What is the definition of mind wandering? How to measure it?

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Lovely and my heartfelt thanks.

Mind wandering is defined as a state where an individual's attention drifts away from the current task, engaging in spontaneous, task-unrelated thoughts and imagery. It often occurs when the mind is not focused on external stimuli, leading to a stream of internal thoughts that can include daydreaming or reflective thinking.

To measure mind wandering, researchers commonly use methods such as thought sampling, where participants report their thoughts at random intervals during tasks, and the Sustained Attention to Response Task (SART), which includes probes to assess whether participants are focused or mind-wandering. Experience sampling methods (ESM) are also employed to gather real-time data on mind wandering in daily life situations.