Abstract
Rationale
The head-twitch response (HTR) is a rapid side-to-side rotational head movement that occurs in rats and mice after administration of serotonergic hallucinogens and other 5-HT2A agonists. The HTR is widely used as a behavioral assay for 5-HT2A activation and to probe for interactions between the 5-HT2A receptor and other transmitter systems.
Objective
High-speed video recordings were used to analyze the head movement that occurs during head twitches in C57BL/6J mice. Experiments were also conducted in C57BL/6J mice to determine whether a head-mounted magnet and a magnetometer coil could be used to detect the HTR induced by serotonergic hallucinations based on the dynamics of the response.
Results
Head movement during the HTR was highly rhythmic and occurred within a specific frequency range (mean head movement frequency of 90.3 Hz). Head twitches produced wave-like oscillations of magnetometer coil voltage that matched the frequency of head movement during the response. The magnetometer coil detected the HTR induced by the serotonergic hallucinogens 2,5-dimethoxy-4-iodoamphetamine (DOI; 0.25, 0.5, and 1.0 mg/kg, i.p.) and lysergic acid diethylamide (LSD; 0.05, 0.1, 0.2, and 0.4 mg/kg, i.p.) with extremely high sensitivity and specificity. Magnetometer coil recordings demonstrated that the non-hallucinogenic compounds (+)-amphetamine (2.5 and 5.0 mg/kg, i.p.) and lisuride (0.8, 1.6, and 3.2 mg/kg, i.p.) did not induce the HTR.
Conclusions
These studies confirm that a magnetometer coil can be used to detect the HTR induced by hallucinogens. The use of magnetometer-based HTR detection provides a high-throughput, semi-automated assay for this behavior, and offers several advantages over traditional assessment methods.








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Acknowledgments
This study was supported by National Institute on Drug Abuse Awards R01 DA002925 and F32 DA025412, and the Veterans Affairs VISN 22 Mental Illness Research, Education, and Clinical Center.
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Fig. S1
Magnetometer coil responses induced by grooming behavior. a Voltage response of the magnetometer coil during grooming. b Periodogram showing the spectral density of the magnetometer response to grooming (TIFF 929 kb)
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Halberstadt, A.L., Geyer, M.A. Characterization of the head-twitch response induced by hallucinogens in mice. Psychopharmacology 227, 727–739 (2013). https://doi.org/10.1007/s00213-013-3006-z
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DOI: https://doi.org/10.1007/s00213-013-3006-z