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Most of the 'true' hallucinogens are classified as 5HT2A agonists. 5HT2A is a postsynaptic serotonin receptor. Serotonin-specific reuptake inhibitors (SSRIs) on the other hand act by increasing serotonin (5HT) levels in the brain, which in turn activates presynaptic 5HT1A receptors. Due to a continuous stimulation of these 5HT1A receptors they become ...


It is common for psychological tests to include multiple items with similar meaning. These items are then combined to form an overall scale score (e.g., depression or depressed thoughts). Multiple items with a similar meaning are used to increase the reliability of measurement, which is also important for validity. I don't think there is a huge difference ...

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