Effects of Scent and Scent Emission Methods: Implications on Workers’ Alertness, Vigilance, and Memory under Fatigue Conditions

Extant studies have revealed enhancing effects of scent on performance. The role of scent, and emission method, in the context of performing repetitive tasks over prolonged duration in promoting alertness, vigilance, and memory was examined. Seventy-three participants were randomly assigned to one of three conditions (no scent, peppermint scent emitted continuously, or peppermint scent emitted intermittently) while tasked to monitor and identify suspicious cues for close to 2 hr. Pre- and post-intervention surveys, psychomotor vigilance test, and eye tracker were used as study instruments. Results showed that scent directly enhanced information recall and mitigated the deterioration of alertness, especially as subjects became fatigued. Intermittent emission showed stronger effects over continuous emission in marginally enhancing alertness and memory. Scent did not appear to promote greater vigilance. Suggestions for future studies and implications for management of employees in fatigue situations are discussed.