Grammar Entry 563 / 1011 60-second read

Stimulus vs. Stimuli

Singular versus plural.

The comparisoni

✗ Wrong

The researchers presented three stimulus.

✓ Correct

The researchers presented three stimuli.

The ruleii

STIMULUS (sg). STIMULI (pl).

STIMULUS is singular. STIMULI is plural — Latin plural, like CACTUS/CACTI.

Memory aidiii

Remember it like this

One -US, many -I."

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