Philosophical Assumptions: Selectionism, Determinism, Empiricism, Parsimony, and Pragmatism
Key Takeaways
- Selectionism explains behavior as the product of consequences across phylogenic, ontogenic, and cultural levels.
- Determinism assumes behavior is lawful and influenced by variables, even when those variables are not yet known.
- Empiricism requires objective observation and measurement rather than appeal to opinion or theory alone.
- Parsimony favors simpler explanations before more complex ones, and pragmatism values useful action tied to outcomes.
Why Assumptions Matter
Domain A items often test the assumptions behind a decision. The question may not name determinism, empiricism, or parsimony. Instead, it may ask what a BCBA should do when data are limited, a team offers a mentalistic explanation, or an intervention is selected because it sounds convincing.
Core Assumptions
| Assumption | Exam-Ready Meaning | Applied Move |
|---|---|---|
| Selectionism | Behavior is selected by consequences across evolutionary, learning, and cultural histories | Look for reinforcement histories and current contingencies |
| Determinism | Behavior is lawful and influenced by variables | Keep assessing instead of calling behavior random |
| Empiricism | Knowledge comes from observation and measurement | Use data before conclusions |
| Parsimony | Rule out simpler explanations first | Check definitions, measurement, and obvious contingencies |
| Pragmatism | Truth is evaluated by practical effect | Choose actions that improve prediction and outcomes |
Selectionism is central to behavior analysis. Behavior that contacts reinforcement is more likely to occur in similar contexts. Cultural practices can also be selected when they produce consequences for a group.
Determinism does not mean every variable is easy to find. It means the BCBA assumes behavior is not capricious or caused by inner traits that end the analysis. The correct answer keeps searching for functional variables.
Empiricism separates behavior analysis from explanation by authority. A supervisor, parent, or teacher may have useful observations, but the BCBA still needs direct or defensible data to support decisions.
Parsimony is a common exam trap. If a learner stops responding, first consider simple behavior-analytic possibilities such as unclear instructions, weak reinforcement, satiation, extinction, or measurement error before complex explanations.
Pragmatism does not mean doing whatever is easiest. In behavior analysis, practical value is judged by whether the approach helps prediction, influence, and socially meaningful improvement while staying conceptually and ethically sound.
Fast Sorting Rule
When an answer says behavior is unknowable, choose against it. When an answer says measure, test, replicate, or examine contingencies, it is usually closer to Domain A.
A learner's requests increased after requests consistently produced access to preferred items. Which assumption is most directly illustrated?
Staff say a client's self-injury is random because it occurs in several rooms and with several people. What response best reflects determinism?
A team proposes a complex sensory explanation before checking whether task difficulty changed. Which assumption should guide the BCBA first?