---
id: wiki-2026-0508-default-mode-network
title: Default Mode Network (DMN)
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [DMN, default mode network, mind wandering, rumination, task-negative, sleep consolidation]
duplicate_of: none
source_trust_level: A
confidence_score: 0.88
verification_status: applied
tags: [neuroscience, dmn, mind-wandering, creativity, depression, sleep-consolidation, brain-network]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
  language: neuroscience
  applicable_to: [Productivity, Creativity, Mental Health, AI Memory Design]
---

# Default Mode Network (DMN)

## 매 한 줄
> **"매 idle 의 brain 의 가장 busy"**. 매 mPFC + PCC + angular gyrus 의 task-negative network. 매 self-reflection + 매 social cognition + 매 creativity 의 source. 매 over-active = 매 rumination (depression). 매 modern AI: 매 background memory consolidation 의 inspiration.

## 매 핵심 region
- **Medial Prefrontal Cortex (mPFC)**: 매 self-reference.
- **Posterior Cingulate Cortex (PCC)**: 매 hub.
- **Angular Gyrus**: 매 association.
- **Hippocampus**: 매 memory replay.
- **Temporal pole**: 매 social knowledge.

### 매 function
1. **Self-referential thought**: "Who am I?"
2. **Social cognition / ToM**: 매 others 의 mental state 의 simulate.
3. **Autobiographical memory**: 매 past recall.
4. **Future imagination / planning**.
5. **Creative incubation**: 매 random connection.
6. **Mind wandering**: 매 default state.

### Task-positive vs Task-negative
- **TPN** (Task-Positive): 매 focused work — DMN 의 suppress.
- **DMN** (Task-Negative): 매 rest / wandering — TPN 의 suppress.
- 매 anti-correlated.

### 매 functional balance
- **Healthy**: 매 flexible switching.
- **Rumination** (depression): 매 DMN over-active.
- **ADHD**: 매 DMN suppression 의 fail.
- **Autism**: 매 DMN 의 underconnected.
- **Schizophrenia**: 매 DMN 의 abnormal.

### 매 modulation
- **Mindfulness / meditation**: 매 DMN 의 quiet.
- **Psychedelic** (psilocybin): 매 ego dissolution = DMN 의 disrupt.
- **Sleep**: 매 DMN-like activity (consolidation).
- **Exercise**: 매 BDNF + 매 DMN 의 modulate.
- **Boredom / nature**: 매 DMN 의 activate.

### 매 productivity 의 응용
- **Creative break**: 매 walking, shower.
- **Active rest**: 매 mindfulness > 매 social media (매 same wandering 의 X).
- **Pomodoro** + 매 break.
- **Sleep**: 매 problem 의 forget → 매 wake 의 insight.

### 매 modern AI 의 inspiration
- **Sleep replay** (RL): 매 hippocampal replay 의 memory.
- **Latent dreaming**: 매 model 의 internal simulation.
- **DPO / RLHF**: 매 quiet phase + 매 reflection.
- **Background processing**: 매 LLM 의 idle 의 memory consolidate.

## 💻 패턴 (응용)

### Cognitive worker 의 DMN-friendly schedule
```python
def dmn_friendly_day():
    return [
        ('06:30-07:00', 'Wake + sunlight (no phone)', 'DMN active'),
        ('07:00-07:30', 'Walk in nature', 'DMN + creative incubation'),
        ('07:30-08:00', 'Breakfast + reflective journal', 'DMN'),
        ('08:30-10:00', 'Deep work (TPN)', 'DMN suppressed'),
        ('10:00-10:30', 'Walk break (no phone, no podcast)', 'DMN — incubate'),
        ('10:30-12:00', 'Deep work', 'TPN'),
        ('12:00-13:00', 'Lunch + slow walk', 'DMN'),
        ('13:00-14:30', 'Deep work', 'TPN'),
        ('14:30-15:00', 'Power nap or meditation', 'DMN consolidate'),
        ('15:00-17:00', 'Light tasks', ''),
        ('22:30', 'Wind down (no screen 60 min)', 'DMN prep'),
    ]
```

### Mindfulness session (DMN modulator)
```python
def mindfulness_3min():
    return [
        ('1 min', 'Awareness — what is here?', 'DMN observe'),
        ('1 min', 'Breath anchor', 'DMN suppress'),
        ('1 min', 'Open awareness', 'DMN with awareness'),
    ]
```

