Neurobics are mental exercises, that claim to enhance the brain's performance. These exercises are described by Lawrence Katz and Manning Rubin in their book Keep Your Brain Alive, however they are not scientifically proven. The term neurobics was popularized by Lawrence Katz in 1999. It is presumed that unusual sensory stimulation and activities like non-routine actions and thoughts, produce more of such chemicals of the neurobiology system of body that encourage growth of new dendrites and neurons in the brain. Routine actions become so automatic to the individual that most of actions are done largely unconsciously. Such automated or unconscious actions require less activity in the brain, and exercise it less. With the help of neurobics exercises, it is claimed that one can stimulate the brain. An example of a neurobic exercise is to carry out a routine action such as dialing a phone number or brushing your teeth with your non-dominant hand, or performing a series of tasks with you eyes closed. Other neurobiologists suggest that neurobics can slow aging of the brain.