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Ah, the classic confusion between not finding enough evidence to disprove the null hypothesis, and finding enough evidence to prove the null hypothesis.

The caffeinated group outperformed the noncaffeinated on all 5 creativity metrics. The sample size and effect size were too small to prove caffeine caused an improvement.

How did that turn into this title?

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Right. These results could equally well be interpreted as caffeine have the same effect on both convergent and divergent thinking, but divergent thinking (renamed "creativity" in the title) is harder to measure because it has more variance. If anything, it provides mild evidence in favor of the hypothesis that caffeine improves divergent thinking and calls for further study with a larger control group.

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