But according to psychology, the supposed forgetfulness is a sign of high IQ.

This is a common misconception. While forgetfulness can sometimes be associated with high intelligence, it is not a definitive sign of a high IQ. Forgetfulness can be caused by a variety of factors, such as stress, lack of sleep, or simply having a lot on one's mind. Intelligence is a complex trait that cannot be accurately measured by memory alone. It is important to consider a variety of factors when assessing someone's intelligence, rather than relying solely on their ability to remember information.

The claim that supposed forgetfulness is a sign of high IQ is not a well-established finding in psychology. While there may be some anecdotal evidence to support this idea, there is no strong scientific evidence to suggest that forgetfulness is a reliable indicator of intelligence.

In fact, research has shown that memory and intelligence are positively correlated. People with higher IQ scores tend to have better memories than those with lower IQ scores. This is because intelligence is associated with increased brain activity in areas responsible for memory, such as the hippocampus and prefrontal cortex.

While it is possible that some people with high IQs may experience occasional forgetfulness, this is not a typical characteristic of intelligent people. In general, forgetfulness is more likely to be a sign of aging, stress, or other factors that affect memory.