Cognitive science is the interdisciplinary scientific study of the mind in its processes. It examines the nature tasks and the functions of cognition. Cognitive scientists study intelligence and behaviour with a focus on how nervous systems represent, processes and transform information. The human brain weigh approximately 3 pounds or 1.4 kg. Although it only makes up about 2% of the total body weight of an adult human being. Brain tissue command a large amount of energy in proportion to its volume. Most of the brain energy consumption goes sustaining the the electrical charge of the neurones. Most vertebrae species, vote about two to eight percent of basic metabolism to the brain. In primates however the percentage is much higher in humans. It can rise to as much as 20 to 25 percent . The mind is composed approximately 100 billion neurones connected together into a neural network. Neural network are made of neurons and connection between them called axons which have synapse where the different neurone meet. Neurones generate electrical signals that travel along their axons. When a pulse of electricity reaches a junction called a synapse it causes neurotransmitter chemicals ti to be release. Which binds receptor on other cells and thereby alters their electrical activity. The property that makes neurones unique. Because the ability to send signals yo specific target cells over long distances. They send the signal by axons which is a thin protoplasmic fiber which extends from the cell body and projects usually with numerous branches to other areas. Sometimes nearby sometimes in distant parts of the brain or body. Each of the 100 billion neurones has on average 7 thousand synapse connections to other neurone. In its functioning neurone is a form of switch that is to say a cell taht is either on or off. Any given neurone has a number of inputs from other neurones. If those inputs are above a given threshold, then it is activated in fires. If the neurone is activated. It then sends out signals to other neurones that is connected to iys output then becomes the input to other neurones.