$ (characterizing the regularity ofindividual single-cell discharges), respectively. We also note that, for $0\leq x \leq 1,$ the mGCs and the imGCs exhibit pattern separation (i.e., aprocess of transforming similar input patterns into less similar outputpatterns) and pattern integration (making association between patterns),respectively. Quantitative relationship between SSRs and pattern separation andintegration is also discussed.

Effect of Adult Neurogenesis on Sparsely Synchronized Rhythms of The Granule Cells in The Hippocampal Dentate Gyrus