Simplified Compartmental Models of CA1 Pyramidal Cells of Theta-Modulated Inhibition Effects on Spike Timing-Dependent Plasticity

  • Vassilis CutsuridisEmail author
Part of the Springer Series in Computational Neuroscience book series (NEUROSCI)


Spike timing-dependent plasticity (STDP) is a causal form of Hebb’s law of synaptic plasticity, where the precise timing of the presynaptic and postsynaptic action potentials determines the sign and magnitude of synaptic modifications (Bell et al. 1997; Bi and Poo 1998; Magee and Johnston 1997; Markram et al. 1997; Debanne et al. 1998; Sjostrom et al. 2001; Yao and Dan 2001; Zhang et al. 1998). In their pioneering study, Bi and Poo (1998) showed that the shape of the STDP curve in the in vitro hippocampal network has an asymmetric shape with the largest LTP/LTD value at Δτ = tposttpre = +/−10 ms, respectively. New experimental evidence has shown that the STDP asymmetry can sometimes change with the target and the location of the synapse (Tzounopoulos et al. 2004; Froemke et al. 2005; Letzkus et al. 2006; Caporale and Dan 2009) and can be dynamically regulated by the activity of adjacent synapses (Harvey and Svoboda 2007; Caporale and Dan 2009) or by the action of neuromodulators (Seol et al. 2007; Caporale and Dan 2009). Nishiyama et al. (2000) reported that “…the profile of STDP induced in the hippocampal CA1 network with inhibitory interneurons is symmetrical for the relative timing of pre- and postsynaptic activation.” Optical imaging studies in CA1 revealed that the shape of the STDP curve depends on the location on the stratum radiatum (SR) dendrite. A symmetric STDP profile was observed in the proximal-to-the-soma SR dendrite and an asymmetric STDP profile in the distal-to-the-soma one (Tsukada et al. 2005; Aihara et al. 2007). They suggested that this change in the shape of the STDP curve (i.e., from symmetry to asymmetry and vice versa) may be due to inhibition in the proximal SR dendrites (Tsukada et al. 2005). The functional consequences of such a change in the STDP temporal kernel dynamics are of great importance in neural network dynamics. A symmetrical STDP profile with short temporal windows may serve as a coincidence detector between the incoming inputs and plays a functional role in heteroassociation of memories (Cutsuridis et al. 2010). On the other hand an asymmetric STDP profile with broad temporal windows may play a role in chunking of ordered items in sequence learning (Hayashi and Igarashi 2009).


Synaptic plasticity STDP Theta inhibition Hippocampus CA1 Pyramidal cell Computer model 


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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.School of Computer ScienceUniversity of LincolnLincolnUK

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