Abstract
This article reviews literature concerning functional changes resulting from elevated blood pressure, from reduction of blood pressure, and as a result of the medications used to treat high blood pressure. The research reviewed includes the areas of psychomotor speed, intelligence and cognitive processing, sensory and perceptual processes, and emotional and interpersonal behaviors. The conclusions reached are that the deficits noted to date in hypertensive individuals are not extreme nor are they specific. The greatest disadvantage, however, appears in the area of response speed.
Similar content being viewed by others
References
Adler, S. (1974). Methyldopa-induced decrease in mental activity.JAMA 230: 1428–1429.
Alexander, F. (1939). Emotional factors in essential hypertension: Presentation of a tentative hypothesis.Psychosom. Med. 1: 173–179.
Apter, N., Halstead, W., and Heimberger, R. (1951). Impaired cerebral functions in essential hypertension.Am. J. Psychiat. 107: 808–813.
Baer, P., Collins, F., Bourianoff, G., and Ketchel, M. (1979). Assessing personality factors in essential hypertension with a brief self-report instrument.Psychosom. Med. 41: 321–330.
Bayliss, P., and Duncan, S. (1975). The effects of atenolol (Tenormin) and methyldopa on simple tests of central nervous function.Br. J. Clin. Pharmacol. 2: 527–531.
Beal, D., Dujovne, C., and Gillis, J. (1980). The effect of methyldopa on human judgment in hypertensive patients and normal volunteers.Res. Commun. Psychol. Psychiat. Behav. 5: 205–217.
Birren, J. (1965). Age changes in speed of behavior: Its central nature and physiological correlates. In A. Welford and J. Birren (Eds.),Behavior, Aging, and the Nervous System. Thomas, Springfield, Illinois.
Birren, J., Riegel, K., and Morrison, D. (1962). Age differences in response speed as a function of controlled variations of stimulus conditions: Evidence of a general speed factor.Gerontologia 6: 1–18.
Boller, F., Vrtunski, B., Mack, J., and Kim, Y. (1977). Neuropsychological correlates of hypertension.Arch. Neurol. 34: 701–705.
Botwinick, J. (1977). Intellectual abilities. In J. Birren and K. Schaie (Eds.),Handbook of the Psychology of Aging. Van Nostrand Reinhold, New York.
Botwinick, J. (1978). Slow response to environmental stimulation. In J. Botwinick,Aging and Behavior (2nd ed.), Springer, New York.
Broadhurst, A. (1980). The effect of propranolol on human psychomotor performance.Aviat. Space Environ. Med. 57: 176–179.
Bruce, J., and Thomas, C. (1953). A method of rating certain personality factors as determined by the Rorschach test for use in a study of the precursors of hypertension and coronary artery disease.Psychiat. Quart. Suppl. 27: 207–238.
Buck, L. (1966). Reaction time as a measure of perceptual vigilance.Psychol. Bull. 65: 291–304.
Chocholle, R. (1963). Les temps de réaction (Reaction times). In P. Fraisse and J. Piaget (Eds.),Traité de psychologie expérimentale: II. Sensation et motricite. (Treatise on experimental psychology: II. Sensation and motor activity). Presses Universitaires de France, Paris.
Clark, W. C. (1966). The psyche in psychophysics.Psychol. Bull. 65: 358–366.
Clark, W. C., Brown, J., and Rutschmann, J. (1967). Flicker sensitivity and response bias in psychiatric patients and normal subjects.J. Abnorm. Psychol. 72: 35–42.
Clark, W. C., Rutschmann, J., Link, R., and Brown, J. (1963). Comparison of flicker-fusion thresholds obtained by the methods of forced choice and limits on psychiatric patients.Percept. Motor Skills 16: 19–30.
Clausen, J. (1950). An evaluation of experimental methods of time judgment.J. Exp. Psychol. 40: 756–760.
Cochrane, R. (1971). High blood pressure as a psychosomatic disorder: A selective review.Br. J. Social Clin. Psychol. 10: 61–72.
Contreras, R. (1978). Salt taste and disease.Am. J. Clin. Nutrit. 31: 1090–1099.
