Effect of noise and STDP strength on learning performance.

<p>STDP strength is scale in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090821#pone.0090821.e008" target="_blank">equation 1</a> from the <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090821#s5" target="_blank">methods</a> section. (A) Plot of mean final performance with variable levels of variability in synaptic release. Twenty-five simulations were run under each noise condition and final performance was recorded after 4 million moves. Red dashed lines shows the limits of standard error. (B) Plot of mean performance over time with variable levels of variability in synaptic release represented by different lines. Twenty-five simulations were run under each noise condition over 8 million moves. Noise level: 2% orange, 4% gold, 8% dark green, 12% blue, 16% red, 32% magenta, 64% brown. (C) Plot of mean final performance with variable STDP coefficient strength. Twenty-five simulations were run under each STDP coefficient condition and final performance was recorded after 8 million moves. Two sets were run with different noise levels: 16% release noise is shown in blue and 8% is shown in green. Red lines show standard error. (D) Plot of mean performance over time for different STDP strength. Twenty-five simulations were run for each STDP strength over 8 million moves (4 million shown). Release noise is set to 16%. STDP strength: orange-0.25; gold-0.5; dark green-1; light blue-1.5; dark blue-2; purple-4; magenta-8; red-16.