The Sanskrit word skandha means "heap" or "aggregate." The Buddha taught that an individual is a combination of five aggregates of existence, called the Five Skandhas. These are:1.Form
2.Sensation
3.Perception
4.Mental formations
5.Consciousness
Various schools of Buddhism do not interpret the skandhas in exactly the same way. Generally, the first skandha is our physical form. The second is made up of our feelings, emotional and physical, and our senses -- seeing, hearing, tasting, touching, smelling.
The third skandha, perception, takes in most of what we call thinking -- conceptualization, cognition, reasoning. This also includes the recognition that occurs when an organ comes into contact with an object. Perception can be thought of as "that which identifies." The object perceived may be a physical object or a mental one, such as an idea.
The fourth skandha, mental formations, includes habits, prejudices and predispositions. Our volition, or willfulness, also is part of the fourth skandha, as are attention, faith, conscientiousness, pride, desire, vindictiveness, and many other mental states both virtuous and not virtuous. The causes and effects of karma are especially important to the fourth skandha.
The fifth skandha, consciousness, is awareness of or sensitivity to an object, but without conceptualization. Once there is awareness, the third skandha might recognize the object and assign a concept-value to it, and the fourth skandha might react with desire or revulsion or some other mental formation. The fifth skandha is explained in some schools as base that ties the experience of life together.
The Buddha taught that our egos, personalities and the sense that the "self" is something distinctive and permanent enclosed within our bodies, are just illusory effects of the skandhas.
