Card 21 / 54: Green and Bavelier experimented with using video game training to increase the number of objects that could be tracked simultaneously. Subjects measured their baseline tracking capacity, then trained with one of: the block- stacking game "Tetris", an action game, or a non-gaming control condition. What best describes the effect on tracking capacity after training?
A) Only subjects who trained on the action game showed improvements in tracking capacity.
B) Subjects who trained either Tetris or the action game showed improvements, but the control group did not.
C) All subjects showed improvements from the pre-test to the post-test.
D) No statistically significant trends were seen among any of the three groups.

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