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Playing action video game can substantially improve visual performance. Here we consider the mechanisms that support such improvements. Using the equivalent external noise technique (Lu & Dosher, 1998), we found improved thresholds across a wide range of external noise levels (downward shifts of TvC curves) in Action Video-Game Players (VGPs) as compared to Non-Action Video-Game Players (NVGPs). Both the perceptual template model and a probabilistic neural model (Bejjanki et al, 2011) explain the improved TvC functions in terms of better task-relevant perceptual templates utilized by the VGP group. How does action video game experience improve the quality of the perceptual templates? One possibility is that action video game experience increases general visual sensitivity. If that is the case, the VGP advantage would be present on the very first trial of any visual task, and would not require any …