• Sony’s 2005 patent US 6,536,440 describes a method for “beaming” sensory data—smells, sounds, or images—into the brain via focused ultrasonic pulses, claiming ~5× better spatial resolution than TMS.  
• Channel members debated the DIY viability of low-intensity transcranial ultrasound stimulation: a single-transducer driver can be built for ~US $100, but multi-element focusing arrays for skull penetration may need 10–20 drivers and must operate at far lower power than tumor-ablation systems.  
• Safety protocols were discussed, including a study that validated apparatus by inducing controlled lesions in grocery-store meat and imaging the ablations; mis-set power levels risk tissue damage.  
• Practical test targets were proposed: the visual cortex for early experiments, and reversible “on/off” of auditory processing or motor intentions as transhumanist proofs-of-concept.  
• An open archive of ultrasound-neuro papers (http://diyhpl.us/~bryan/papers2/neuro/ultrasound/) and Tyler Lab’s work (http://www.tylerlab.com/home) were shared as primary resources for home experimenters.  
• Participants contrasted transcranial ultrasound with tDCS, arguing that ultrasound’s superior spatial resolution and safety at neuronal-stimulation energies justify wider DIY adoption despite the current scarcity of rigs.  
• A 2013 University of Rochester study was highlighted showing that the brain’s glymphatic system drives a cerebrospinal-fluid “power-wash” during sleep, flushing metabolic toxins and explaining sleep’s neuro-protective role.  
• Two pay-walled papers (10.1007/BF02797469 and 10.1007/BF01870816) were retrieved via paperbot and mirrored at diyhpl.us.  
• The group asked whether an open, step-by-step chemical-synthesis protocol database exists; consensus was that most current resources are pay-sites or fragmented journal links.