Universalism

A theoretical orientation that considers basic psychological processes as shared characteristics of all people, and cultural context as influencing their development and manifestation.  See Cross-cultural psychology, Emic-etic distinction, Psychic unity of mankind, Relativism (or cultural relativism)

Universal

A psychological concept, or a relationship between concepts, that appears suitable for the description of the psychological functioning of people in any cultural group.  See Emic-etic distinction, Universalism

Unimanual task

A task that can be performed with only one hand (e.g., reaching for and grasping an object, holding and using a pencil, hammering a nail into the wall once the nail is set, pouring water from a carafe into a glass, or moving and inserting pegs into a peg-board).  See Bimanual task, Handedness, Lateral bias

Ultimate mechanisms (or causes)

Determinants that have been incorporated into a system over many thousands of generations (i.e., over evolutionary time) by means of natural selection or other evolutionary mechanisms (e.g., genetic drift in isolated populations). See Causality (in philosophy), Evolutionary psychology, Genetic drift (or random walk), Proximate mechanisms (or causes)