How does your brain perceive the world?

March 20, 2026·50 min·4 clips

Jennifer Thompson was certain she had identified her rapist — DNA proved her wrong eleven years later.

The mind stays partly hidden. Manoush Zomorodi opens with a simple problem: every person moves through the world with a slightly different version of reality, and nobody can fully climb inside another mind to compare notes. From there, the episode turns to memory, where confidence can grow even as the original evidence gets muddier. Ronald Cotton is the case that gives the conversation its weight. One eyewitness test led to a low-confidence identification. Another witness first rejected every face in a photo lineup that included him. Then time got involved, and the evidence changed. John argues that this is not only a story about eyewitness testimony going wrong. It is a story about memory after first contact, when later information can work its way in and make the memory feel cleaner than it is. His comparison is blunt: memories are less like video recordings and more like crime scene evidence handled without gloves. Every later touch can leave a mark. That is where the episode gets practical. Police already understand that DNA or fingerprints need to be collected before contamination spreads. John wants early memory evidence treated with the same care, especially when someone is unsure or clearly rejects a suspect at first. Manoush pauses on the obvious question: if that early evidence matters so much, why does law enforcement give it less weight? John says police often do not grasp how easily episodic memory changes over time. The science lands because it stays close to real life. The unsettling part is not that people lie. It is that a person can sincerely remember something that has already been altered.

As heard by us

A clear, grounded episode on perception, contaminated memory, and why early eyewitness accounts deserve more care than confident later ones.

TED Radio Hour treats perception as more private and changeable than everyday confidence allows. Manoush Zomorodi opens with Alex Rosenthal's visualization exercise and the unsettling idea that other minds are partly closed to us, then moves into memory as a system that can…

Read the full review in PlayNext →

Why you'd press play

If you swapped consciousnesses with someone, you would both be lost at first. This episode turns that strange thought into a tour of how differently minds perceive the world.

Read the full recommendation in PlayNext →

Listen to the show on

Apple Podcasts Spotify

Play clips from this episode More from TED Radio Hour