Costa, P., and Shock, N. (1980). New longitudinal data on the question of whether hypertension influences intellectual performance. In M. Elias and D. H. P. Streeten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Costa, P., McRae, R., Andres, R., and Tobin, J. (1980). Hypertension, somatic complaints, and personality. In M. Elias and D. H. P. Streeten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Davies, M. (1971). Is high blood pressure a psychosomatic disorder? A critical review of the evidence.J. Chronic Dis. 24: 239–258.
Dustan, H., Tarazi, R., and Bravo, E. (1972). Physiologic characteristics of hypertension.Am. J. Med. 52: 610–622.
Elias, M. F., and Streeten, D. H. P. (Eds.). (1980).Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Enzer, N., Simonson, E., and Blankstein, S. (1942). Fatigue of patients with circulatory insufficiency, investigated by means of the fusion frequency of flicker.Ann. Intern. Med. 16: 701–707.
Ey, H., Bernard, P., and Brisset, C. (1974).Manuel de psychiatrie, Quatrieme Edition (Manuel of Psychiatry; 4th ed.). Masson, Paris.
Fallis, N., Lasagna, L., and Theteault, L. (1962). Gustatory thresholds in patients with hypertension.Nature 196: 74.
Fertig, H., Olmstead, F., and Corcoran, A. (1952). The fusion frequency of flicker in hypertension.Am. Heart J. 44: 261–267.
Foster, G., and Bell, S. (1983). Relation of state and trait anxiety to essential hypertension.Psychol. Rep. 52: 355–358.
Franceschi, M., Tancredi, D., Smirni, S., Mercinelli, A., and Canal, A. (1982). Cognitive processes in hypertension.Hypertension 4: 226–229.
Friedman, M., and Bennet, P. (1977). Depression and hypertension.Psychosoma. Med. 39: 134–142.
Galton, L. (1973).The Silent Disease: Hypertension. Crown, New York.
Genest, J., Kuchel, O., Hanet, P., and Lenden, N. (Eds.). (1983).Hypertension: Physiopathology and Treatment. McGraw-Hill, New York.
Ginsburg, N. (1970). Flicker fusion bibliography, 1953–1968.Percept. Motor Skills 30 (Suppl. 1-V30): 427–482.
Goldman, H., Kleinman, K., Snow, M., Bidus, D., and Korol, B. (1974). Correlation of diastolic blood pressure and signs of cognitive dysfunction in essential hypertension.Dis. Nervous System 35: 571–572.
Goldman, H., Kleinman, K., Snow, M., Bidus, D., and Korol, B. (1975). Relationship between essential hypertension and cognitive functioning: Effects of biofeedback.Psychophysiology 12: 569–573.
Goldstein, I. (1981). Assessment of hypertension. In L. Bradley and C. Prokop (Eds.),Medical Psychology: A New Perspective. Academic Press, New York.
Guyton, A. (1971). Regulation of mean arterial pressure, and hypertension. InTextbook of Medical Physiology (4th ed.). Saunders, Philadelphia.
Halstead, W. (1947).Brain and Intelligence. University of Chicago Press, Chicago.
Harburg, E., Julius, S., McGinn, N., McLeod, J., and Hoobler, S. (1964). Personality traits and behavioral patterns associated with systolic blood pressure levels in college males.J. Chronic Dis. 17: 405–414.
Harrell, J. (1980). Psychological factors and hypertension: A status report.Psychol. Bull. 87: 482–501.
Harris, R., and Singer, M. (1968). Interaction of personality and stress in the pathogenesis of essential hypertension.Hypertension 16: 104–115.
Heine, B., Sainsbury, P., and Cheynometh, R. (1969). Hypertension and emotional disturbance.J. Psychiat. Res. 7: 119–130.
Hickler, R. (1983). Aging and hypertension: Hemodynamic implications of systolic pressure trends.J. Am. Geriat. Soc. 31: 421–425.
Hicks, L., and Birren, J. (1970). Aging, brain damage, and psychomotor slowing.Psychol. Bull. 74: 377–396.
Intellectual performance in hypertensive patients. (1984).Lancet, 1(No. 8368): 87.
Kalis, B., Harris, R., Bennett, C., and Sokolow, M. (1961). Personality and life history factors in persons who are potentially hypertensive.J. Nervous Mental Dis. 132: 457–468.
