Free Will and Determinism

Free will is the idea that humans are able to make their own choices and are self-determining. On this view, our behaviour is not controlled by internal biology or external circumstances: we are the authors of what we do, and we could have acted otherwise.

This does not mean free will ignores biology and environment altogether. It means that, even with those influences present, a person can reject or override them and choose a course of action for themselves.

The humanistic approach is the clearest advocate of free will in psychology. Humanistic psychologists such as Rogers and Maslow argue that people are active agents who shape their own development. Healthy growth, in this view, depends on taking personal responsibility for your choices rather than seeing yourself as the product of forces you cannot control.

Free will: the idea that we are able to make our own choices and are self-determining, not controlled by internal or external forces. The humanistic approach argues for free will.

Because free will is a synoptic issue (Paper 3, Section A), you are expected to illustrate it using topics from across the specification, not to discuss it in the abstract.

Determinism is the opposing view: that behaviour is caused or determined by internal or external factors that are beyond the individual's control. If behaviour is caused, then in principle it is predictable, and the sense that we freely chose it is a description of the experience rather than the cause of the action.

Determinism comes in two strengths, and telling them apart is where most marks are won or lost.

Position	Core claim	Is free will possible?	Fits which approach
Hard determinism	All behaviour has a cause; free will is an illusion	No — free will does not exist	Behaviourist, biological
Soft determinism	Behaviour is constrained by causes but conscious choice remains	Yes, within limits	Cognitive

Hard determinism (also called incompatibilism) holds that every action is the inevitable result of prior causes. Free will is an illusion: it feels as if we choose, but the choice was already fixed by biology, environment or the unconscious.

Soft determinism, argued by the psychologist and philosopher William James, holds that behaviour is constrained by internal and external forces but people can still exercise conscious choice within those constraints. Free will and determinism are therefore compatible — this is why soft determinism is described as a compatibilist position, and the cognitive approach fits it well.

Soft determinism is not the same as free will. It still accepts that behaviour has causes; it simply allows room for conscious choice inside those causes.

Determinism also comes in three flavours, sorted by where the cause is located. Each maps onto an approach you have already studied, so learning the pairing gives you ready-made synoptic examples.

Type	Behaviour is caused by	Key figure / approach	Course example
Biological determinism	Genes, brain structure, hormones, neurotransmitters	Biological approach	The MAOA "warrior gene" linked to aggression; low serotonin linked to OCD
Environmental determinism	Conditioning and features of the environment (reinforcement history)	Skinner, behaviourist approach	A phobia acquired through classical conditioning and maintained by avoidance
Psychic determinism	Unconscious conflicts and early childhood experiences	Freud, psychodynamic approach	Adult behaviour driven by fixation at an unresolved psychosexual stage

Biological determinism explains behaviour through factors inside the body: inherited genes, the structure and activity of the brain, hormone levels and neurotransmitters. For example, the influence of dopamine and serotonin on mood is a biologically determinist claim.

Environmental determinism locates the cause outside the person, in their history of conditioning. Skinner described free will as "an illusion" and argued that all behaviour is the product of a lifetime of reinforcement: we do what we have been rewarded for doing.

Psychic determinism places the cause in the unconscious mind. Freud argued that there are no accidents in behaviour, not even slips of the tongue; adult actions are driven by unconscious conflicts and early experiences we cannot access or control.

Determinism is tightly linked to the aims of science. A basic assumption of science is that every event has a cause that can, in principle, be identified. Psychology has largely modelled itself on the natural sciences, which is one reason determinism has been so influential in the subject.

The tool that delivers causal explanations is the controlled laboratory experiment. By manipulating an independent variable (IV) while holding everything else constant, a researcher can measure its effect on a dependent variable (DV) and establish cause and effect.

If behaviour has predictable causes, it can be studied this way, predicted and even controlled — for example, using drug treatments that target the neurotransmitters thought to cause a disorder. Free will, by contrast, is far harder to fit into this model, because a genuinely free choice has no prior cause to isolate.

Determinism suits the scientific method: it assumes behaviour is caused, and causes can be isolated, measured and predicted in controlled conditions.

Examiners reward developed AO3 points that weigh both sides. Below are four you can use, each anchored to research from across the course.

Free will has face validity and practical value. The idea that we choose our actions matches everyday experience, which gives it intuitive strength. It may also benefit mental health: people with an internal locus of control (a belief that they determine their own outcomes) tend to be more resilient and, in social influence research, better able to resist pressure to conform or obey. Believing you have choice appears to be good for you, which counts in free will's favour.

Free will is hard to test scientifically, and neuroscience challenges it. Because a free choice has no measurable cause, free will resists empirical study. Libet et al. (1983) asked participants to flick their wrist whenever they chose while their brain activity was recorded. The readiness potential — the brain activity preparing the movement — appeared around half a second before participants reported being consciously aware of deciding to move. This suggests the decision may be determined at a neural level before we experience choosing it.

Libet's findings are debated. Some argue the conscious mind can still "veto" an action after the readiness potential begins, so the study does not fully disprove free will — but it does challenge the idea that conscious choice starts the action.

Determinism is consistent with science, but hard determinism has troubling implications. Its causal stance allows prediction and control, as seen in drug treatments for disorders like OCD and depression. However, hard determinism clashes with the principle of moral and legal responsibility: if a person's behaviour is entirely determined, it becomes difficult to argue they should be held accountable for it. Courts, which assume people choose their actions, do not accept "my brain made me do it" as a defence.

Soft determinism may be the most reasonable position. An interactionist stance that accepts behaviour has causes while allowing conscious choice within those constraints avoids the extremes. It fits how most psychologists actually work: they look for causes of behaviour without denying that people deliberate and decide.

1. Confusing the three types of determinism

Biological, environmental and psychic determinism differ only in where the cause sits: inside the body (genes, hormones, neurotransmitters), in the environment (conditioning and reinforcement), or in the unconscious mind (early experience). Mixing them up, or giving Skinner's reinforcement as an example of biological determinism, loses easy marks. Learn one clear example for each.

2. Treating soft determinism as the same as free will

Soft determinism still says behaviour is caused; it only adds that conscious choice operates within those causes. It is a form of determinism, not a version of free will. Describing it as "free will with a different name" misrepresents the position.

3. Not linking approaches to positions

Each approach takes a stance, and naming the link earns synoptic credit:

Approach	Position on the debate
Humanistic	Free will
Behaviourist	Environmental determinism
Biological	Biological determinism
Psychodynamic	Psychic determinism
Cognitive	Soft determinism

Forgetting these pairings makes an answer vague and general when the question rewards specific illustration.

4. Not using the Libet evidence

Evaluation questions want research, not just opinion. Libet et al.'s readiness potential is the standard evidence that decisions may be determined before we are consciously aware of them. An answer that argues about free will without any evidence stays at a lower level than one that cites Libet.

5. Treating determinism as a synonym for biology

Determinism is a broad debate, not a synonym for the biological approach. Environmental and psychic determinism are just as determinist as biological determinism. Reducing the whole debate to genes and brains ignores two-thirds of the specification content.