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SPERMATORRHEA

a discharge of semen without an orgasm.

SPINA BIFIDA

a developmental defect where the vertebral canal does not close properly around the spinal cord. This neural defect consequently in

SPINOCEREBELLAR TRACT

nerve from the muscles to the spinal cord to the cerebellum.

SPLIT PERSONALITY

a lay term for a person with dissociative identity disorder.

SPONTANEOUS MOVEMENT

movement that results from an impulse that occurs without thought.

SPORT SOCIALIZATION

used to teach skills necessary to function well in a society by playing sport to better understand respect for authority

SQUID

Acronym for superconducting quantum interference device.

STABILIZING SELECTION

the tendency of natural selection to maintain the existing average population number over subsequent generations.

STAIRCASE PHENOMENON

1. Anything that shows a graduated step like change. 2. Cardiac muscle. The increase in the force when a heart

STANDARD SCORE

the score that is obtained from an original score by subtracting the mean value of all scores in the batch

STANOLONE

a semi-synthetic form of dihydrotestosterone used to treat some breast cancers.

STATES VERSUS TRANSFORMATIONS

Jean Piaget's theory. the extent to which a child's attention is focused on states, the appearance of an object, rather

STATUS

the state or position of a person or a group.

STEM CELL

an undifferentiated cell that can divide to produce any sort of specialised tissue. This can act as a continuous repair

STEREOPSIS

depth perception provided by retinal disparity of images. Also called stereoscopic depth perception.

STERILIZATION

the process through which an organism is made unable to reproduce normally. This can be done either by surgery or

STILES-CRAWFORD EFFECT

the perceived brightness or colour depending on whether the light rays enter the pupil near the centre or the edge.

STIMULUS DISCRIMINATION

being able to distinguish between different stimuli. See discrimination.

STIMULUS SITUATION

It is the situation that is perceived by an organism which then elicits a specific response. This term is used

STORAGE

term relating to the state of an item retained in a person's memory. See retention.