**Name:**

stdp_triplet_synapse - Synapse type with spike-timing dependent

plasticity (triplets).

**Description:**

stdp_triplet_synapse is a connection with spike time dependent

plasticity accounting for spike triplet effects (as defined in [1]).

STDP examples:

pair-based Aplus_triplet = Aminus_triplet = 0.0

triplet Aplus_triplet = Aminus_triplet = 1.0

**Parameters:**

tau_plus double - time constant of short presynaptic trace

- (tau_plus of [1])

tau_plus_triplet double - time constant of long presynaptic trace

- (tau_x of [1])

Aplus double - weight of pair potentiation rule

- (A_plus_2 of [1])

Aplus_triplet double - weight of triplet potentiation rule

- (A_plus_3 of [1])

Aminus double - weight of pair depression rule

(A_minus_2 of [1])

Aminus_triplet double - weight of triplet depression rule

- (A_minus_3 of [1])

Wmax double - maximum allowed weight

States:

Kplus double: pre-synaptic trace (r_1 of [1])

Kplus_triplet double: triplet pre-synaptic trace (r_2 of [1])

**Transmits:**

SpikeEvent

**References:**

[1] J.-P. Pfister & W. Gerstner (2006) Triplets of Spikes in a Model

of Spike Timing-Dependent Plasticity. The Journal of Neuroscience

26(38):9673-9682; doi:10.1523/JNEUROSCI.1425-06.2006

Notes:

- Presynaptic traces r_1 and r_2 of [1] are stored in the connection as

Kplus and Kplus_triplet and decay with time-constants tau_plus and

tau_plus_triplet, respectively.

- Postsynaptic traces o_1 and o_2 of [1] are acquired from the post-synaptic

neuron states Kminus_ and triplet_Kminus_ which decay on time-constants

tau_minus and tau_minus_triplet, respectively. These two time-constants

can be set as properties of the postsynaptic neuron.

- This version implements the 'all-to-all' spike interaction of [1]. The

'nearest-spike' interaction of [1] can currently not be implemented

without changing the postsynaptic archiving-node (clip the traces to a

maximum of 1).

**Author:**

Abigail Morrison, Eilif Muller, Alexander Seeholzer, Teo Stocco

Adapted by: Philipp Weidel

**FirstVersion:**

Nov 2007

**SeeAlso:**

**Source:**

/home/nest/work/nest-2.14.0/models/stdp_triplet_connection.h