Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Hallucinogens induce the head-twitch response HTR , a rapid reciprocal head movement, in mice.
Although head twitches are usually identified by direct observation, they can also be assessed using a head-mounted magnet and a magnetometer.
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Procedures have been developed to automate the analysis of magnetometer recordings by detecting events that match the frequency, duration, and amplitude of the HTR. However, there is considerable variability in the features of head twitches, and behaviors such as jumping have similar characteristics, reducing the reliability of these methods.
We have developed an automated method that can detect head twitches unambiguously, without relying on features in the amplitude-time domain. To detect the behavior, events are transformed into a visual representation in the time-frequency domain a scalogram , deep features are extracted using the pretrained convolutional neural network CNN ResNet, and then the images are classified using a Support Vector Machine SVM algorithm.
These procedures were used to analyze recordings from mice containing 11, HTR. The procedures were insensitive to other behaviors, including jumping and seizures.
