(a) Two individual driving effort sub-modules responding for only positive and only negative inputs respectively.

Abstract

<p>The overall drive effort variable <i>v</i>_<i>z</i> equals the sum of <i>v</i>_<i>z</i>+ and <i>v</i>_<i>z</i>−. (b) and (c) Asymmetric STDP curves attained by employing different resistance values in the two driving sub-modules and modifying bipolar threshold values (<i>B</i>₊ = 0.31nV, <i>B</i>₋ = −0.27nV) to compensate for STDP curve drift. Inset: Corresponding STDP curves with original bipolar threshold values (<i>B</i>₊ = −<i>B</i>₋ = 0.35nV).</p