06 November 2026
A new study shows that the sudden Eureka! moments we associate with brilliant insights may bias our judgement of idea quality—especially in open-ended, creative tasks. Researchers have coined this cognitive quirk the "Aha! glow."
In a paper published last month in the Journal of Intelligence, psychologist Jacqueline McGuinness and colleagues studied how dramatic Aha! insights influence our judgement of idea quality. And the answer is: often poorly, especially during divergent, creative thinking.
What is an Aha! moment, anyway? It's that sudden sense of clarity and excitement that hits when a once-frustrating puzzle piece snaps into place. Brain scans show measurable rushes of reward and bursts of neural activity preceding these light-bulb moments, which feel physically and cognitively rewarding.
Yet previous evidence suggested Aha! insights reliably point to correct solutions, at least in structured problem-solving tasks. A 2020 review noted that there is indeed a link between Aha! moments and correctness, but cautioned that the strength and frequency of these experiences varies between individuals, and can even be manipulated.
Study 1: Writers, Physicists and Fading Brilliance
The first study examined creativity judgments in two groups of professionals whose work could be dialed on an axis from convergence to divergence: physicists for the former, and writers for the latter. Both groups kept diaries, logging their ideas daily and noting when Aha! moments punctuated the process. Six months later, they re-rated the creativity of each idea.
Physicist Aha! ideas were rated more creatively by the individual and others after time passed, whereas writers' Aha! ideas lost their initial luster. This matched the team’s hypothesis that in divergent, generative domains, Aha! moments inflate perceived creativity more than is warranted by true merit.
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Study 2: Lab Tests of Idea Quality and Insight
The team then gathered 286 laboratory participants and asked them to generate ideas using an Alternate Uses Task, in which the aim is to come up with imaginative and unusual uses for everyday objects. The subjects rated the intensity of their Aha! moments and their own creativity, while external assessors gave a more objective judgment of the idea quality.
The results? Stronger Aha! feelings were linked to higher self-rated creativity scores, but only corresponded to slightly elevated external creativity ratings of the same ideas. The external assessors were blunt: participants tended to overplay the inherent, actual creativity of an idea solely based on the intensity of their Aha! experience, with little correlation to how innovative the idea really was. This penchant for crediting Aha! moments with disproportionate creativity is, the researchers say, evidence of an "Aha! glow."
Across both studies, the team concluded that Aha! intensity was a much better predictor of both self-assessed and objective creativity in convergent tasks than it was in divergent tasks, where it led to pervasive but false confidence.
These findings should temper some Aha! moments' outsized status, and make creators a little cautious of flaring inspiration that wouldn't age well.