Kalis, B., Harris, R., Sokolow, M., and Carpenter, L. (1957). Response to psychological stress in patients with essential hypertension.Am. Heart J. 53: 572–578.
Kaplan, N. (1980). The control of hypertension: A therapeutic breakthrough.Am. Scient. 68: 537–545.
Kausler, D. (1982).Experimental Psychology and Human Aging. Wiley, New York.
Kidson, M. (1973). Personality and hypertension.J. Psychosom. Res. 17: 35–41.
King, H. E. (1954).Psychomotor Aspects of Mental Disease. Harvard University Press, Cambridge, Massachusetts.
King, H. E. (1956). Comparison of fine psychomotor movement by hypertensive and hypotensive subjects.Percept. Motor Skills 6: 199–204.
King, H. E. (1962). Two-flash and flicker fusion thresholds for normal and schizophenic subjects.Percept. Motor Skills, 14, 517–518.
King, H. E. (1965). Psychomotor changes with age, psychopathology, and brain damage. In A. Welford and J. Birren (Eds.),Behavior, Aging and the Nervous System. Thomas, Springfield, Illinois.
King, H. E. (1968). Psychomotor tests in experimental abnormal psychology. In J. Zubin and E. Burdock (Eds.),Experimental Abnormal Psychology (rev. ed.). Library of Congress ADI 9908, Washington, DC.
King, H. E. (1969). Psychomotility: A dimension of behavior disorder. In J. Zubin and C. Shagass (Eds.),Neurobiological Aspects of Psychopathology. Grune & Stratton, New York.
King, H. E. (1974).The rating of behavior exhibited during psychological testing: A description of the Tulane Test-Behavior Scale. ASIS/NAPS No. 02483, New York.
King, H. E. (1975). Psychomotor correlates of behavior disorder. In M. Kietzman (Ed.),Experimental Approaches to Psychopathology. Academic Press, New York.
King, H. E., Miller, R., Fitzgibbon, K., and Shapiro, A. (1986). Test taking behaviors by hypertensive and normotensive individuals.J. Psychol. 120 (4): 309–321.
King, H. E., Miller, R., Shapiro, A., and Fitzgibbon, K. (1985). Similarities and differences in test taking behaviors by hypertensive and normotensive subjects.Virginia J. Sci. 36: 162 (abstract).
Kleinman, K., Goldman, H., Snow, M., and Korol, B. (1977). Relationship between essential hypertension and cognitive functioning: Effects of biofeedback training generalize to non-laboratory environment.Psychophysiology 14: 192–197.
Krantz, D., and Glass, D. (1984). Personality, behavior patterns and physical illness: Conceptual and methodological issues. In W. Gentry (Ed.),Handbook of Behavioral Medicine. Guilford, New York.
Krantz, D., and Manuck, S. (1984). Acute psychophysiologic reactivity and risk of cardiovascular disease: A review and methodologic critique.Psychol. Bull. 96: 435–464.
Krantz, D., Baum, A., and Singer, J. (Eds.). (1983).Handbook of Psychology and Health, Vol. 3: Cardiovascular Diseases. Erlbaum, Hillsdale, New Jersey.
Krasno, L., and Ivy, A. (1950). The response of flicker fusion threshold to nitroglycerine and its potential value in the diagnosis, prognosis and therapy of subclinical and clinical cardiovascular disease.Circulation 1: 1267–1276.
Laake, K. (1981). Antianginal and beta-adrenoceptor blocking drugs. In M. N. G. Dukes (Ed.),Side Effects of Drugs Annual (5th ed.). Excerpta Medica, Amsterdam.
Landis, C. (1954). Determinants of the critical flicker fusion threshold.Physiol. Rev. 34: 259–286.
Landis, C., and Hamwi, V. (1954). The effect of certain physiological determinants on the flicker fusion threshold.J. Appl. Psychol. 6: 566–572.
Landis, C., Clausen, J., and Gjesuik, A. (1955). Effect of varying stimulus conditions on the flicker fusion threshold when nitroglycerine or the cold pressor test was applied.J. Appl. Physiol. 7: 513–518.
