Among some gifted education researchers, advocates, and practitioners, it is sometimes believed that there is a larger number of gifted people in the general population than would be predicted from a normal distribution (e.g., Gallagher, 2008; N. M. Robinson, Zigler, & Gallagher, 2000; Silverman, 1995, 2009), a belief that we termed the “overabundance hypothesis.” We tested this hypothesis by searching public datasets and the published literature for large representative datasets, 10 of which were found in 6 sources. Results indicated that the overabundance hypothesis was mostly unsupported by the data. Moreover, most datasets included approximately the same (or fewer) gifted individuals than would be predicted from a normal distribution. We conclude the article by exploring the theoretical reasons why the overabundance is likely untrue and why some might believe otherwise.
BurtC. (1917). The distribution and relations of educational abilities. London, England: P.S. King.
3.
BurtC. (1921). Mental and scholastic tests. London, England: P.S. King.
4.
BurtC. (1957). Distribution of intelligence. British Journal of Psychology, 48, 161-175. doi:10.1111/j.2044-8295.1957.tb00614.x
5.
BurtC. (1963). Is intelligence distributed normally?British Journal of Statistical Psychology, 16, 175-190. doi:10.1111/j.2044-8317.1963.tb00208.x
6.
CaytonT. (2008, November). Wechsler’s “ability to an extraordinary degree”: Extended norms on the WISC-IV. Paper presented at the meeting of the National Association for Gifted Children, Tampa, FL.
7.
DearyI. J.ThorpeG.WilsonV.StarrJ. M.WhalleyL. J. (2003). Population sex differences in IQ at age 11: The Scottish mental survey 1932. Intelligence, 31, 533-542. doi:10.1016/s0160-2896(03)00053-9
8.
DearyI. J.WhitemanM. C.StarrJ. M.WhalleyL. J.FoxH. C. (2004). The impact of childhood intelligence on later life: Following up the Scottish Mental Surveys of 1932 and 1947. Journal of Personality and Social Psychology, 86, 130-147. doi:10.1037/0022-3514.86.1.130
9.
FlynnJ. R. (1987). Massive IQ gains in 14 nations: What IQ tests really measure. Psychological Bulletin, 101, 171-191. doi:10.1037/h0090408
10.
GallagherJ. J. (2008). According to Jim: The flawed normal curve of intelligence. Roeper Review, 30, 211-212. doi:10.1080/02783190802363877
GottfredsonL. S. (1997a). Mainstream science on intelligence: An editorial with 52 signatories, history, and bibliography. Intelligence, 24, 13-23. doi:10.1016/S0160-2896(97)90011-8
13.
GottfredsonL. S. (1997b). Why g matters: The complexity of everyday life. Intelligence, 24, 79-132.doi:10.1016/S0160-2896(97)90014-3
14.
GottfredsonL. S. (2000). Skill gaps, not tests, make racial proportionality impossible. Psychology, Public Policy, and Law, 6, 129-143. doi:10.101317//1076-8971.6.1.129
15.
GottfredsonL. S. (2003). The science and politics of intelligence in gifted education. In ColangeloN.DavisG. A. (Eds.), Handbook of gifted education (3rd ed., pp. 24-40). Boston, MA: Allyn & Bacon.
16.
GuldemondH.BoskerR.KuyperH.van der WerfG. (2007). Do highly gifted students really have problems?Educational Research and Evaluation, 13, 555-568.
17.
GallagherJ. J. (1998). Accountability for gifted students. Phi Delta Kappan, 79, 739-742.
18.
HerrnsteinR. J.MurrayC. (1996). The bell curve: Intelligence and class structure in American life (2nd ed.). New York, NY: Free Press.
19.
HollingworthL. S. (1942). Children above 180 IQ, Stanford-Binet: Origin and development. Yonkers-on-Hudson, NY: World Book.
20.
JensenA. R. (1998). The g factor: The science of mental ability. Westport, CT: Praeger.
21.
JohnsonW.CarothersA.DearyI. J. (2008). Sex differences in variability in general intelligence: A new look at the old question. Perspectives on Psychological Science, 3, 518-531. doi:10.1111/j.1745-6924.2008.00096.x
22.
KaplanR. M.SaccuzzoD. P. (2009). Psychological testing: Principles, applications, and issues (7th ed.). Belmont, CA: Wadsworth.
23.
KonigsbergE. (2006, January). Prairie fire. New Yorker, 81(44), 44-57.
