The Tetris effect occurs when people devote sufficient time and attention to an activity that it begins to overshadow their thoughts, mental images, and dreams
Stickgold et al. (2000) have proposed that Tetris imagery is a separate form of memory, likely related to procedural memory. This is from their research in which they showed that people with anterograde amnesia, unable to form new declarative memories, reported dreaming of falling shapes after playing Tetris during the day, despite not being able to remember playing the game at all.[3]
A recent Oxford study (2009) suggests Tetris-like video games may help
prevent the development of traumatic memories. If the video game
treatment is played soon after the traumatic event, the preoccupation
with Tetris shapes is enough to prevent the mental recitation of
traumatic images, thereby decreasing the accuracy, intensity, and
frequency of traumatic reminders. "We suggest it specifically interferes
with the way sensory memories are laid down in the period after trauma
and thus reduces the number of flashbacks that are experienced
afterwards," summarizes Dr. Emily Holmes, who led the study.[4][5]
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