Similar sport-specific performance improvement was found in the earlier study conducted by Smith, Wright, Allsopp, and Westhead (2007).

Smith, Wright, Allsopp, and Westhead (2007) compared the effects of PETTLEP-based imagery against the improvements found with the use of traditional imagery, in hockey players and gymnasts. In the first study, 48 varsity hockey players were divided into four groups. These groups included: 'sport-specific' imagery, 'clothing' imagery, 'traditional' imagery, and a control group. Following a six-week period, the sport-specific group saw the most improvement in penalty flicks. Other than the control group, the traditional imagery group experienced the least amount of improvement. The author's second study featured 40 junior gymnasts. These participants were divided into four groups that included: PETTLEP, stimulus only imagery, physical practice, and a control group. As was found in both Wright and Smith's (2009) and Smith, Wright, and Cantwell's (2008) research, there was significant improvement in both the...
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