Stroop Effect Explained: How Cognitive Control & Interference Work
Why reading words interferes with naming colors, and what the Stroop task reveals about selective attention and executive control.
The Battle of Cognitive Interference
Try reading the word "BLUE" printed in bright red ink. Your brain instantly reads the letters "BLUE" before you can process the visual color red. This delay in mental processing speed is known as the Stroop Effect, discovered by psychologist J. Ridley Stroop in 1935.
The Stroop task is one of the most widely used benchmarks in cognitive psychology and neuroscience to measure executive function, selective attention, and cognitive flexibility.
| Condition | Task Requirement | Reaction Time | Cognitive Overhead |
|---|---|---|---|
| **Congruent** | Word "RED" in Red ink | ~450 ms | Minimal Interference |
| **Incongruent** | Word "BLUE" in Red ink | ~720 ms | High Interference (Stroop Conflict) |
| **Neutral** | Shape "Block" in Red ink | ~500 ms | Baseline Reaction Time |
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