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The results indicated significant performance degradation when a master visual attention-getter was not used. Mean detection times were substantially slower in the absence of an attention-getter in the pilot's primary field of vision.
Source: wiktionary
Master caution and warning systems were developed to ease pilot workload, particularly on aircraft designed for operation without a flight engineer. In addition to the attention getter, it also directs the pilot towards the problem area concerned.
Source: wiktionary