How does behaviourism explain human actions through responses to external stimuli?

In the philosophy of social science, behaviourism explains human actions by focusing exclusively on observable, measurable data, treating the mind as an inaccessible "black box" that should be excluded from scientific analysis. Instead of relying on internal mental states, behaviourists posit that human actions are responses to external environmental stimuli.1234

This explanation is primarily grounded in two mechanisms:

• Classical Conditioning: Subjects produce involuntary, reflexive responses to stimuli through association, as seen in experiments where a neutral stimulus becomes linked to a biological one.5
• Operant Conditioning: Behaviour is shaped by its consequences. According to the law of effect, individuals are more likely to repeat actions that lead to positive outcomes (reinforcement) and avoid those that result in negative ones (punishment).156

By manipulating these environmental contingencies, behaviourists argue that social behaviour can be predicted and modified. This approach seeks to establish psychology and social science as objective, experimental fields by discarding introspection in favor of empirical observation of stimulus-response (S-R) patterns.172