Formal Conceptual Diagrams

A Developmental–Evolutionary Model of Depression
Figure 1. Developmental Transformation of Depression
Figure 2. Neurodevelopmental Layer Model of Depression
Figure 3. Conceptual Map: Depression vs Autism, Attachment Disorder, and Trauma
Figure 4. Temporal Dynamics of Depression Across Development
Figure 5. Evolutionary Shift: From Adaptive Inhibition to Pathology
Figure 6. Diagnostic Consequences (Critical View)
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A Developmental–Evolutionary Model of Depression

(Contrasted with Autism, Attachment Disorder, and Trauma)

Figure 1. Developmental Transformation of Depression

(Vertical axis: development; horizontal axis: form of suffering)

┌──────────────────────────────────────────────┐
│                  ADULTHOOD                   │
│                                              │
│  Narrative self                              │
│  Rumination / meaning-based suffering        │
│  Chronic, self-sustaining depression         │
│                                              │
├──────────────────────────────────────────────┤
│                ADOLESCENCE                   │
│                                              │
│  Emerging self-identity                      │
│  Affective instability                      │
│  Episodic, recurrent depression              │
│                                              │
├──────────────────────────────────────────────┤
│                 CHILDHOOD                    │
│                                              │
│  Bodily affect and somatic expression        │
│  Rapid recovery (sleep, plasticity)          │
│  Non-narrativized distress                   │
│                                              │
└──────────────────────────────────────────────┘
            ↑
            │ Developmental maturation
            │ (neural integration)

Caption

Depression is not a unitary disorder across development. It evolves from transient bodily affect in childhood into identity- and meaning-based suffering in adulthood.

Figure 2. Neurodevelopmental Layer Model of Depression

[ Late-evolving systems ]
────────────────────────────────────────
Default Mode Network (DMN)
Medial prefrontal cortex
Self-referential rumination
↓
Dominant in adult depression

[ Intermediate systems ]
────────────────────────────────────────
Social pain and rejection sensitivity
Reward system dysregulation
↓
Prominent in adolescence

[ Evolutionarily ancient systems ]
────────────────────────────────────────
Stress response (HPA axis)
Amygdala reactivity
↓
Present across all ages

Interpretation

Children primarily express depression through lower, ancient systems
Adult depression reflects pathological dominance of late-evolving self-referential circuits

Figure 3. Conceptual Map: Depression vs Autism, Attachment Disorder, and Trauma

                     Time / Narrative Axis
                            ▲
                            │
          Trauma              │          Depression
 (Intrusive past threat)     │   (Collapsed future meaning)
                            │
────────────────────────────┼────────────────────────────▶
                            │
                            │
     Attachment Disorder     │           Autism
 (Relational safety failure)│  (Neurodevelopmental divergence)
                            │
                            ▼
                     Social / Meaning Axis

Definitions for figure legend

Depression: Failure of future-oriented meaning within a developed self
Trauma: Persistent intrusion of unintegrated past threat into the present
Attachment disorder: Maladaptation of safety regulation within relationships
Autism: Neurodevelopmental divergence in social world-model construction

Figure 4. Temporal Dynamics of Depression Across Development

Childhood:
Affective state ──▶ Rapid reset (sleep / plasticity)

Adolescence:
Affective state ──▶ Pattern ──▶ Partial reset

Adulthood:
Pattern ──▶ Narrative identity ──▶ Self-sustaining loop

Clinical implication

What changes with age is not the presence of depressive affect, but its temporal persistence and integration into the self.

Figure 5. Evolutionary Shift: From Adaptive Inhibition to Pathology

Short-term behavioral inhibition
(Energy conservation, withdrawal, signaling)
            │   ← adaptive
            │
            ▼
Chronic self-referential inhibition
(Rumination, hopelessness, loss of meaning)
            │   ← maladaptive

Evolutionary thesis

Depression becomes pathological when an evolutionarily adaptive inhibitory system is hijacked by a highly developed self-model.

Figure 6. Diagnostic Consequences (Critical View)

Symptom-based classification
        │
        ▼
Developmentally insensitive diagnosis
        │
        ▼
Misclassification
(childhood: underdiagnosis,
 autism/trauma: misdiagnosis)

One-Sentence Integrative Statement (for Abstract or Conclusion)

Depression is not fundamentally a childhood disorder, but a developmental transformation of affect into narrative suffering, enabled by the maturation of self, time, and meaning.

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