Fig 6. Learning kernels of the four G-DHL differential components for a pair of pre-/post-synaptic spikes.

The three columns of graphs refer respectively to: ${\tau }_1=\frac{3}{2}{\tau }_2$; τ₁ = τ₂; ${\tau }_1=\frac{3}{4}{\tau }_2$. The four rows of graphs refer to the G-DHL different components: ‘p’ indicates the positive part of the eligibility-trace derivative and ‘n’ indicates its negative part. Small gray circles indicate maximum synaptic changes.