Optical BtBIs (IMAGE) Science China Press Caption An optical BtBIs transmits information regarding locomotor speed across brains. (A) Schematic of the optical BtBI. The authors used fiber photometry to record the population Ca2+ signals of NI neurons from the Master mouse, transformed the signals to blue laser pulses, and delivered the laser pulses into the NI of the Avatar mouse. DM, dichroic mirror; PMT, photomultiplier tube; DAQ, data acquisition. (B) Example traces showing, from the top to the bottom, the locomotor speed of the Master, the Ca2+ signal of NI neurons from the Master, the signal transformation formula, frequency modulation of light pulses, and the locomotor speed of the Avatar. (C) Locomotor speeds of a representative BtBI dyad. (D) Correlation between Master's speed and Avatar's speed (a representative BtTI dyad). Relative incidence means the probability of specific Master's speed and the corresponding Avatar's speed on all recording data. (E) Quantification of information transfer rate of the control group (n = 12 dyads) and the BtBI group (n = 14 dyads). Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.