Overview

A 2025 meta-analysis of 10,116 children found excessive screen time associated with poorer development (OR 1.24). Yet one month of coding produced Cohen's d of 1.62 for executive function—equivalent to seven months of standard activities. The paradox isn't an error. It's the point. The question isn't whether screens are good or bad, but when, how, and for whom specific technologies produce specific outcomes under specific conditions. Read the full research report at https://research.yuda.me/podcast/episodes/building-a-micro-school/ep4-technology-infrastructure/report.md Key Sources: • 2025 Meta-Analysis - Screen Time Effects: OR 1.24 for social-emotional issues across 10,116 children • Arfé et al. 2019 Coding RCT: d=1.62 for executive function in one month (76 first graders) • Cambridge 2026 Longitudinal Study: Screen time before age 2 altered brain development, neutralized by parent-child reading • DOJ WCAG Rule (April 2024): Compliance deadlines April 2026/2027 for accessibility standards • GPT-Researcher Industry Analysis: ChromeOS 60.1% K-12 market share, 10-year update policy

Key Timestamps

• 0:00 - Introduction: The Technology Paradox
• 1:12 - Understanding Screen Time: The Salt Analogy
• 2:34 - Active vs. Passive Screen Time
• 4:06 - The Video Deficit Effect
• 5:46 - Social Contingency: Why Live Interaction Matters
• 7:28 - The Displacement Hypothesis
• 9:51 - What Works: Coding and Executive Function
• 12:02 - Math Apps and Blended Learning
• 14:10 - What Doesn't Work: AI Tutoring Hype
• 16:42 - The Adult Mediation Multiplier
• 18:40 - Minimum Viable Tech Stack
• 21:00 - Age-Specific Screen Time Guidelines
• 22:42 - Compliance: COPPA and WCAG Requirements
• 24:50 - Content Selection: The Four Pillars Framework
• 26:22 - Key Takeaways and Closing

Sources

Sources for Building a Micro School: Ep. 4, Technology as Infrastructure

Research Tools Used

• Perplexity (Academic & Official - automated)
• Grok (Real-Time & Regional - manual)
• GPT-Researcher (Industry & Technical - OpenAI GPT-5.2 - automated)
• Gemini Deep Research (Strategic & Policy - automated)

Verified Sources by Tier

Tier 1: Meta-analyses, Systematic Reviews, Official Statistics

Tier 2: RCTs, Large Studies, Government Reports

Tier 3: Case Studies, Industry Reports, News

Notes

• Research compiled: 2026-01-21
• Sources cross-validated across multiple tools
• Conflicting sources noted in research/p3-briefing.md