What Is the Current State of Proper, Scientific Research That

What is the current state of proper, scientific research that examines the effectiveness of "brain training" programs like Lumosity and BrainHQ?

A) The research fails to support claims that these programs make any significant difference in one's cognitive skills.
B) These programs are very useful for those with organic brain illnesses like dementia.
C) These programs are not useful for older adults, in whom brain decline may be irreversible, but they are useful for middle-aged adults who want to avoid such declines.
D) These programs have been found to have great benefit for adolescents, as reflected in higher overall school GPAs after as little as 3 months of use.
E) The research is, as of yet, inconclusive. Many studies have found significant effects, but others have found that these programs actually harm intellectual skills.

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