- A participant asked for purchase links for implantable microelectrode arrays (MEAs) suitable for ECoG, specifically seeking open-source, biohacking, or “dark-market” sources.  
- Discussion confirmed MEAs can be either rigid or flexible; flexibility is generally preferred for long-term neural interfaces.  
- Two recent research papers were shared:  
  – “Fossilized hydrogel shrinky-dinks” (Nature 2022) https://www.nature.com/articles/s41586-022-05433-2  
  – ACS Nano Letters follow-up (2023) https://pubs.acs.org/doi/10.1021/acs.nanolett.3c02309  
- These papers describe a method to shrink hydrogel microstructures into ultra-miniaturized, flexible neural electrode arrays, potentially lowering barriers to DIY or open-source neural interface fabrication.