This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.The predominant characterization of flow in sport has emphasized athletes' reports of reduced conscious attention and effort; however, this is difficult to reconcile with other reports of superior focus and lack of distraction. The aim of this study was to explore this tension by testing novel, theoretically driven predictions for subjective and objective mental effort and by assessing visual attention control using an experimental research design. Specifically, we predicted that perceived and actual effortful ...