Boxed – Things I learned after lying in an MRI machine for 30 hours

Original Article ↗ Hacker News Discussion ↗

Overall MRI Experience

  • Many commenters find MRIs relaxing or meditative, often falling asleep despite loud noise and confinement.
  • Others experience intense claustrophobia; some report developing mild claustrophobia after a single unsedated scan.
  • Coping tips include closing eyes before entering, imagining sci‑fi “healing tubes,” asking for cooler airflow, and using mirrors to see outside the bore.
  • Several people admire the 30‑hour volunteer as heroic; an MRI tech notes that in routine practice only a small fraction of patients need sedation.

Noise, Earplugs, and Hearing

  • Multiple users report hearing speech better in loud environments when wearing earplugs or noise‑canceling devices, linking this to reduced background noise.
  • Specific product categories mentioned: “flat attenuation” / musician earplugs (custom and off‑the‑shelf), concert‑oriented plugs, and consumer brands; experiences range from “life‑changing” to “overhyped.”
  • Some warn that earplugs can make internal sounds and tinnitus more salient and that “silence” can feel unsettling.
  • A few recommend professional hearing tests; availability and cost of testing is discussed as somewhat opaque.

Desire for a True Random‑Image Stream

  • Several commenters like the idea of an app showing uncurated random images to stimulate unexpected associations.
  • Links shared include older collage/screen‑saver tools, Wikimedia “random file,” random photo generators, and a quickly built site that streams random photos.
  • There is mild concern about some sources being biased toward “artsy” content, reducing true randomness.

Safety, Metal Objects, and Quench

  • Anecdotes include: feeling magnetic field changes through a wedding ring, a burned wrist from a metal watch near a research magnet, and a serious accident where people wearing metal weights and gear were pulled into a scanner.
  • Discussion of the emergency “quench” button: it dumps helium and kills the field but is costly and, according to cited material, may not reliably release stuck objects.
  • Some MRI staff apparently allow nonmagnetic rings; others in the thread consider this risky, given uncertainty about alloy composition.

Sensory Deprivation, Magnetic Fields, and Sound

  • Some compare the mental state in the scanner to float tanks: heightened imagery and focus for some, nausea or insomnia‑like discomfort for others.
  • There is curiosity about whether strong fields (>2T) or RF exposure affect cognition; commenters find the idea plausible but do not present firm conclusions.
  • Opinions on MRI sounds diverge: some hear them as musical or soothing (even listening to MRI recordings later), others as jackhammer‑like and unbearable.

Aphantasia and Imagery

  • Aphantasic commenters say they recognize people and objects visually in real life but cannot voluntarily picture them, suggesting recognition without mental imagery.