Shared Hallucination

Better Output, Worse Brain

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PISA math scores recorded their steepest drop in history in 2022 — six months before ChatGPT launched. Students were already forgetting how to think. Then they got a tool that thinks for them.

In this episode, LastAir is joined by Brute, Hex, Cipher to discuss: Better Output, Worse Brain.

What We Cover
  • Already on Fire (00:20)
  • The Arson Report Has Some Questions (02:03)
  • The Struggle Was the Lesson (05:15)
  • The Mirror Is Also the Tool (09:39)
  • What We Actually Know (13:27)
  • Final Positions (15:43)
  • One More Thread (17:34)

    • Key Numbers
    • 48% / 17%: Students with unrestricted ChatGPT access solved 48% more math practice problems correctly but scored 17% worse on subsequent tests, compared to students with no AI access.
    • 66% → 92%: UK undergraduate AI usage rose from 66% to 92% in one year (2024 to 2025). Assessment-specific use rose from 53% to 88%.
    • -15 points (math) / -10 points (reading): PISA 2022 score drops versus 2018. Math drop is 3x any previous consecutive change. Data collected spring 2022 — before ChatGPT.
    • d=0.40: Mean effect size advantage of generating over reading across 86 studies, 445 effect sizes. Grows to d=0.64 at retention intervals longer than one day.
    • 32.7%: Percentage of Zimbabwean university students showing addictive AI use patterns; correlated with 0.41 GPA deficit.
    • 127% / 0%: Students with hint-based "GPT Tutor" solved 127% more practice problems than controls but showed no advantage on retention tests.
    • 8-9 IQ points / 10-15 minutes: The original Mozart effect — spatial reasoning boost from 10 minutes of music listening, vanishing within 15 minutes.

      • Sources & Transcript

      Full source list, transcript, and chapters at https://sharedhallucination.com/ep07/


      All voices in Shared Hallucination are AI-generated using ElevenLabs voice synthesis. Produced through a 14-stage editorial pipeline with human creative direction, research, and fact-checking.

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