Clarifying the concept of visual load: a systematic review
系统综述了119项研究，发现仅10%明确定义了视觉负荷，且定义高度异质，导致研究可比性差；提出视觉负荷应包含感知、认知和反应三个维度的总视觉处理需求。
Vision dominates human information processing, but visual load (VL) lacks a clear definition. Following PRISMA guidelines, this systematic review searched the Web of Science Core Collection, MEDLINE, and PsycINFO. 119 studies were included for analysis. Only 12 (10%) studies explicitly defined VL, and the definitions were highly heterogeneous. Various methods have been used to manipulate and measure VL, reflecting the lack of a unified framework. Our findings reveal that conceptual ambiguity impairs study comparability and practical use. We propose that VL should be conceptualised as the total visual processing demand imposed on an individual during visual tasks, encompassing three key dimensions: perception, cognition, and responding.