Misattribution

The Full Picture

Dutton and Aron's 1974 Capilano suspension bridge experiment revealed this cognitive bias in its purest form: men crossing a swaying 70-metre footbridge rated a female interviewer as more attractive than men who met her on solid ground. Their bodies couldn't distinguish fear-arousal from sexual arousal—the racing pulse meant 'danger' but the brain labelled it 'desire.' Schacter catalogued misattribution as one of memory's seven sins, the cost of a constructive memory system optimised for flexibility and future simulation rather than faithful source recording. Biology runs on the same trade-off. In rheumatic fever, Streptococcus bacteria carry surface proteins (M-proteins) that resemble cardiac tissue antigens. The immune system correctly identifies the pathogen but then attacks heart valves because it cannot distinguish bacterial coat from host tissue—a molecular misattribution that can cause more deaths than the original infection in populations without access to antibiotics. The immune system chose breadth of detection over precision of targeting, and the result is friendly fire. Signal transduction networks face identical ambiguity at the cellular level. Cyclic AMP serves as a second messenger for adrenaline, glucagon, and multiple other hormones simultaneously. When adrenaline floods the system during a near-miss car accident, the same cAMP cascade that mobilises glucose also triggers emotional memory consolidation. The cell cannot attribute the cAMP signal to a single upstream cause—it responds to concentration, not identity. This is why emotionally charged events produce vivid but factually unreliable memories: the arousal signal amplifies encoding while corrupting source information. Deer demonstrate the survival logic of accepting misattribution over demanding precision. A white-tailed deer that hears a branch snap will bolt regardless of whether the sound came from a mountain lion, a falling limb, or a passing hiker. The cost of misattributing a harmless sound to a predator is a few hundred calories of unnecessary flight. The cost of correctly attributing a predator sound to wind is death. Natural selection built alarm systems that over-attribute because false positives are cheap and false negatives are fatal. The illusory truth effect exploits this same architecture. Processing fluency—the subjective ease of comprehension—gets misattributed to truth value. A claim you've processed before moves through neural circuits faster the second time, and your brain reads that speed as familiarity, which it reads as accuracy. Propaganda, advertising, and political messaging all exploit a system that confuses 'I've heard this before' with 'this is correct.'