withdrawal symptoms refer to physical or psychological symptoms such as convulsions, tremor, vomiting, insomnia , anxiety , muscle pain and sweating that follow the abrupt discontinuation of a drug that produces physical dependence . It is a physical illness and discomfort following the withdrawal of a drug.
group of participants. It is a research paradigm in which the same experimental subjects participate in different experimental conditions . Moreover, it is a research design that uses each participant as his or her own control ; for example, the behavior of a participant before receiving treatment might be compared to his or her behavior after receiving treatment. Within-subjects design is allso known as Repeated-measures design.