p543fig15.06 The circuit between dentate granule cells and CA1 hippocampal pyramid cells seems to compute spectrally timed responses.  See the text for details.<BR>||  Hippocampal interpretation.  1. Dentate granule cells (Berger, Berry, Thompson 1986): "increasing firing...in the CS period...the latency...was constant".   2. Pyramidal cells: "Temporal model"  Dentate granule cells-> CA3 pyramids.   3. Convergence (Squire etal 1989): 1e6 granule cells, 1.6e5 CA3 pyramids.  80-to-1 (ri).