Reflex reaction is an immediate involuntary response to a stimulus. The reflexes developed by training and learning are called conditioned or acquired reflexes. During learning, these activities occur under cerebral control, but once established these occur by habit as reflexes. Some common examples are dancing, cycling, playing, driving etc.
In the reflex reactions, a sensory impulse reaching central nervous system (brain or spinal cord) is itself returned to an effector as a motor impulse withcut neuronal analysis and integration. Naturally the necessary response automatically and suddenly occurs almost as soon as a stimulus is received. The common examples are sudden withdrawl of hands or feet with a jerk, from sudden contact with hot or cold or sharp object etc.