A theory of communication arguing that people adjust their speech and gestures to accommodate to others with whom they are interacting.

(particle physics) A proposal for the resolution of the strong CP problem. It proposes that the QCD Lagrangian be extended with a CP-violating term known as the θ parameter, and that this should be a dynamic field rather than a constant value. It also predicts the existence of particles called axions.

A theory of cognition according to which visual and verbal information are both used to represent information, but processed in different ways.

A speculative theory of the origins of spoken language, according to which all things have a vibrating natural resonance, echoed somehow in the earliest words of human beings.

(philosophy) A metaethical theory stating that an action is morally good if commanded by God and morally bad if forbidden by God.

The idea that ghosts and hauntings are analogous to tape recordings, and that electrical mental impressions released during emotional or traumatic events can somehow be "stored" in stone and other materials and "replayed" under certain conditions.

The theory (coherent scientific explanation of an observable fact) that some diseases are caused by microorganisms.

The theory of the psychological process whereby deliberate attempts to suppress certain thoughts make them more likely to surface.

A speculative theory that human language originated from the imitation of animal vocalisations.

A speculative theory that human language originated from emotional exclamations of pain, pleasure, surprise, etc.