Figure 2.

Stimulus presentation protocol. A, Stimulus-specific memory trials. Thirty static patterns of randomly generated dots were presented to the neuronal network for 100–200 ms. Neuronal activity is recorded for 500 ms before stimulus onset and for 1–2 s after stimulus onset. B, Cue-Probe Short-term memory trials. Two stimuli were presented sequentially to the neuronal network: a cue stimulus followed by a probe stimulus after a short delay. The cue stimulus could be one of two (or four) random dot stimuli, whereas the probe stimulus was fixed across trials. Each stimulus was presented for 100–200 ms. Cue and probe stimuli are separated by a variable delay, ranging from 200 ms to 2 s.