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 routinely relied upon by concert musicians and public speakers as a proven way of calming their nerves shortly before a performance.
- Visualization is widely regarded as the single most powerful performance-enhancement technique now available to athletes competing in any sport.
- Several of the participating athletes described the daily visualization sessions as deeply soothing and said they genuinely looked forward to each one.
- Performance accuracy was measured using precisely the same standardized drills that professional scouts rely on to evaluate promising prospects.
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