Science is the systematic study of the structure and behaviour of the physical and natural world through observations and experiment . Science has a lot of disciplines so far as the study is concerned. Psychology on the other hand is the scientific discipline that studies human behaviour and mental processes as defined by Nevid (2006). Psychology applies the knowledge of science to build upon its theory .
Science is about collecting data through observations or experimentation . Observational methods in psychological research entail the observation and description of a subject behaviour. Researchers utilizing the observational method can exert varying amounts of control over the experiment in which observation takes place .
Therapist carry out observational assessment to evaluate how a patient uses movement during a task and how their mental , cognitive, communication and behavioural abilities affect task performance. Some of the famous experiments were the Little Albert Experiment in 1920 . Standard Prison experiment in 1971 and Miligram experiment in 1963 .
Scientific knowledge stands out as a fact and not truth because certain theories stand the risk of being debunked or modified when a new proposed idea sets in . Phrenology under psychology for instance was effectively debunked in the early mind 1800s by renowned French Physician Marie Jean Pierre ,who rejected that there was a correlation between bumps on the skul and the underlying shape of the brain . Equally liked to science is the idea of the world being flat debunked. Karl Popper says there cannot be no statements in science which cannot be tested and therefore one which cannot in principle be refuted by falsifying some of the conclusions which can be deduced from them .
There are of course health professionals who are taught psychology in a scientific way at school to equip them with skills to approach problems relating to human health. Health psychologists use knowledge of psychology and health to promote wellbeing and healthy behaviours, especially at population level. They are specially trained to understand the psychological and emotional aspects of health and illnesses identifying behaviours that may damage a person's health eg smoking, drug abuse, poor diet and how psychological theories and interventions can support prevention and health related behaviour change encouraging behaviours such as exercise, a healthy diet, oral hygiene, health checks/self-examination and attending preventative medical screenings.