As an image is to visual sense, and a sound is to auditory sense, a thought is a unit of cognitive sense.
Every single thought – whether positive or negative – goes through the same cycle when it forms. Thoughts are basically electrical impulses, chemicals and neurons. They look like a tree with branches.
As the thoughts develop and become permanent, more branches grow and the connections become stronger. As we change our thinking, some branches go away, new ones form, the strength of the connections change, and the memories network with other thoughts. What an incredible capacity of the brain to change and rewire and grow! Spiritually, this is what we call renewing the mind.
As you think, your thoughts are activated, which in turn determines your attitude, because your attitude is all of your thoughts put together and reflects your state of mind. This attitude is formed in the chemical secretions that are released.
Positive attitudes cause the secretion of the correct amount of chemicals, and negative attitudes distort the chemical secretions in a way that disrupts their natural flow. The chemicals are like little cellular signals that translate the information of your thought into a physical reality in your body and mind, creating an emotion. The combination of thoughts, emotions and resulting attitude impacts your body in a positive or negative way. This means your mind and body really are inherently linked, and this link starts with your thoughts.
As you are reading, perhaps you have some classical music playing in the background. You might be sitting in a comfortable chair, smelling the freshly mowed lawn through an open window and savoring a piece of fruit. If you were in this idyllic setting, all five of your senses – sight, sound, smell, touch and taste – would be your contact between the external world and your internal world, thereby activating your mind.
Sourced from https://www.quora.com/Philosophy-of-Mind/What-is-a-thought … …