Figure 6.

Downstream neuron input and response after learning (A) Input spike trains from afferents 150, …, 250, for the [0, 3]-s period. Spikes come in waves because of the oscillatory drive. Gray rectangles designate the periods where the pattern is presented, and the afferents that are involved in it (0, …, 199 here). Three inserts [horizontal grid size = 1 rad (in phase) = 20 ms] zoom on adequate periods to illustrate that the spike phases of the afferents involved in the pattern are the same (except for the noise) for different pattern presentations, which is not true for other afferents (200, …, 1999 here). The repetition of the pattern spike wave allows the pattern to be learned by STDP. (B) Postsynaptic membrane potential as a function of time: it oscillates at the same frequency as the afferents (and possibly with a phase lag due to conduction delays), but reaches the threshold if and only if the pattern is presented. See Masquelier et al. (2009) for details. Figure adapted from Masquelier et al. (2009).