Lauer, R., Filer, L., Reiter, M., and Clarke, W. (1976). Blood pressure, salt preference, salt threshhold, and relative weight.Am. J. Dis. Children 130: 493–498.
Leplat, J. (1963). Les Liaisons sensori-motrices (Sensorimotor connections). In P. Fraisse and J. Piaget (Eds.),Traité de psychologie experiméntale: II. Sensation et motricite. (Treatise on experimental psychology: II. Sensation and motor activity). Presses Universitaires de France, Paris.
Levinson, J. (1968). Flicker fusion phenomena.Science 160: 21–28.
Levy, R., and Moskowitz, J. (1982). Cardiovascular research: Decades of progress, a decade of promise.Science 217: 121–129.
Light, K. (1975). Slowing of response time in young and middle-aged hypertensive patients.Exp. Aging Res. 1: 209–227.
Light, K. (1978). Effects of mild cardiovascular and cerebrovascular disorders on serial reaction time performance.Exp. Aging Res. 4: 3–22.
Light, K. (1980a). Hypertension and response slowing. In M. F. Elias and D. H. P. Streeten (Eds.),Hypertension and Cognitive Processes. 32: Beech Hill, Mount Desert, Maine.
Light, K. (1980b). Antihypertensive drugs and behavioral performance. In M. F. Elias and D. G. P. Streeten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Lynch, J. (1982). Interpersonal aspects of blood pressure control.J. Nervous Mental Dis. 170: 143–153.
Manuck, S., Morrison, R., and Bellack, A. (in press). Psychological factors in hypertension. inPsychophysiological, Biobehavioral, and Epidemiologic Aspects of Hypertension. NIH, Bethesda, Maryland.
Marx, A. (1976). Hypertension. A complex disease with complex causes.Science 194: 821–825.
Mattes, R., Kumanyika, S., and Halpern, B. (1983). Salt taste responsiveness and preference among normotensive, prehypertensive and hypertensive adults.Chem. Senses 8: 27–40.
McClelland, D. (1979). Inhibited power motivation and high blood pressure in men.J. Abnorm. Psychol. 88: 182–190.
McGinn, N., Harburg, E., Julius, S., and McLeod, J. (1964). Psychological correlates of blood pressure.Psychol. Bull. 61: 209–219.
Melville, D., and Raftery, E. (1981). Blood pressure changes during acute mental stress in hypertensive subjects using the Oxford intra-arterial system.J. Psychosom. Res. 25: 487–497.
Michell, A. (1978). Salt appetite, salt intake, and hypertension: A deviation of perspective.Perspect. Biol. Med. 21: 335–347.
Miller, R., Shapiro, A., King, H. E., Ginchereau, E., and Hosutt, J. (1984). Effect of antihypertensive treatment on the behavioral consequences of elevated blood pressure.Hypertension 6: 202–208.
Monk, M. (1980). Psychologic status and hypertension.Am. J. Epidemiol. 112: 200–208.
Obrist, P. (1976). The cardiovascular-behavioral interaction-As it appears today.Psychophysiology 13: 95–107.
O'Neill, M. (1976). A study of manifest needs with self-actualization.Nurs. Res. 25: 349–351.
Ostfeld, A. (1973). What's the payoff in hypertension research?Psychosom. Med. 35, 1–3.
Parsons, I., and Prigitano, G. (1978). Methodological considerations in clinical neuropsychological research.J. Consult. Clin. Psychol. 46: 608–619.
Pentz, C., Elias, M., Wood, W., Schultz, N., and Dineen, J. (1979). Relationship of age and hypertension to neuropsychological test performance.Exp. Aging Res. 5: 351–372.
Pickering, G. (1972). Hypertension: Definitions, natural histories and consequences.Am. J. Med. 52: 570–583.
Pilowsky, I., Spalding, D., Shaw, J., and Korner, P. (1973). Hypertension and personality.Psychosom. Med. 35: 50–56.
Reitan, R. (1954). Intellectual and affective changes in essential hypertension.Am. J. Psychiat. 110: 817–824.
Reitan, R. (1958). Validity of the trail making test as an indication of organic brain damage.Percept. Motor Skills 8: 271–276.
