Alex learns how to play a new video game, Virtual Chess. Alex plays for a few hours before going to bed. That night, Alex dreams about playing chess. The next day, Alex shows much improvement when playing the video game compared to others who did not benefit from a period of REM sleep between playing sessions. Alex's improvement supports which of the following? O latent content of dreams presence of delta waves during dreams O information-processing theory of dreams O manifest content of dreams O activation-synthesis theory of dreams