|Pharmacology which is the branch of medicine and biology deals with the study of drug action in which psychiatric pharmacology deals with study of the drugs which have effect on thinking, mood, sensation and behavior. The drugs which effects nervous system are known as psychoactive drugs. Psychoactive drugs interact with particular receptors or target sites found in the nervous system to induce widespread changes in physiological or psychological functions. Scientific journal is a periodical publication intended to further progress of science, usually by reporting novel research. There are thousands of scientific journals in publication, and many more have been published at various points in the past. Most journals are highly specialized, although some of the oldest journals publish articles and scientific papers across a wide range of scientific fields. Scientific journals contain articles that are peer reviewed, to ensure that articles meet the journal's standards of quality, and scientific validity. The publication of the results of research is an essential part of the scientific method. If they are describing experiments or calculations, they must supply enough details that an independent researcher could repeat the experiment or calculation to verify the results. Each such journal article becomes part of the permanent scientific record.