Hippocampal excitability phase-locked to the theta rhythm in walking rats
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2014, NeuroImageCitation Excerpt :At the opposite phase, stronger excitatory currents in stratum radiatum (Brankack et al., 1993) could reflect previously strengthened synapses from region CA3 driving retrieval that causes spiking of CA1 pyramidal cells (Csicsvari et al., 1999; Fox et al., 1986; Skaggs et al., 1996) based on the pattern of previously encoded associations (Hasselmo et al., 2002a). Phasic changes in synaptic input could also arise from differences in presynaptic inhibition of synaptic transmission (Wyble et al., 2000) causing changes in size of synaptic potentials (Villarreal et al., 2007; Wyble et al., 2000) and population spiking (Buzsaki et al., 1981; Rudell et al., 1980; Villarreal et al., 2007), possibly due to presynaptic inhibition caused by GABAB receptors (Hasselmo and Fehlau, 2001; Molyneaux and Hasselmo, 2002). These phasic changes allow synaptic transmission in stratum radiatum to be weak when induction of long-term potentiation is strong during encoding (Hasselmo et al., 2002a).
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This work was supported in part by National Institutes of Health grant NS 14497 and National Science Foundation grant BNS 77-09375 to J. B. Ranck, and National Institutes of Health grant NS 10987 to V. E. Amassian.