Automatism

Automatism is a plea by a defendant in a criminal case that their actions were not under the control of their conscious mind. A successful plea of automatism negates the conduct element of the actus reus of the alleged offence.

Automatism as a defence

Where the defendant exercised some control

If a defendant is to be held criminally liable, they need to demonstrate voluntary behaviour. Involuntary behaviour in legal terms can occur in two ways: by loss of physical control, or impaired consciousness.

Precedents in UK Law

Woolmington v DPP [1935]

Established that, subject to limited exceptions, the burden was on the prosecution to prove the defendant’s guilt beyond reasonable doubt. Emphasis was placed on the requirement in criminal law that a voluntary, willed act on the part of the defendant was essential for criminal liability.

Bratty v Attorney General for Northern Ireland [1961]

“No act is punishable if it is done involuntarily’. Lord Denning clarified an involuntary act as one “done by the muscles without any control by the mind such as a spasm, a reflex action or a convulsion; or an act done by a person who is not conscious of what he is doing such as an act done whilst suffering from concussion or whilst sleepwalking.”

Current Developments in UK Law

The Draft Criminal Code includes within the definition of automatism an movement which:

Is a reflex, spasm or convulsion; or occurs while he is in a condition ... depriving him of effective control of the act.

While less harsh than the existing equirement of total deprivation of control, this Code has not yet become law.

References

Case Law: Woolmington v DPP [1935] Bratty v Attorney General for Northern Ireland [1961] Broome v Perkins [1987] (Div. Ct.) Attorney General’s Reference (No 2. of 1992) [1993] CA