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In page Catatonia:
"Use of NMDA receptor antagonists including ketamine and phencyclidine (PCP) can lead to catatonia-like states. Information about these effects has improved scientific understanding of the role of glutamate in catatonia. High dose and chronic use of stimulants such as cocaine and amphetamines can lead to cases of catatonia, typically associated with psychosis. This is thought to be due to changes in the function of circuits of the brain associated with dopamine release.[citation needed]
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