The principles and practices of Yoga are dealing with the regulation of the changing modes of the thought patterns or mental modifications. This process is called as Yoga where the mind field experiences the state of the harmony. Yoga Training Course brings the picture on the Psychology of Yoga which explains the nature of mental modifications and their number based on the type of the experiences. The mental modifications are painful and nonpainful. Sometimes the expression of energy in our body and mind takes place in a rhythmic and structured way, this is a more harmless condition, whereas some time they behave in an erratic expression leading to abnormal expression of energy. These are considered to be the harmful experiences of the mental modifications.
Mental modifications are broadly divided into five types. Each of them provides the experiences in the different dimensions for our life. They are;
1)Pramana is valid cognition which takes place through the means of sense perception, inference and testimony. This modification of the mental field develops the correct picture of the mental image and that of the actual image. This is processed on the basis of the presence of the object on the ground for the production of the cognition.
2)Viparyaya is invalid cognition which is formed on the basis of the information on the similar characteristics of the object. The mental image and the actual Image are mismatching in this experience. Pramana and Viparaya both require an object in the field to bring about the modification.
3)Vikalpa is a fantasy in which the image of the mind is there but there is no image of the object on the ground. It is a vague notion of the things which is devoid of the object in reality for the modification.
4) Nidra is deep sleep in which the mental content is disassociated from the sensory experience.
5)Smriti is a memory in which the recollection of the experienced experiences takes place, This will be possible on account of the role of the first two types of the mental modifications
In order to maintain the harmony, it is important to control the mind. The Curriculum of Yoga Philosophy provides two means to regulate mental modifications. They are,
1) Practice: It is choosing an effort and establishing in it till it brings the sthithi or tranquility of the mind. The solid ground on the practice is achieved through the longtime, uninterrupted and dedicated practice.
2) Dispassion: It is the perfection in the mastery of the consciousness in which there is no craving for the sensory experiences whether it is seen or unseen experience.
The mastery on these two means brings the peace of mind.