Richer, F., Silverman, C., and Beatty, J. (1983). Response selection and initiation in speeded reactions: A pupillometric analysis.J. Exp. Psychol. 9: 360–370.
Richter-Heinrich, E., and Laüter, J. (1969). A psychophysiological test as diagnostic tool with essential hypertensives.Psychother. Psychosom. 17: 153–168.
Robinson, J. (1962). A study of enuroticism and casual arterial blood pressure.Br. J. Soc. Clin. Psychol. 2: 56–64.
Safar, M., Kamiencka, H., Levenson, J., Demetriu, V., and Pauleau, N. (1978). Hemodynamic factors and Rorschach testing in borderline and sustained hypertension.Psychosom. Med. 40: 620–631.
Sainsbury, P. (1964). Neuroticism and hypertension in an outpatient population.J. Psychosom. Res. 8: 235–238.
Sapira, J., Scheib, E., Moriarty, R., and Shapiro, A. (1971). Differences in perception between hypertensive and normotensive populations.Psychosom. Med. 33: 239–250.
Schalling, D., and Svensson, J. (1984). Blood pressure and personality.Personal. Individ. Diff. 5: 41–51.
Scher, J., and Spankus, W. (1955). Flicker fusion frequency and hypertension.Am. J. Ophthalmol. 39: 705–717.
Schultz, N., and Elias, M. F. (1980). The effects of hypertension on WAIS performance. In M. F. Elias and D. H. P. Stretten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Schultz, N., Dineen, J., Elias, M., Pentz, C., and Wood, W. (1979). WAIS performance for different age groups of hypertensive and control subjects during the administration of a diuretic.J. Gerontol. 34: 246–253.
Schwartz, G., Shapiro, A., Redmond, D., Ferguson, D., Ragland, E., and Weiss, S. (1979). Behavioral medicine approaches to hypertension: An integrative analysis of theory and research.Behav. Med. 2: 311–363.
Scotch, H., and Geiger, H. (1963). The epidemiology of essential hypertension: A review with special attention to the psychological and sociocultural factors. II. Psychologic and cultural factors in etiology.J. Chronic Dis. 16: 1183–1213.
Seashore, R., Buxton, C., and McCullom, I. (1940). Multiple factorial analysis of fine motor skills.Am. J. Psychol. 53: 251–259.
Shapiro, A. (1973). Essential hypertension—why idiopathic?Am. J. Med. 54: 1–5.
Shapiro, A. (1979). The role of stress in hypertension.J. Human Stress, 5: 7–26.
Shapiro, A. (1983). Psychological and social factors in hypertension. In J. Genest, O. Kuchel, P. Hanet, and M. Lenden (Eds.),Hypertension: Physiopathology and Treatment. McGraw-Hill, New York.
Shapiro, A. (1985). Clinical relevance of the pharmacological characteristics of beta-adrenergic blocking agents in treatment of hypertension. In J. Drayer and M. Weber (Eds.),Drug Therapy in Hypertension (in press).
Shapiro, A., Miller, R., King, H. E., Ginchereau, E., and Fitzgibbon, K. (1982). Behavioral consequences of mild hypertension.Hypertension 4: 355–360.
Shapiro, A., Redmond, D., McDonald, R., and Gaylor, M. (1975). Relationships of perception, cognition, suggestion and operant conditioning in essential hypertension.Prog. Brain Res. 42: 299–312.
Shapiro, A., Schwartz, G., Redmond, D., Ferguson, D., and Weiss, S. (1977). Behavioral methods in the treatment of hypertension.Ann. Intern. Med. 86: 626–637.
Shapiro, D., and Goldstein, I. (1982). Biobehavioral perspectives on hypertension.J. Consult. Clin. Psychol. 50: 841–858.
Simonson, E., and Enzer, N. (1941). State of motor centers in circulatory insufficiency.Arch. Intern. Med. 68: 498–512.
Solomon, S., Hotchkiss, E., Saravay, S., Bayer, C., Ramsey, P., and Blum, R. (1983). Impairment of memory function by antihypertension medication.Arch. Gen. Psychiat. 40: 1109–1112.
Spieth, W. (1962). Abnormally slow perceptual-motor task performances in individuals with stable, mild to moderate heart disease.Aerospace Med. 33: 370.
