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Rape paralysis

Immobility during a sexual assault

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Through Human body, Reflex and Biology

In modern science, increasingly more is understood about when, how, and why paralysis occurs. However, public awareness about paralysis is still limited, which has negative consequences for the prevention, punishment and processing of sexual violence. Paralysis is sometimes also called freezing, although scholars prefer avoiding this word usage to prevent confusion with the 'freeze' (hypervigilance) response that usually precedes it (see below).

Scientific explanations

In the scientific and scholarly literature, distinctions are made between several survival reactions which humans (and sometimes non-human animals) either consciously or unconsciously employ in order to survive when confronted with a potentially life-threatening situation. Terms used include:

  • Prevent (or avoid)
  • Freeze (also known as hypervigilance: to be cautious, aware or alert)
  • Flight
  • Fight
  • Compromise (or keeping the peace)
  • Fright, faint, paralysis, tonic immobility, or playing dead

In 1988, American psychologist J. A. Gray was the first to propose the sequence freeze, flight, fight, fright. He built on the existing concept in psychology (and later biology) of combing the responses flight and fight as a "fight-or-flight response" (first suggested by psychologist Walter Bradford Cannon in 1929; later scientists concluded that the usual sequence is first flight, and only then fight). A person sometimes still has the option of trying to keep the peace and negotiate a compromise with the person threatening them; by cooperating and offering concessions, the threatened person thereby tries to contain the damage that the aggressor is seeking to inflict on them. Paralysis or tonic immobility is the action threatened humans and animals perform whenever all other options have been exhausted: in physical contact with the aggressor, they pretend that they are dead, and thus attempt to survive the dangerous situation. Burgess & Holstrom (1976) proposed the term rape paralysis as a synonym; in the early 21st century the term tonic immobility became more common. Dutch psychologist Agnes van Minnen (2017) proposed prevent or avoid (voorkomen) as an extra strategy which precedes freeze or hypervigilance: try to prevent/avoid ending up in dangerous situations in the first place.

In child psychology, the terms freezing or freeze have sometimes been applied to the last phase of fright (tonic immobility, paralysis), but because the earlier phase of freeze (hypervigilance, being alert) has already been described by that word in ethology, this has caused a lot of confusion.

There is a fixed logic behind this sequence of survival reactions: the brain automatically considers all available options, according to the order of the reaction leading to the smallest risk of damage to the body to the reaction with the most risk. As soon as danger is detected, all possibilities are considered, and the safest available option is often employed unconsciously within milliseconds as a reflex. Paralysis is employed whenever all other options have been exhausted, and the brain decides to undergo the looming sexual violence in hopes of protecting the body against death. For example, if the threatened person would run too great a risk of being killed by trying to fight back against the aggressor, the brain could decide on paralysis in order to allow the body to survive. Aside from humans, tonic immobility is also a survival response in all other mammals, which is applied whenever fleeing or fighting would increase the risk of dying and would therefore not be the best options (anymore). Therefore, scientists think that tonic immobility as a survival response is the best explanation of why some humans paralyse when threatened by or during sexual violence.

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