Which description is correct about Song Ming's test of guessing the hidden hand of coins? ()

But the guess of 1 is that when the answer is no, there is a full smile and hesitation from micro-expression recognition. Micro-expression recognition is a psychological skill to analyze people's inner psychological cognition, emotional attitude and will behavior through micro-expression clues such as face, body and voice, which is used for event verification, criminal investigation and improvement of emotional intelligence. The course focuses on knowledge learning, application case observation and practical training.