Advanced Psychology ESL – Neurobiology, Clinical Symptoms & Treatment Models

1. Introduction

Trauma is not defined by the event but by the nervous system’s response to an overwhelming experience.

Trauma can result from:

• acute events (accident, assault)

• chronic stress (abuse, neglect, domestic violence)

• medical trauma

• developmental trauma

Modern trauma psychology focuses on:

• the brain’s response

• the autonomic nervous system (ANS)

• body–mind integration

• long-term effects on cognition, identity, and behaviour

Scientific Expansion: The Core Problem in Trauma

Trauma disrupts neuroception — the brain’s unconscious ability to detect safety or danger.

When neuroception is altered:

• safe situations can feel dangerous

• social cues are misinterpreted

• the body stays in defensive states even when no threat is present

2. The Neurobiology of Trauma

Trauma activates survival circuits in the brain:

A. The Amygdala – alarm system

• detects danger

• becomes hyper-reactive after trauma

• contributes to hypervigilance, anxiety, emotional reactivity

B. The Hippocampus – memory processing

• creates coherent, chronological memories

• trauma can shrink or dysregulate hippocampal functioning

• leads to fragmented memories, flashbacks, dissociation

C. The Prefrontal Cortex (PFC) – executive control

• responsible for reasoning and emotional regulation

• trauma reduces PFC activity

• explains concentration problems, emotional instability, impulsive reactions

Summary:
Trauma = amygdala ↑, hippocampus ↓, PFC ↓.

Scientific Expansion: Neurotransmitters & Stress Chemicals

Trauma alters:

• cortisol → chronic elevation damages hippocampal tissue

• norepinephrine → increases hypervigilance

• dopamine → affects reward learning and fear conditioning

• serotonin → impacts mood, sleep, and emotional stability

These changes make trauma biologically persistent.

3. The Autonomic Nervous System (ANS)

The ANS regulates fight/flight/freeze responses.

Sympathetic System (Fight/Flight)

• heart rate ↑

• adrenaline ↑

• prepares for action

• chronic activation → anxiety, irritability, panic

Parasympathetic System (Rest/Digest)

Two branches:

• Ventral Vagal (safety, connection)

• Dorsal Vagal (shutdown, freeze, collapse)

Trauma often forces the body into defensive patterns.

4. Polyvagal Theory (Stephen Porges)

Polyvagal Theory describes three hierarchical states:

1. Ventral Vagal State – Safety

• calm, grounded

• connected and socially engaged

• strong executive functioning

2. Sympathetic State – Mobilisation

• fight or flight

• fear, anger, panic

• hypervigilance

• racing thoughts

3. Dorsal Vagal State – Immobilisation

• freeze or shutdown

• dissociation

• numbness

• exhaustion

• “I can’t move / think / feel.”

Individuals with trauma often oscillate between sympathetic arousal and dorsal collapse.

Scientific Expansion: The Window of Tolerance

The window of tolerance is the range in which a person can think, feel, and function without being overwhelmed.

Trauma narrows this window → making even small triggers overwhelming.

5. Trauma Responses: Behavioral & Psychological Symptoms

Cognitive

• concentration problems

• fragmented memory

• intrusive thoughts

• looping thoughts

Emotional

• fear, shame

• emotional numbness

• mood swings

Physiological

• insomnia

• chronic pain

• digestive issues

• dizziness, fainting

• autonomic instability

Identity/Relational

• distrust of others

• hyper-independence or fear of abandonment

• feeling “broken,” “different,” or unreal

Scientific Expansion: Why Trauma Produces Physical Symptoms

Trauma dysregulates:

• the ANS

• the HPA axis (stress hormones)

• the immune system

• muscle tension and pain pathways

Leading to:

• chronic pain

• fatigue

• immune dysfunction

• gut problems

• migraines

6. Trauma Types and Their Clinical Impact

A. Acute Trauma

Single overwhelming event → specific triggers

B. Chronic Trauma

Ongoing stress → emotional dysregulation, reduced safety perception

C. Complex Trauma

Childhood trauma → affects identity, attachment, and self-concept
Often overlaps with dissociation and BPD-like symptoms

