Deutsch: Onkologie / Español: Oncología / Português: Oncologia / Français: Oncologie / Italian: Oncologia

Oncology in the context of psychology refers to the psychological and emotional aspects of cancer diagnosis, treatment, and survivorship. This field, often termed psycho-oncology, involves the study and practice of psychological responses to cancer at all stages of the disease, including prevention, diagnosis, treatment, survivorship, and end-of-life Care.

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One person Psychology the view, in Psychoanalysis, that the patient is influenced by the analyst, but the analyst is not influenced by the patient

One-group posttest-only design refers to a non-experimental design in which a single group is exposed to only one (1) level of an independent variable.

One-group pretest-posttest design refers to a non-experimental design in which a single group is tested, exposed to only one level of an independent variable, and then retested; a non-experimental design involving one measurement before treatment and one measurement after treatment for a single group of participants.

One-person trap is when the consequences of a destructive behavior affect only the individual, such as overeating

One-to-one intervention to help the bereaved are programs that draw on those who have previously been bereaved or on trained laypersons to help bereaved persons

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One-to-one principle is a counting principle that states that there must be one and only one number name for each object counted

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One-trial learning refers to Guthrie's contention that the association between a pattern of stimuli and a response develops at full strength after just one pairing of the two (2).