Spieth, W. (1964). Cardiovascular health status, age and psychological performance.J. Gerontol. 19: 277–284.
Spieth, W. (1965). Slowness of task performance and cardiovascular diseases. In A. Welford and J. Birren (Eds.),Behavior, Aging, and the Nervous System. Thomas, Springfield, Illinois.
Spieth, W. (1967). Psychologic reaction to cardiovascular damage in the aged.Mayo Clin. Proc. 42: 620–636.
Steptoe, A. (1981).Psychological Factors in Cardiovascular Disorders. Academic Press, New York.
Steptoe, A., Melville, D., and Ross, A. (1984). Behavioral response demands, cardiovascular reactivity, and essential hypertension.Psychosom. Med. 46: 33–48.
Svensson, T., and Theorell, T. (1982). Cardiovascular effects of anxiety induced by interviewing young hypertensive male subjects.J. Psychosom. Res. 26: 359–370.
Szafran, J. (1965). Decision processes and aging. In A. Welford and J. Birren (Eds.),Behavior, Aging, and the Nervous System. Thomas, Springfield, Illinois.
Taylor, C., and Fortmann, S. (1983). Essential hypertension.Psychosomatics 24: 433–448.
Vaidya, A., Srivastava, S., and Kumar, A. (1983). Extraversion and neuroticism in hypertensive patients.Perspect. Psychol. Res. 6: 86–87.
Vega, A., and Parsons, O. (1967). Cross-validation of the Halstead-Reitan tests for brain damage.J. Consult. Psychol. 31: 619–625.
Wechsler, D. (1955).Wechsler Adult Intelligence Scales. Psychological Corporation, New York.
Weiner, H. (1972). Some comments on the transduction of experience by the brain: Implications for an understanding of the relation of mind to body.Psychosom. Med. 34: 355–380.
Weiner, H. (1976). Lessons taught by experimental high blood pressure research.Psychosom. Med. 38: 297–298.
Weiner, H. (1979).Psychobiology of Essential Hypertension. Elsevier, New York.
Weiner, H., Singer, M., and Reiser, M. (1962). Cardiovascular responses and their psychophysiologic correlates: A study in healthy young adults and patients with peptic ulcer and hypertension.Psychosom. Med. 24: 477–498.
Wennerholm, M., and Zarle, T. (1976). Internal-external control, defensiveness, and anxiety in hypertensive patients.J. Clin. Psychol. 32: 644–648.
Wilkie, F., and Eisdorfer, C. (1971). Intelligence and blood pressure in the aged.Science 172: 959–962.
Wilkie, F., and Eisdorfer, C. (1980). Hypertension and tests of memory. In M. Elias and D. H. P. Streeten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Wilkie, F., Eisdorfer, C., and Nowlin, J. (1976). Memory and blood pressure in the aged.Exp. Aging Res. 2: 3–16.
Williams, R., Kimball, C., and Williard, H. (1972). The influence of interpersonal interaction on diastolic blood pressure.Psychosom. Med. 34: 194–198.
Wood, W., and Elias, M. (1980). Essential hypertension and neuropsychological test performance. In M. Elias and D. H. P. Streeten (Eds.),Hypertension and Cognitive Processes. Beech Hill, Mount Desert, Maine.
Woodworth, R. (1938). Reaction time. In R. Woodworth (Ed.),Experimental Psychology. Holt, New York.
Working Group on Risk and High Blood Pressure. (1985). An epidemiological approach to describing risk associated with blood pressure levels.Hypertension 7: 641–651.
Zamir, N., and Shuber, E. (1980). Altered pain perception in hypertensive humans.Brain Res. 201: 471–474.
Zanchetti, A., Bacelli, G., and Mancia, G. (1971). Cardiovascular effects of emotional behavior. In C. Bartorelli and A. Zanchetti (Eds.),Cardiovascular Regulations in Health and Disease. Institute of Cardiovascular Research, Milan.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
King, H.E., Miller, R.E. Hypertension: Cognitive and behavioral considerations. Neuropsychol Rev 1, 31–73 (1990). https://doi.org/10.1007/BF01108858
Issue Date:
DOI: https://doi.org/10.1007/BF01108858