Radical behaviourism is an offshoot of behaviourism which was first described by B.F Skinner. Radical behaviourism is different from earlier ideas of behaviourism because, rather than ignoring internal states like emotions and thoughts, it viewed them as just another type of behaviour, meaning that they could be measured and determined in the same way as observable actions.
One radical behaviourist was Clark Hull, who believed all human behaviour could be explained in terms of physics and maths – he was quoted as saying “a psychologist should not only understand mathematics, but think in mathematics”. Hull’s Mathematico-Deductive Theory was based on creating precise, standardised definitions for factors which affected the probability that a specific Stimulus would lead to a specific Response.
Naming that probability “E”, for Excitation Potential, Hull tried to transform identified factors, such as Inhibition, Fatigue and Motivation, into mathematical functions that predicted people’s behaviour.
This produced mathematical formulae that he believed explained behaviour, such as E = (sHr x D x K x V x J). That formula says: the probability of the Response happening is equal to the number of times the person has been trained to associate the Stimulus with the Response (sHr), multiplied by the person’s motivation to perform the Response (D), multiplied by the size of the Response (K), multiplied by how intense the Stimulus was (V), multiplied by the delay between the Stimulus and Response (J).
Each variable was given a precise operational definition, to aid Hull’s research and replication. Hull hoped to make psychology as scientific and precise in its predictions as physics or chemistry.
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