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Psychopharmacology is the study of the effects of any psychoactive drug that acts upon the mind by affecting brain chemistry. Amanita muscaria (the common Fly Agaric) is often regarded as the first such drug, with modern theories positing the discovery of its psychoactive properties circa 10,000 BCE. Modern psychopharmacology studies a wide range of chemicals with many different types of effect.

History


Psychoactive drug use predates recorded history. Hunter-gatherer societies tended to favor hallucinogenic drugs, and today their use can still be observed in many surviving tribal cultures. The exact drug used depends on what the particular ecosystem a given tribe lives in can support, and are typically found growing wild. Such drugs include various hallucinogenic mushrooms and cacti, along with many other plants. These societies generally attach spiritual significance to drug use, and often incorporate it into their religious practices.

With the dawn of the Neolithic and the proliferation of agriculture, new entheogens came into use as a natural by-product of farming. Among them were opium, cannabis, and alcohol derived from the fermentation of cereals and fruits. Most societies began developing herblores, lists of herbs which were good for treating various physical and mental ailments. For example, St. John's Wort was traditionally prescribed in Europe for depression (in addition to use as a general-purpose good-tasting tea), and Chinese medicine developed elaborate lists of herbs and preparations.

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pubmed: 0278-5846

Alterations of the amplitude of low-frequency fluctuations in treatment-resistant and treatment-response depression: A resting-state fMRI study.
Guo WB, Liu F, Xue ZM, Xu XJ, Wu RR, Ma CQ, Wooderson SC, Tan CL, Sun XL, Chen JD, Liu ZN, Xiao CQ, Chen HF, Zhao JP Alterations of the amplitude of low-frequency fluctuations in treatment-resistant and treatment-response depression: A resting-state fMRI study. Prog Neuropsychopharmacol Biol Psychiatry. 2012 Jan 28; Authors: Guo WB, Liu F, Xue ZM, Xu XJ, Wu RR, Ma CQ, Wooderson SC, Tan CL, Sun XL, Chen JD, Liu ZN, Xiao CQ, Chen HF, Zhao JP Abstract BACKGROUND: Patients with treatment-resistant depression (TRD) and those with treatment-response depression (TSD) respond to antidepressants differently and previous studies have commonly reported different brain networks in resistant and nonresistant patients. Using the amplitude of low-frequency fluctuations (ALFF) approach, we explored ALFF values of the brain regions in TRD and TSD patients at resting state to test the hypothesis of the different brain networks in TRD and TSD patients. METHODS: Eighteen TRD patients, 17 TSD patients and 17 gender-, age-, and education-matched healthy subjects participated in the resting-state fMRI scans. RESULTS: There are widespread differences in ALFF values among TRD patients, TSD patients and healthy subjects throughout the cerebellum, the visual recognition circuit (middle temporal gyrus, middle/inferior occipital gyrus and fusiform), the hate circuit (putamen), the default circuit (ACC and medial frontal gyrus) and the risk/action circuit (inferior frontal gyrus). The brain circuits between the TRD and TSD patients are mainly in the cerebellum, the visual recognition circuit and the default circuit. CONCLUSIONS: The affected brain circuits of TRD patients might be partly different from those of TSD patients. PMID: 22306865 [PubMed - as supplied by publisher]
A proton magnetic resonance spectroscopy study in schizoaffective disorder: Comparison of bipolar disorder and schziophrenia.
Kalaycı D, Ozdel O, Sözeri-Varma G, Kıroğlu Y, Tümkaya S A proton magnetic resonance spectroscopy study in schizoaffective disorder: Comparison of bipolar disorder and schziophrenia. Prog Neuropsychopharmacol Biol Psychiatry. 2012 Jan 28; Authors: Kalaycı D, Ozdel O, Sözeri-Varma G, Kıroğlu Y, Tümkaya S Abstract The aim of this study was to compare schizoaffective disorder, bipolar disorder and schizophrenia based on (1)H-MRS metabolite values in dorsolateral prefrontal cortex and executive functions. The subjects comprised 15 patients with bipolar disorder type I (BD), 15 with schizophrenia (SCH), 15 with schizoaffective disorder (SAD) and 15 healthy controls. We performed proton magnetic resonance spectroscopy ((1)H-MRS) of the dorsolateral prefrontal cortex (DLPFC) bilaterally. Levels of N-acetyl aspartate (NAA), choline-containing compounds (Cho) and creatine-containing compounds (Cr) were measured in the DLPFC using (1)H-MRS. We administered the Wisconsin Card Sorting Test (WCST) and the Stroop Test (ST) to evaluate executive functions. The SAD, BD and SCH patients had lower levels of NAA than the control group. The SAD and BD patients had low levels of Cho compared to the control group. The left DLPFC Cr levels in all of the patient groups and the right DLPFC Cr levels in the BD and SAD groups were lower than in the control group. The levels of NAA Cho and Cr were not related to executive functions and attention performance. Cr level were related to attention processes, only in SCH. Our results indicate that NAA levels are reduced in schizoaffective disorder, bipolar disorder and schizophrenia, but the reduction in the levels of NAA is not a distinctive feature among these three illnesses. Schizoaffective and bipolar disorders have similar features related to the levels of compounds containing Cho and Cr. This similarity may be related to these illnesses both having an affective basis. PMID: 22306485 [PubMed - as supplied by publisher]

 
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