In an experiment, students were given Ted Talks to watch and were told to take notes, half with laptops, the other with pen and paper.
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Recording lectures to replay later has shown to have no added benefits compared to paying attention the first time without the possibility of watching it again.
Students who take notes during a lecture or presentation achieve more than those who just passively listen.
Note-taking makes one's attention focused on the ideas being discussed, and also leads to a review of the lesson being taught. It is a good idea to take complete and detailed notes, as one study shows that the more note the students take, the higher is their achievement. Omitting details or examples is common among students, but is not advisable.
Using a laptop is not an ideal way to take notes or to learn, during a lecture.