The concept of herbal medicines has been evolved from the various traditional medical systems i.e. Ayurveda, Siddha, and Unani which were found mentioned in the ancient Vedas and other scriptures. It provides the concept of positive health means metabolically well-balanced human beings to live a long healthy life by rejuvenate the body through diet and nutrition. According to the World Health Organization (WHO) major population of some Asian and African countries presently uses herbal medicine for some aspect of primary health care as well as for treatment of diseases and disorders . The synthetic drugs are more costly, having narrow margin of safety and more side effects as compared to herbal drugs which have wide margin of safety, cheaper andmild side effects than synthetic drugs.
Herbal drugs have enormous therapeutic potential for central nervous system (CNS) activity and peripheral nervous system (PNS) activity. During the history of mankind, drugs acting the CNS have focused on those that bring relief to psychiatric disorders and herbal therapy can still provide support having mental problems that also develop symptoms of anxiety, depression and sleep disturbances etc. Dementia, Parkinson disease (PD), Alzheimer's disease (AD) etc are CNS associated problems which are being addressed by herbal treatment. Extensive research is going on for suitable approach using novel approaches to get result which can reduce the toxicity as well as increase thepharmacological activity of the drug .
Learning or acquisition is defined as the process of acquiring knowledge about the environment around the organism, while memory is the storage or retention of this acquired knowledge which can be retrieved later. Learning and memory are the basic constituents of cognitive behavior and processed through neurons of specific areas of thebrain with the specific modality of sensory information.
The hippocampus and amygdala are relevant to the storage of recent memory and emotional behavior. The structure of these areas is highly plastic, particularly in the hippocampus while the amygdala acts as a part of a larger intermediate memory system that supports learning and performance before habit consolidation. Report on study ofmonkeys explained that these areas interact with each other while operate independently