Research suggests that highly intelligent people are better able to judge the intelligence of others.

Intelligence is the ability to learn, reason, and solve problems, and it is also important for smooth social interaction. People have the ability to judge the intelligence of others from short periods of social contact, but new research has shown that highly intelligent people can judge 'the intelligence of others' more accurately.
The good judge of intelligence - ScienceDirect
Intelligent people are better judges of the intelligence of others
https://www.psypost.org/intelligent-people-are-better-judges-of-the-intelligence-of-others/
There are individual differences in the ability to estimate the intelligence of others; some people can accurately perceive the intelligence level of others, while others may not be as adept at it. Therefore, a research team led by Christoph Heine, who studies psychology at Witten-Herdecke University in Germany, hypothesized that 'people with higher intelligence levels can more accurately assess the intelligence level of others,' and investigated individual differences in the ability to judge the intelligence of others based on short videos.
The experiment involved 198 participants, 72% of whom were university students, 140 of whom were female, and the average age was 29. Participants watched 50 one-minute videos featuring a 'subject' whose intelligence level had been measured in advance. In the videos, the subject read aloud a weather forecast, talked about a recent enjoyable experience, explained the meaning of the word 'symmetry,' and performed short role-playing exercises. After watching each video, participants rated the subject's intelligence on a five-point scale.
The research team then measured the subjects' intelligence using the same three tests that were used to measure the intelligence levels of the participants. In addition, subjects were measured on items such as emotional recognition ability, empathy, personality traits, and subjective well-being, and their ability to evaluate the intelligence levels of others was analyzed for each of these items.

The experiment revealed that the ability to judge the intelligence of others varied greatly from person to person, and as hypothesized, individuals with higher intelligence tended to judge the intelligence level of others with greater accuracy. Similarly, subjects with high emotional recognition abilities and those who reported high life satisfaction also tended to judge intelligence levels more accurately.
It is believed that these people were able to accurately judge the intelligence levels of others because they relied on behavioral cues such as how clearly the person spoke, the content of what they said, and their vocabulary.
The research team had anticipated that factors such as gender, empathy,
The research team stated, 'These findings highlight how important the perceiver's cognitive and socio-emotional abilities are in social evaluation, and support the idea that the ability to accurately assess intelligence is related to psychological adaptation.'

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