Stimulation is EVERYTHING! 📡💪
👁️ Hubel & Wiesel's Classic Experiments (1963)
- Closed one eye in newborn kitten 🐱👁️✂️
- Result: Monocular response only! 👁️❌
- Visual system intact, but can't process! ✅⚠️
🕶️ Dark Room Kittens
- Kept in darkness from birth 🌑
- Visual pathways atrophy! 👁️💀
- Visual cortex degenerates! 🧠⬇️
- PERMANENT BLINDNESS! 🙈❌
🎨 Enriched Environment Studies
🐀 Rosenzweig's Rats (1969, 1972)
Rats raised with toys, swings, ladders! 🧸🎠🪜
Results:
- ⬆️ Increased brain weight! 🧠⚖️
- ⬆️ Thicker cortical tissue! 📏
- ⬆️ Larger neurons! 🧫
- ⬆️ More glial cells! 🔬
- ⬆️ More dendritic spines! 🌿
- 🧪 Different brain chemistry! ⚗️
🌿 Greenough's Findings (1975)
- Increased dendritic sprouting! 🌱📈
- Responded better to novelty! 🌍✨
- Like mildly stressed rats (good stress)! 😰✅
⏰ Critical Periods Matter!
- Timing is EVERYTHING! ⏰✅
- Stimulation needed at RIGHT time! 📡🎯
- Too early = No effect! ⏪❌
- Too late = No repair possible! ⏩❌
- Window of opportunity! 🪟✨
💨 Oxygen: Can't Live Without It!
- Critical during growth! 🌱💨
- Mother's oxygen = Baby's oxygen! 🤰💨
- Hypoxia = Brain damage! 💨⚠️
- Anemia/heart problems in mother = Problems! 🩸💔⚠️
- Neurons die without oxygen! 💀
💪 Motor Activity in Uterus
- Movement = Stronger muscles! 🤰🏃💪
- Exercises connections! 🔗
- Sensory responses too! 👂👁️
- Fetus responds to lullabies! 🎵👶
- Stimulated fetuses more alert at birth! 👀🍼
💊 Teratogenic Effects
- Thalidomide: 1960s sedative = Major deformities! 😴💊🦾⚠️
- Avoid: Morphine 💉, Heroin 💉, Alcohol 🍷, Nicotine 🚬, Cocaine 💊, Tobacco 🚬
- Placental barrier not enough! 🛡️❌
- 1st three months MOST critical! 📅⚠️
📡 Sensory Deprivation = Disaster!
- No stimulation = No development! 📡❌💪
- Organs/muscles need input! 🔌
- Irreversible defects! ❌💔
- Now babies get mobiles & colorful toys! 🎨🧸
🔑 Key Takeaways
- Stimulation = Growth! 📡📈
- Deprivation = Degeneration! ⬇️💀
- Enriched environment = Bigger brain! 🎨🧠⬆️
- Critical periods are windows! ⏰🪟
- Can't repair after window closes! ❌
- Oxygen is non-negotiable! 💨✅
- Drugs destroy developing brains! 💊☠️
- Environment extremely important! 🌍⚡