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The aim of the study was to assess the effects of manipulating video speeds on visual behavior and decision accuracy of 10 amateur football assistant referees (ARs) when perceived video sequences of 24 possible offside actions on a large screen. An eye tracker was used to analyze participants’ visual behaviors. Signal detection analysis provided further detail of participants’ decision-level accuracy. Participants were required to decide when they perceived a player to be offside during observed sequences with different video speed manipulations ( Normal speed ,  2 speed , and  3 speed ). Results revealed that the manipulation of video speed did not attune emergent gaze patterns differently because participants displayed similar visual behaviors, regardless of speed. However, the  normal speed  resulted in a higher percentage of correct decisions than the  3 speed . Participants tended toward non-flagging decision bias errors when judging offsides with the  3 speed  because they made more misses, than false alarms.

Influence of Video Speeds on Visual Behavior and Decision-Making of Amateur Assistant Referees Judging Offside Events