D. Medical Trauma

Trauma linked to hospitalisation or illness → lasting panic or avoidance

E. PTSD vs CPTSD

PTSD = re-experiencing, avoidance, hyperarousal
CPTSD adds:

• affect dysregulation

• negative self-concept

• relational disturbances

Scientific Expansion: Differential Diagnosis

Trauma can resemble:

• BPD

• bipolar disorder

• ADHD (hyperarousal)

• panic disorder

• GAD

• dissociative disorders

• autoimmune or endocrine disorders

Accurate assessment is crucial.

7. Dissociation

Dissociation is a protective but disruptive trauma response.

Forms include:

• depersonalisation

• derealisation

• identity disruption

• memory gaps

• emotional numbing

• cognitive shutdown

Dissociation is linked to dorsal vagal activation.

Scientific Expansion: Memory & Dissociation

During trauma:

• the hippocampus fails to integrate memory

• the amygdala stores emotional fragments

• the PFC shuts down

This results in:

• flashbacks

• fragmented or missing memories

• “body memories”

8. Trauma & The Body (Somatic Effects)

Trauma affects:

• vagal tone

• breathing

• pain modulation

• immune function

• endocrine balance

• chronic muscle tension

“The body keeps the score” — bodily symptoms persist even when narrative memory fades.

9. Evidence-Based Trauma Treatments

A. Trauma-Focused CBT (TF-CBT)

• cognitive restructuring

• gradual exposure

B. EMDR

• bilateral stimulation

• memory reprocessing

• reduces amygdala activation

C. Somatic Therapies

• Somatic Experiencing

• Sensorimotor Psychotherapy

• bodily regulation, bottom-up processing

D. Polyvagal-Informed Therapy

• grounding

• breathwork

• co-regulation

• strengthening ventral vagal pathways

E. DBT

• improves emotional regulation

• reduces impulsivity

• helps with complex trauma patterns

F. Internal Family Systems (IFS)

• works with “parts”

• reduces internal conflict and trauma fragmentation

G. Pharmacological Support

• SSRIs

• beta-blockers

• sleep stabilisers

Medication supports stability but does not resolve trauma directly.

Scientific Expansion: How Therapy Changes the Brain

• CBT strengthens the PFC → improves emotional regulation

• EMDR weakens amygdala activation → rewrites trauma memory

• Somatic therapies restore ANS balance → widen the window of tolerance

• DBT increases prefrontal control → improves impulse regulation

• IFS integrates dissociated self-states → reduces internal conflict

10. Trauma Vocabulary for Advanced Students

• autonomic dysregulation

• hyperarousal

• hypoarousal

• dissociation

• trigger

• flashback

• emotional numbing

• affect regulation

• somatisation

• vagal tone

• window of tolerance

• reprocessing

• trauma-informed care

11. Discussion Questions

• Why does trauma have such strong effects on the nervous system?

• How does Polyvagal Theory explain hypervigilance and shutdown?

• Why might someone move between fight/flight and freeze states?

• What makes complex trauma different from PTSD?

• Which trauma therapies focus on the body rather than thoughts?

• Why is dissociation considered a protective mechanism?

• How can understanding trauma physiology improve treatment outcomes?

12. Case Study & Clinical Reasoning

Case Study
A 30-year-old woman experiences sudden freezing episodes, emotional numbness, and difficulty recalling parts of her childhood. She becomes overwhelmed by loud voices and collapses into a “shutdown” state during stress. Medical tests are normal. She avoids hospitals after traumatic experiences during illness.

Questions

1. Which trauma symptoms does she show?

2. Which autonomic pathways appear activated?

3. PTSD or CPTSD — which fits better, and why?

4. What differential diagnoses should be ruled out?

5. Which treatments might be effective?

6. How does Polyvagal Theory explain her collapses?