Rats enjoy music at the same beat as humans, according to a ScienceAdvances study, hinting at inherent neural processing across species. Learn more:
is the nose position and mean is the mean position of the right/left eye and right/left ear. We quantified the displacement instead of jerk in this video analysis because the sampling rate of the video acquisition was not sufficiently high to reliably quantify the jerk. To quantify the beat synchronization, the local maximum and local minimum of nose displacement was calculated.
To quantify the head movement, the displacement of the accelerometer holder was tracked in the video using the manually wrote Python code. The video was first cropped around the accelerometer holder. Each video frame was then transformed into a binary image to extract the red marker attached on the accelerometer holder, and the marker contour was detected using “findCounters” function in the OpenCV library. The contour center was regarded as the head position .
Rats were anesthetized with urethane administered intraperitoneally. Xylocaine was administered subcutaneously for local anesthesia. Atropine sulfate was administered intraperitoneally to reduce the viscosity of bronchial secretions. The parietal and right temporal tissues were removed. Cerebrospinal fluid was drained to avoid edema. An M1 × 3-mm screw was drilled into the left parietal bone to contact the dura and was used as a reference electrode.
To identify the location of the auditory cortex, click-evoked LFPs were measured on the cortical surface. Each click was a positive-first biphasic square pulse with a duration of 50 μs per phase. The array was positioned so as to cover the entire click-evoked activation and slowly inserted into the cortex. To confirm that the electrode reached the fourth layer of the auditory cortex, click-evoked LFP was constantly monitored.
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