<b>Background</b><br />
An important component of mental training in sport is the utilization of positive imagery. The “human brain cannot distinguish between an imagined experience and a real experience. The same areas of the brain light up in an imagined experience or imagined performance as in a real experience or performance. For that reason, positive performance imagery has enormous potential” (Orlick, 2008, p. 101). Imagery “has been described as a centre pillar of applied sport psychology” research (Morris, Spittle, & Perry, 2004, p. 344). The aim of the present study was to examine reliability and validity characteristics of the Polish language version of the Sport Imagery Ability Measure (SIAM).<br />
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<b>Participants and procedure</b><br />
Polish athletes (N = 316) from a range of sports and competitive levels completed the 48 item SIAM. The participants (163 male, 153 female) were aged between 12 and 57 years (M = 22.15, SD = 8.25).<br />
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<b>Results</b><br />
Results indicated that the SIAM had sound internal consistency and maintained good stability over a 3-week period. Confirmatory factor analysis demonstrated that the a priori 3-factor structure of the SIAM resulted in a set of acceptable and poor fit indices (CFI = .91, NFI = .90, RMSEA = .12). Finally, differences in athletes’ imagery abilities were examined in relation to competitive level, gender, and age.<br />
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<b>Conclusions</b><br />
Overall, results generally supported the reliability and construct validity of the Polish version of the SIAM.