EFFECTS OF OLFACTORY STIMULATION 209 role in the regulation and maintenance of vigilance (28). These possibilities warrant further investigation. Finally, note that beyond providing the initial experimental demonstration that certain fragrances can bolster sustained attention, our results have meaning for an even broader issue, that of intersensory interaction. Studies of interactions among stimuli in different sense modalities have, for the most part, been confined to combinations drawn from the auditory, visual, and tactual modes (29). To our knowledge, the data described in this paper are the first to show that accessory olfactory stimulation can enhance the detection of visual stimuli. CONCLUSIONS The results of this study indicate that exposure to whiffs of air scented with the fragrance of Muguet or Peppermint can enhance the rate of signal detections in a vigilance task without a concomitant increase in errors of commission. These findings suggest that exposure to fragrance may serve as an effective form of ancillary stimulation in tasks demanding close attention for prolonged periods of time. ACKNOWLEDGMENTS This paper is based on an invited address given at the Annual Scientific Seminar of the Society of Cosmetic Chemists, San Francisco, CA, May 11, 1990, and a talk given at the Annual Meeting of the Psychonomic Society, New Orleans, LA, Nov. 17, 1990. We are grateful to Marina Munteanu, Craig Warren, and Steven Warrenberg of Inter- national Flavors and Fragrances, Inc., for suggesting that we undertake the research and for providing extensive technical assistance to Jonathan Gluckman, Sandy Matthews, Judith A. Thiemann, and Mary Anne Toledo, for invaluable help with instrumentation and data collection and to the Fragrance Research Fund for financial support. REFERENCES (1) D. R. Davies and R. Parasuraman, The Psychology of Vigilance (Academic Press, London, 1982), pp. 5-9. (2) J. S. Warm, "An Introduction to Vigilance," in Sustained Attention in Human Performance, J. S. Warm, Ed. (Wiley, Chichester, U.K., 1984), pp. 1-14. (3) K. Neuchterlein, R. Parasuraman, and W. Jiang, Visual sustained attention: Image degradation produces rapid sensitivity decrement over time, Science, 220, 327-329 (1983). (4) M. Frankenhaeuser, B. Nordheden, A. L. Myrsten, and B. Post, Psychophysiological reactions to understimulation and overstimulation, Acta Psychol., 35, 298-308 (1971). (5) U. Lundberg and M. Frankenhaeuser, Pituitary-Adrenal and Sympathetic-Adrenal Correlates of Distress and Effort, Report No. 548 (University of Stockholm Department of Psychology, Stockholm, 1979). (6) C. A. Hovanitz, K. Chin, and J. S. Warm, Complexities in life stress•lysfunction relationships: A case in point--Tension headache, J. Behav. Med., 12, 55-75 (1989). (7) R. I. Thackray, J. P. Bailey, and R. M. Touchstone, "Physiological, Subjective and Performance Correlates of Reported Boredom and Monotony While Performing a Simulated Radar Control Task," in Vigilance: Theory, Operational Performance and Physiological Correlates, R. R. Mackie Ed. (Plenum, New York, 1977), pp. 203-215. (8) J. D. Deaton and R. Parasuraman, "Effects of Task Demands and Age on Vigilance and Subjective

210 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (lO) (11) (12) (13) (14) Workload," in Proceedings of the Human Factors Society (Santa Monica, California, 1988), pp. 1458- 1462. (9) J. P. Gluckman, J. S. Warm, W. N. Dember, J. A. Thiemann, and P. A. Hancock, Subjective workload in simultaneous and successive vigilance tasks. Paper presented at the meeting of the Psychonomic Society, Chicago, 1988. J. D. Zuercher, The effects of extraneous stimulation on vigilance, Human Factors, 7, 101-106 (1965). W. G. Davenport, Vigilance and arousal: Effects of different types of background stimulation, J. Psych., 82, 339-346 (1972). J. J. McGrath, "Irrelevant Stimulation and Vigilance Performance," in Vigilance.' A Symposium, D. N. Buckner and J. J. McGrath, Eds. (McGraw-Hill, New York, 1963), pp. 3-21. M. E. Keister and R. J. McLaughlin, Vigilance performance related to extraversion-introversion and caffeine, J. Exper, Res. in Pers., 6, 5-11 (1972). M. Loeb, G. R. Hawkes, W. O. Evans, and E. A. Alluisi, The influence of d-amphetamine, ben- actyzine and chlorpromazine on performance in an auditory vigilance task, Psychon. Sci., 3, 29-30 (1965). (15) A.D. Baddeley, Human Memory.' Theory and Practice (Allyn and Bacon, Boston, 1990), pp. 67-95. (16) M. C. Gerald, Pharmacology: An Introduction to Drugs (Prentice-Hall, Englewood-Cliffs, New Jersey, 1981), pp. 178-192. (17) J. T. E. Richardson and G. M. Zucco, Cognition and olfaction: A review, Psychol. Bull., 105, 325-360 (1989). (18) R. Sekuler and R. Blake, Perception, 2nd. ed. (Knopf, New York, 1990), pp. 384-423. (19) J. R. King, "Anxiety Reduction Using Fragrances," in Perfumery: The Psychology and Biology of Fra- grance, S.S. Van Toller and G. H. Dodd, Eds. (Chapman and Hall, London, 1988), pp. 147-166. (20) T. S. Lorig and G. E. Schwartz, Brain and odor: I. Alteration of human EEG by odor administration, Psychobiol., 16, 281-284 (1988). (21) G. E. Schwartz, D. Whitehorn, J. C. Hernon, and M. Jones, Subjective and respiratory differenti- ation of fragrances: Interactions with hedonics, Psychobiol., 23, 460 (1986). (22) H. Yoshitake, Three characteristic patterns of subjective fatigue symptoms, Ergonomics, 21, 231-233 (1978). (23) E. Hoddes, V. Zarcone, H. Smythe, R. Phillips, and W. C. Dement, Quantification of sleepiness: A new approach, Psychophysiol., 10, 431-436 (1973). (24) F. T. Eggemeier, "Properties of Workload Assessment Techniques," in Human Mental Workload, P. A. Hancock and N. Meshkati, Eds. (Elsevier, Amsterdam, 1988), pp. 41-62. (25) S. G. Hart and L. E. Staveland, "Development of NASA-TLX (Task Load Index): Results of Empir- ical and Theoretical Research," in Human Mental Workload, P. A. Hancock and N. Meshkati, Eds. (Elsevier, Amsterdam, 1988), pp. 139-183. (26) A. Craig and W. P. Colquhoun, "Vigilance: A Review," in Human Reliability in Quality Control, C. G. Drury and J. G. Fox, Eds. (Taylor and Francis, London, 1975), pp. 71-87. (27) J. W. Scott, "The Central Olfactory Connections and Their Cells of Origin," in Taste, Olfaction, and the Central Nervous System," D. W. Pfaff, Ed. (The Rockefeller University Press, New York, 1985), pp. 282-283. (28) R. Parasuraman, "The Psychobiology of Sustained Attention," in Sustained Attention in Human Per- formance, J. S. Warm, Ed. (Wiley, Chichester, U.K., 1984), pp. 61-101. (29) R. B. Welch and D. H. Warren, "Intersensory Interactions," in Handbook of Perception and Human Performance, K. R. Boff, L. Kaufman, and J. P. Thomas, Eds. (Wiley, New York, 1986), Vol. 1, pp. 25-1-25-36.