The freezing response occupies a pivotal position in the depth-psychology corpus precisely because it marks the threshold where voluntary agency collapses and instinctual survival architecture takes command. The literature distributes its attention across three interlocking concerns: neurobiological mechanism, evolutionary function, and therapeutic consequence. Ogden’s sensorimotor framework distinguishes with precision between two phenotypically distinct variants — the high-sympathetic ‘alert immobility’ characterized by muscular tension, elevated heart rate, and hypervigilance, and the dorsal-vagal ‘feigned death’ or shutdown defense marked by flaccid musculature, hypoarousal, and analgesia. Levine, whose somatic experiencing paradigm anchors the evolutionary argument, insists that the human complication lies not in the freeze itself but in the neo-cortical prohibition against its discharge: the fear of death prevents the trembling completion that releases the animal. LeDoux contributes the neural circuitry, tracing the response hierarchy through defensive survival circuits in which freezing holds the lowest activation threshold and is therefore the first recruited. Nijenhuis extends the animal-defensive-response model into dissociation theory, arguing that tonic immobility constitutes a somatoform substrate for dissociative phenomenology. Siegel situates the response within the window-of-tolerance framework. The central tension in the corpus concerns whether freezing is best understood as a sympathetically mediated arrest or a parasympathetically mediated collapse — a distinction with direct clinical implications for trauma resolution.
freezing is markedly different from the arrest stage of orienting because the stimulus has already been assessed as dangerous and autonomic responses have already been significantly mobilized.
Ogden establishes the freezing response as a post-appraisal phenomenon distinct from ordinary orienting arrest, characterized by high sympathetic mobilization, muscular stiffness, and hyperalert immobility.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006thesis
The freeze response is characterized by high sympathetic nervous system arousal and hyper attentiveness, combined with a feeling of being unable to move. Tense muscles accompany this ‘alert immobility.’
Ogden formally differentiates the sympathetically driven freeze — tense, hyperaroused, paralyzed — from the dorsal-vagal shutdown defense, providing the clinical taxonomy essential to sensorimotor psychotherapy.
, Sensorimotor Psychotherapy Interventions for Trauma and, 2015thesis
The fear of death is another. Our neo-cortex informs us that immobility feels like death… These are not the only components that keep the freezing response from completion.
Levine argues that the human neo-cortex uniquely obstructs discharge from the freeze state by conflating immobility with death, thereby trapping residual survival energy and perpetuating traumatic symptoms.
, Waking the Tiger: Healing Trauma - The Innate Capacity to Transform Overwhelming Experiences, 1997thesis
The fear of death is another. Our neo-cortex informs us that immobility feels like death… These are not the only components that keep the freezing response from completion.
Levine’s parallel text reiterates that cortical fear of death — absent in non-human animals — is the primary mechanism preventing completion of the freeze cycle and thus resolution of trauma.
, Waking the Tiger: Healing Trauma—The Innate Capacity to Transform Overwhelming Experiences, 1997thesis
No animal, not even the human, has conscious control over whether or not it freezes in response to threat. When an animal perceives that it is trapped and can’t escape by running or fighting, freezing offers several advantages.
Levine grounds the freezing response in evolutionary necessity, cataloguing its survival advantages — mimicry of death, camouflage facilitation, and predator distraction — as context for understanding its involuntary, instinctual character.
, Waking the Tiger: Healing Trauma - The Innate Capacity to Transform Overwhelming Experiences, 1997thesis
No animal, not even the human, has conscious control over whether or not it freezes in response to threat. When an animal perceives that it is trapped and can’t escape by running or fighting, freezing offers several advantages.
Duplicate text from Levine elaborating the involuntary nature of the freeze and its adaptive logic within the predator-prey survival sequence.
, Waking the Tiger: Healing Trauma—The Innate Capacity to Transform Overwhelming Experiences, 1997thesis
Freezing has the lowest threshold and so is activated first. But then the prey’s changing position in the imminence sequence triggers the activation of a new response and the inhibition of other options.
LeDoux maps freezing onto a neurobiological threat-imminence hierarchy, identifying it as the default first-recruited defensive response within hardwired survival circuits, superseded only as proximity to threat changes.
, Anxious: Using the Brain to Understand and Treat Fear and Anxiety, 2015thesis
The medial CeA also sends outputs to the PAG to control freezing behavior… The CeA controls not only behavioral (freezing) responses but also changes in the body mediated by the autonomic nervous system and endocrine system.
LeDoux specifies the central amygdala–periaqueductal gray circuit as the neural substrate governing behavioural freezing, distinguishing this pathway from those mediating autonomic and endocrine components of threat response.
