Why people fall for misinformation - Joseph Isaac

TED-Ed

Original Research by David Hanig (1901)

Published dissertation at Leipzig University analyzing taste sensitivities across tongue
Used 4 basic flavor stimuli:
- Sucrose for sweet
- Quinine sulfate for bitter
- Hydrochloric acid for sour
- Salt for salty
Found maximum sensations varied by tongue location:
- Sweet: tongue tip
- Bitter: tongue back
- Salt: specific tongue area
- Sour: middle of tongue sides
Key finding: Every sensation could be tasted across entire tongue with only very small variations in intensity

Hanig's research led to modern "taste map" dividing tongue into 4 separate areas
Map shows: tip captures sweetness, base detects bitterness, sides capture salty/sour
Map published in textbooks and newspapers despite being incorrect
Not accurate representation of Hanig's original discoveries

Language barrier: Hanig's dissertation written in German, limiting readership to German-fluent academics
Telephone game effect: Research reshaped each time shared with outside parties
Media distortion: Less than decade after dissertation, newspapers falsely claimed experiments proved sweetness imperceptible on tongue back

1912: Rough map version appeared in newspaper article about taste/smell research mysteries
Article featured clear labels across tongue, simplified Hanig's complicated original diagrams
Approachable image repeatedly cited without credit or nuanced consideration
Image spread to textbooks and classrooms as purported truth

Map complements desire for clear stories about world
Science fields sometimes messy, lacking simple narratives
Taste complexity example: number of tastes more complicated than Hanig suggested
- Umami (savory) now considered 5th basic taste
- Debate continues over fatty, alkaline, metallic, water-like tastes
Good stories difficult to change even with new evidence