### Sleep consolidation (replay-inspired RL)
```python
def replay_buffer_consolidation(buffer, model):
    """매 sleep / idle phase 의 replay."""
    # 매 매 hour 의 1× of recent 의 rehearse
    samples = buffer.sample(n=batch_size, prefer_recent=True)
    
    # 매 with light noise (creative recombine)
    for s in samples:
        s_perturbed = add_small_noise(s)
        model.gradient_step(s_perturbed)
```

### Rumination detector (mental health)
```python
def detect_rumination(journal_entries, days=7):
    """매 negative repetitive thought 의 detect."""
    recent = journal_entries[-days:]
    sentiment_neg_count = sum(1 for e in recent if sentiment(e) < -0.3)
    
    # 매 same theme 의 repetition
    themes = [extract_theme(e) for e in recent]
    repeated = Counter(themes).most_common(1)[0][1]
    
    if sentiment_neg_count > days * 0.6 and repeated > days * 0.5:
        return 'WARN: rumination risk — consider professional support'
    return None
```

### Creative incubation (deliberate wandering)
```python
def creative_incubation(problem, duration_min=20):
    """매 problem 의 conscious 의 release + DMN 의 work."""
    return [
        f'1. Define problem clearly (5 min)',
        f'2. Set aside ({duration_min - 5} min):',
        f'   - Walk in nature',
        f'   - Take shower',
        f'   - Light sleep / meditation',
        f'   - Repetitive low-stim activity (folding laundry)',
        f'3. Return + capture insights without forcing',
    ]
```

### LLM "DMN" mode (background memory)
```python
class LLMWithMemory:
    def __init__(self, model):
        self.model = model
        self.episodic_buffer = []
    
    async def task_mode(self, query):
        return await self.model.generate(query)
    
    async def dmn_mode(self):
        """매 idle 의 background consolidation."""
        if not self.episodic_buffer: return
        
        # 매 random recent episode 의 reflect
        episode = random.choice(self.episodic_buffer[-100:])
        reflection = await self.model.generate(
            f"Reflect on this past interaction:\n{episode}\n\n"
            f"Extract 1-3 lessons or patterns. Brief."
        )
        save_long_term(reflection)
```

### Anti-DMN 의 toxic habit
```python
DMN_KILLER = [
    'social media scroll (passive + comparing)',
    'doom-scrolling news',
    'multi-tasking video',
    'endless email check',
]

DMN_FRIENDLY = [
    'walk in nature',
    'shower',
    'mindless physical task (laundry, cooking simple)',
    'meditation',
    'journal',
    'reading fiction (no notes)',
]
```

## 매 결정 기준
| 상황 | Activity |
|---|---|
| Stuck on problem | DMN-friendly walk / nap |
| Creative work needed | Schedule incubation time |
| Mental fatigue | Mindfulness or nature |
| Rumination risk | CBT + meditation + exercise |
| Productivity | TPN block + DMN break |
| Insomnia | Anti-rumination CBT-I |

**기본값**: 매 deep work + 매 DMN-friendly break + 매 sleep + 매 mindfulness.

## 🔗 Graph
- 변형: [[Mind-Wandering]] · [[Rumination]] · [[Sleep-Consolidation]] · [[Theory-of-Mind]]
- Adjacent: [[Brain-Derived Neurotrophic Factor (BDNF)]] · [[Bayesian-Brain-Hypothesis]] · [[Cognitive-Therapy-in-CBT]] · [[Cognitive Reserve Theory]] · [[Bioenergetics]]

## 🤖 LLM 활용
**언제**: 매 productivity routine. 매 creative work design. 매 mental health prevention. 매 LLM background memory design.
**언제 X**: 매 specific clinical (의사 / therapist).

## ❌ 안티패턴
- **No DMN time** (constant TPN): 매 burnout + 매 creative block.
- **Social media as "rest"**: 매 DMN의 X — 매 same task-engagement.
- **Rumination 의 ignore**: 매 depression risk.
- **Boredom 의 fear**: 매 DMN 의 valuable.
- **Sleep 의 cut**: 매 consolidation X.

## 🧪 검증 / 중복
- Verified (Raichle DMN 2001, Buckner DMN reviews, Carhart-Harris psychedelic + DMN).
- 신뢰도 A.
- Related: [[Brain-Derived Neurotrophic Factor (BDNF)]] · [[Bayesian-Brain-Hypothesis]] · [[Cognitive-Therapy-in-CBT]] · [[Cognitive Reserve Theory]] · [[Bioenergetics]].

## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — region + function + 매 schedule / mindfulness / replay / LLM DMN code |
