<P> John Bowlby was originally a follower of the Freudian tradition at the Tavistock Clinic in London, but broke away from Freud's key ideas and revolutionised the field . Bowlby's inspiration came from reading the work of Konrad Lorenz, the famous Nobel Prize--winning founder of the field of ethology or animal behaviour . In particular Bowlby was struck by the phenomenon of imprinting, which Lorenz had studied in birds, and he saw the possibility that infants might imprint on their mother in a similar way . Along with his student Mary Ainsworth he studied infant behaviour, and developed what he called attachment theory . He rejected Freud's ideas of damage caused by frustrated impulses, in favour of the idea that maternal deprivation is a major cause of disturbed development and later psychological problems . Later he realised that infants need a stable, safe person or persons to provide a feeling of security from which they can venture out and explore . Many other workers in the field have since carried out experiments on infants and on animals which seem to confirm and refine this idea . </P> <P> Bowlby's attachment theory is widely considered to be the basis of most current research, and to have put the field formerly known as psychoanalysis on a more scientifically based, experimentally testable, footing . Bowlby's work led to a major change in hospital practice in the UK, where children admitted to hospital had not been allowed visits from parents during their stay . Contact with parents was said to unsettle the children and interfere with ward routine . Today, parents are encouraged to stay with their children in UK hospitals, or visit whenever they want . </P> <P> At present, psychodynamics is an evolving multi-disciplinary field which analyzes and studies human thought process, response patterns, and influences . Research in this field provides insights into a number of areas, including: </P> <Ol> <Li> Understanding and anticipating the range of specific conscious and unconscious responses to specific sensory inputs, as images, colors, textures, sounds, etc . </Li> <Li> Utilizing the communicative nature of movement and primal physiological gestures to affect and study specific mind - body states . </Li> <Li> Examining the capacity for the mind and senses to directly affect physiological response and biological change . </Li> </Ol>

Who was the major psychologist behind the psychodynamic approach of understanding behavior