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We examined in detail effects of priming in 2 mental rotation strategies: spinning (rotating in a picture plane) and flipping (rotating in depth around a horizontal axis) by using a priming paradigm of Kanamori and Vagi (2002). The priming paradigm included prime and probe tasks within 1 trial. In the prime task, 16 participants were asked to mentally rotate an inverted object to upright. In the probe task, they were asked to judge whether 2 objects simultaneously presented were the same or different. In result, the priming effect was observed in the upright position in both strategies, but not in the inverted and intermediate position while using a flipping strategy. The result in the present study was consistent with that of Kanamori and Vagi (2002). In conclusion, when the 2 strategies for transformation of inverted images to upright images are used, apparent differences are observed in each direction of rotation. The results suggested that mental rotation occurred during the spinning strategy, but another transformation of images rather than mental rotation occurred during the flipping strategy. The line-symmetrical transformation around the horizontal axis might be used in the flipping strategy.