Speed & accuracy trade-off of a network using an internal noise source. A. Mean proportion of correctly selected choices relative to different motion strength values (0%, 3.2%, 6.4%, 12.8%, 25.6%, 51.2% & 100%) in a two (red) and four (black) choice discrimination task. Each dot represents the mean value of 1,000 trials. B. Mean reaction times (ms) of selected choices relative to the different motion strength values (0%, 3.2%, 6.4%, 12.8%, 25.6% & 51.2%). Each dot represents a mean value over 1,000 trials. C. The proportion of altered decisions relative to the motion strength (3.2%, 6.4%, 9.6% & 12.8%). The network is comprised of two pools of 50 neurons each integrating evidence in favor of a specific choice. On separate trials, a spike was added to a single neuron in favor of selecting the incorrect choice. The mean proportion of changed decisions was measured over 50 trials (1 spike/neuron for a total of 50 neurons) for each coherence value. Error bars are standard error.