, Anxious: Using the Brain to Understand and Treat Fear and Anxiety, 2015supporting
In this variant of the immobilizing defensive responses, the muscles become flaccid rather than tense and stiff as they do in freezing… ‘muscles go limp, eyes look glazed, and heart rate slows down—just the opposite of what happens with the adrenaline burst of the freeze response.’
Ogden contrasts the freeze response’s sympathetic signature against the dorsal-vagal ‘floppy immobility’ of feigned death, clarifying that the two immobilizing defenses operate through opposing physiological mechanisms.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
It is generally agreed that when faced with threat to life, both animals and humans assume a state of freeze, that is, the organism becomes completely muscularly immobile, with diminished awareness.
Rothschild situates the freeze state within an arousal-regulation framework and introduces the clinically significant distinction between two categories of freeze corresponding to different autonomic profiles.
, The body remembers Volume 2, Revolutionizing trauma, 2024supporting
In a state of alert type 1 freezing, she remained immobile, muscles contracted to prepare for action, eyes glued to the man and the knife as she assessed options for action.
Ogden illustrates type 1 freezing through clinical vignette, showing that alert immobility retains cognitive function and threat assessment capacity while suspending gross motor action.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
When a traumatic event is so severe that the individual has no recourse but to freeze or submit, the defensive system becomes disorganized afterward: ‘When neither resistance nor escape is possible, the human system of self-defense becomes overwhelmed and disorganized.’
Ogden draws on Herman to argue that forced freezing or submission disorganizes the entire defensive system, producing the persistent altered defensive responses characteristic of post-traumatic pathology.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
Rivers (1920) stressed the survival value of freezing; and the concomitant reduction of… several authors have observed a striking analogy between certain animal defensive responses and aspects of trauma-induced psychopathology in humans.
Nijenhuis traces the intellectual lineage of the freeze-as-trauma-analogue from Rivers onward, situating freezing within a broader theoretical framework linking animal defensive response-sets to human dissociative and somatoform pathology.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
the physical tension associated with freezing was quite painful… just thinking about her past trauma brought up the freezing. Jennifer’s therapist continued to help her explore these sensations of freezing.
Ogden presents a clinical case demonstrating how somatic awareness of frozen tension can be therapeutically mobilized into empowering action sequences, converting the arrested defensive response into a resource.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
a freeze state of sympathetic activation—tightened muscles temporarily paralyzing the individual from taking mental or physical action—or it may be filled with neural activation of one aspect of the vagus nerve—the dorsal, unmyelinated branch.
Siegel integrates the two variants of the freeze response into his window-of-tolerance model, correlating sympathetic freeze with muscular rigidity and dorsal-vagal activation with collapse and feigned death.
, The Developing Mind: How Relationships and the Brain Interact to Shape Who We Are, 2020supporting
The individual is forced to abandon active, mobilizing defenses (fight or flight) in favor of defenses that are immobilizing: freeze or ‘feigned death.’ Levine noted that ‘the bodies of traumatized people portray snapshots of their unsuccessful attempts to defend themselves.’
Ogden argues that traumatic freezing represents a compelled abandonment of mobilizing defenses, with the body retaining the sensorimotor imprint of failed protective action.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
the essential process underlying the instinct of immobility is the suppression of fear and pain. It is possible that the instinctive reaction to danger by means of immobility may have furnished one of the earliest motives for suppression.
Nijenhuis cites the hypothesis that immobility’s core function is the suppression of fear and pain, positioning the freeze response as a phylogenetically ancient precursor to psychological suppression and dissociation.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
behavior, and inhibition of the production of sounds (e.g., cries for help)… If these responses do not eliminate contact, immobility may return, reducing the likelihood of continued attack.
Nijenhuis describes how immobility is reinstated within the predatory imminence sequence after explosive escape and aggression fail, characterizing it as a last-resort defense that suppresses vocalisation and reduces attack stimulus.
, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
When hyperarousal accompanied by immobilization has been the response to the trauma, we often see arousal return to baseline through discharge and dissipation made possible by physical activity.
Ogden describes recuperation from sympathetic freeze as requiring physical discharge to return arousal to baseline, implying that therapeutic movement practices are essential to completing the interrupted freeze cycle.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
these defensive responses consist of a series of relatively fixed sequential sensorimotor reactions whose expression depends on the nature of the stimulus, the capacities and experience of the individual, and the external environment.
Ogden contextualises defensive responses, including freezing, within a broader sensorimotor taxonomy of fixed-action tendencies modulated by stimulus, individual history, and environment.
, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006aside
the animal ways are still in our brains and are called upon whenever we encounter a barking dog, are challenged by an aggressive colleague or stranger, or face any kind of situation that has the potential to cause us physical or psychological harm.
LeDoux situates archaic defensive response programs, including freezing, as evolutionarily conserved neural systems that remain operative in contemporary human threat encounters.
, Anxious: Using the Brain to Understand and Treat Fear and Anxiety, 2015aside