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SpikeTimingDependentPlasticity

Abbreviated STDP. Sometimes the relative timing of spikes can induce LTP or LTD. For example, Bi and Poo found that in hippocampal glutamatergic synapses, if a presynaptic spike arrives shortly before a postsynaptic spike, the synapse is strengthened (LTP). If a presynaptic spike arrives shortly after a postsynaptic spike, the synapse is weakened (LTD).

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Quantitative Characterization

Bi an Poo have presented equations that characterize this behavior. Let

$\tau = t_{post} - t_{pre}$, the elapsed time between the presynaptic and postsynaptic spikes. Let $a_P$ and $a_D$ be constants. Let $g$ be the synaptic conductance. Let $\beta_P = \frac{1}{16.8}$ ms, and let $\beta_D = \frac{1}{33.7}$ ms. Now,

When $\tau > 0$,
$\frac{\delta g}{g} = a_P e^{\beta_P \tau}$

When $\tau < 0$,
$\frac{\delta g}{g} = -a_D e^{\beta_D \tau}$.

Models of STDP

Phenomenological models

Biological models

Uncategorized models

Models using STDP

Functions

STDP could do all sorts of things. But so far, theorists have used STDP for synaptic normalization, temporal pattern learning, and the formation of synchronizized neural ensembles. See also


Papers

Review papers

Functions


References

Data

Bi, G. & Poo, M.-m. (1998) J. Neurosci. 18, 10464 10472.

Bi, G. & Poo, M.-m. (2001) Annu. Rev. Neurosci. 24, 139 166. 8812 8821.

Feldman, D. (2000) Neuron 27, 45 46.

Froemke, R. C. & Dan, Y. (2002) Nature (London) 416, 433 438.

To do

CategoryTodo

5. Bienstock, E. L., Cooper, L. N. & Munro, P. W. (1982) J. Neurosci. 2, 32 48.

9. Senn, W., Markram, H. & Tsodyks, M. (2000) Neural Comp. 13, 36 67.

10. Migliore, M. & Lansky, P. (1999) Biophys. J. 77, 1234 1243.


CategoryPlasticity

CategorySynaptic