24.
KuhnT. S. (1996). The structure of scientific revolutions (3rd ed.). Chicago, IL: University of Chicago Press.
25.
MarksG.MillerN. (1987). Ten years of research on the false-consensus effect: An empirical and theoretical review. Psychological Bulletin, 102, 72-90. doi:10.1037/0033-2909.102.1.72
26.
McGuffogC.FeiringC.LewisM. (1987). The diverse profile of the extremely gifted child. Roeper Review, 10, 82-89. doi:10.1080/02783198709553090
27.
NisbettR. E.AronsonJ.BlairC.DickensW.FlynnJ.HalpernD. F.TurkheimerE. (2012). Intelligence: New findings and theoretical developments. American Psychologist, 67, 130-159. doi:10.1037/a0026699
28.
ParkynG. W. (1945). The clinical significance of IQ’s on the Revised Stanford-Binet Scale. Journal of Educational Psychology, 36, 114-118. doi:10.1037/h0055705
29.
PlominR.PetrillS. A. (1997). Genetics and intelligence: What’s new?Intelligence, 24, 53-77. doi:10.1016/s0160-2896(97)90013-1
30.
RavenJ.RavenJ. C.CourtJ. H. (1998). Manual for Raven’s progressive matrices and vocabulary scales, section 1: General overview. San Antonio, TX: Pearson.
31.
RobinsonH. B. (1981). The uncommonly bright child. In LewisM.RosenblumL. A. (Eds.), The uncommon child: Genesis of behavior (pp. 57-81). New York, NY: Plenum.
32.
RobinsonN. M.ZiglerE.GallagherJ. J. (2000). Two tails of the normal curve: Similarities and differences in the study of mental retardation and giftedness. American Psychologist, 55, 1413-1424. doi:10.1037/0003-066X.55.12.1413
33.
Scottish Council for Research in Education. (1933). The intelligence of Scottish children. London, England: University of London Press.
34.
Scottish Council for Research in Education. (1949). The trend of Scottish intelligence: A comparison of the 1947 and 1932 surveys of the intelligence of eleven-year-old pupils. London, England: University of London Press.
35.
SilvermanL. K. (1995). Highly gifted children. In GenschaftJ.BirelyM.HollingerC. (Eds.), Serving gifted and talented students (pp. 217-240). Austin, TX: Pro-Ed.
36.
SilvermanL. K. (2009). The measurement of giftedness. In ShavininaL. V. (Ed.), International handbook of giftedness (pp. 947-970). Dordrecht, The Netherlands: Springer Science & Business Media.
SilvermanL. K. (2013). Giftedness 101. New York, NY: Springer.
39.
SilvermanL.K.KearneyK. (1992). Don’t throw away the old Binet. Understanding Our Gifted, 4(4), 7-10.
40.
SimontonD. K. (2005). Giftedness and genetics: The emergenic-epigenetic model and its implications. Journal for the Education of the Gifted, 28, 270-286. doi:10.4219/jeg-2005-338
41.
TermanL. M. (1916). The measurement of intelligence: An explanation of and a complete guide for the use of the Stanford revision and extension of the Binet-Simon Intelligence Scale. New York, NY: Houghton Mifflin.
42.
TermanL. M. (1926). Genetic studies of genius: Vol. I. Mental and physical traits of a thousand gifted children (2nd ed.). Stanford, CA: Stanford University Press.
43.
TermanL. M.MerrillM. A. (1973). Stanford-Binet Intelligence Scale: Manual for the third revised form L-M. Boston, MA: Houghton Mifflin.
44.
ThompsonL. A.OehlertJ. (2010). The etiology of giftedness. Learning and Individual Differences, 20, 298-307. doi: 10.1016/j.lindif.2009.11.004
45.
ThorndikeE. L.BregmanE. O.CobbM. V.WoodyardE. (1927). The measurement of intelligence. New York, NY: Teachers College, Columbia University.
46.
WaiJ.PutallazM. (2011). The Flynn effect puzzle: A 30-year examination from the right tail of the ability distribution provides some missing pieces. Intelligence, 39, 443-455. doi:10.1016/j.intell.2011.07.006
47.
WaiJ.PutallazM.MakelM. C. (2012). Studying intellectual outliers: Are there sex differences, and are the smart getting smarter?Current Directions in Psychological Science, 21, 382-390. doi:10.1177/0963721412455052
