medium · LSAT Logical Reasoning
A study of professional athletes found that those who practiced visualization techniques for twenty minutes a day showed a ten percent improvement in their performance accuracy. The researchers concluded that mental rehearsal is an effective tool for improving physical coordination.
Which one of the following, if true, most seriously weakens the researchers' conclusion?
- The athletes assigned to the visualization regimen were also given additional one-on-one coaching sessions that the comparison group never received.
- Visualization is regularly relied upon by concert musicians and public speakers as a way of calming their nerves before a performance.
- Visualization has been shown to be the most powerful performance-enhancement method available to athletes in any sport.
- A number of the participating athletes described the visualization sessions as soothing and said they looked forward to them each day.
- Performance accuracy was assessed using the same standardized drills employed by professional scouts to evaluate prospects.
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