Hebbian plasticity

A synapse is strengthened only when it helps fire the cell. Present a pattern on its own, then pair it with a postsynaptic spike, and watch which weights move. Weights carry over between protocols until you reset them.

Protocol run in order

Settings

Cell fires 10 ms after the pattern
Real time

Readout

Membrane potential−70.0 mV
Cell firing rate0.0 Hz
Group A weight1.20 mV
Group B weight1.20 mV
Background weight1.20 mV
Pattern alone → spike—

Last 20 presentations. Filled means the synapses alone reached threshold, before any current pulse.

Membrane potential & input raster 2 s window · ▲ injected current pulse

The cell circle size = synaptic weight

Synaptic weights EPSP amplitude, mV · dashed = starting value