Computation and classification by cultured neuronal networks.

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Computation and classification by cultured neuronal networks. Computation and classification by cultured neuronal networks. A, Implementing switches. Two readouts were used. The first readout was trained to switch on (to output “1”) when Keys 1 or 2 were pressed and switch off (to output “0”) when Keys 3 or 4 were pressed. For the second readout, Key 1 toggles the switch: if the switch was on, Key 1 turned it off; if it was off, Key 1 turned it on. Key 2 holds the current on/off state, Key 3 is an on-switch, and Key 4 is an off-switch. Red curve indicates the target output. Blue curve indicates the response of the readouts. B, Encode music as light patterns. Twenty stimulation sites (circles) were selected, each representing a piano key. When a piano key is pressed and held, its corresponding circle will be illuminated with an intensity value proportional to the key's velocity (how forcefully the key is pressed). C, Transcription of a 10-s-long classical music segment not used during training, taken form an impromptu composed by Schubert (D.395 #1). D, A 30 s fragment of the Schubert impromptu, after transposition and encoding. Each note is represented by a horizontal bar. Each bar's gray level represents its key velocity. The transcription in C is the first10 s of this musical segment. E, Readout output when the stimulus in D was presented. The readout was trained to output 1 for classical music stimulus and 0 for ragtime. F, Network responses recorded from MEA electrodes. The readout output in E had large fluctuations when network bursts occurred and was reset to chance level (0.5). Han Ju et al. J. Neurosci. 2015;35:4040-4051 ©2015 by Society for Neuroscience