Thought suppression is a psychoanalytical defense mechanism. It is a type of motivated forgetting in which an individual consciously attempts to stop thinking about a particular thought.[1][2] It is often associated with obsessive–compulsive disorder (OCD).[3] OCD is when a person will repeatedly (usually unsuccessfully) attempt to prevent or "neutralize" intrusive distressing thoughts centered on one or more obsessions. It is also thought to be a cause of memory inhibition, as shown by research using the think/no think paradigm.[4] Thought suppression is relevant to both mental and behavioral levels, possibly leading to ironic effects that are contrary to intention. Ironic process theory[5] is one cognitive model that can explain the paradoxical effect.
When an individual tries to suppress thoughts under a high cognitive load, the frequency of those thoughts increases and becomes more accessible than before.[6][7] Evidence shows that people can prevent their thoughts from being translated into behavior when self-monitoring is high; this does not apply to automatic behaviors though, and may result in latent, unconscious actions.[8] This phenomenon is made paradoxically worse by increasing the amount of distractions a person has, although the experiments in this area can be criticized for using impersonal concurrent tasks, which may or may not properly reflect natural processes or individual differences.
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