Veränderungen weiblicher Partnerpräferenzen im Menstruationszyklus

Übersicht:

In der fruchtbaren Phase des Menstruationszyklus finden Frauen ausgeprägt maskuline Gesichtszüge, Körpermerkmale und Verhaltens­weisen besonders sexy und fühlen sich mehr als sonst von anderen Sexualpartnern als dem festen Partner angezogen. Zugleich verhalten sich feste Partner besonders aufmerksam und eifersüchtig. Die zyklusabhängige ­Bevorzugung maskuliner Merkmale ist besonders ausgeprägt, wenn der ­feste Partner solche Merkmale wenig besitzt. Dieses Muster kann durch ­eine evolutionspsychologische Theorie erklärt werden, die als „ovulatio­nary shift“ oder weibliche Doppelstrategie bezeichnet wird. Nach dieser Theorie konnten in der Evolu­tionsgeschichte Frauen ihren Reproduktionserfolg erhöhen, indem sie erstens einen guten Versorger fanden und zweitens einen Träger guter Gene als Vater ihrer Nachkommen. Ungebundene Partner, die beide Ideale erfüllten, waren nur für wenige Frauen erreichbar. Deshalb entstanden subtile Anpassungen, die in der Phase höchster Fruchtbarkeit die Wahl auf ­einen genetisch attraktiven Partner lenkten, der nicht unbedingt der feste Partner sein musste. Die Konzentration auf die fruchtbare Phase verringerte das Risiko, entdeckt zu werden und in einen Konflikt mit dem festen Partner zu geraten. Zahlreiche Befunde sprechen dafür, dass eine solche evolutionär entstandene Anpassung tatsächlich existiert, besonders Befunde, die eine indirekte Messung genetischer Qualität benutzen: die Abweichungen symmetrisch angelegter Körperteile von perfekter Symmetrie. Es bleiben ­allerdings Fragen, z. B. warum genetische Kompatibilität und Intelligenz anscheinend nicht zu den bevorzugten Merkmalen gehören und ob der Grund für die Bevorzugung maskuliner Merkmale ausschließlich in ihrer Hinweisfunktion auf gute Gene liegt. 

Schlüsselwörter:

Evolutionspsychologie - Menstruationszyklus - Ovulation - Partnerwahl - sexuelle Motivation - sexuelle Strategie

Literatur

• 1 Alexander R D, Noonan K M. Concealment of Ovulation, Parental Care and Human Social Evolu­tion.. In: Chagnon N A, Hrsg. Evolutionary Biology and Human Social Behavior. An Anthropological Perspective.. Massachusetts: North Scituate; 1979: 437-453
• 2 Arnqvist G, Lowe L. Sexual Conflict.. Princeton: Princeton University Press; 2005
• 3 Banks G C, Batchelora J H, McDaniel M A. Smarter People are (a bit) more Symmetrical: A Meta-Analysis of the Relationship Between Intelligence and Fluctuating Asymmetry.  Intelligence. 2010;  38 393-401
• 4 Brown W M, Cronk L, Grochow K EA. Dance Reveals Symmetry Especially in Young Men.  Nature. 2005;  438 1148-1150
• 5 Brown W M, Moore C. Fluctuating Asymmetry and Romantic Jealousy.  Evol Hum Behav. 2003;  24 113-117
• 6 Buss D, Larsen R J, Westen D, Semmelroth J. Sex Differences in Jealousy: Evolution, Physiology and Psychology.. In: Kenrick D T, Luce C L, Hrsg. The Functional Mind: Readings in Evolution­ary Psychology.. Boston: Pearson; 2004;: 280-288
• 7 Byers J A, Waits L. Good Genes Sexual Selection in Nature.  PNAS. 2006;  103 16343-16345
• 8 Cárdenas R A, Harris L J. Do Women’s Preferences for Symmetry Change Across the Menstrual ­Cycle?.  Evol Hum Behav. 2007;  28 96-105
• 9 Caryl P G, Bean J E, Smallwood E B, Barron J C, Tully L, Allerhand M. Women’s Preference for Male Pupil-Size: Effects of Conception Risk, Sociosexuality and Relationship Status.  Pers Indiv Differ. 2009;  46 503-508
• 10 Daly M, Wilson M. Sex, Evolution and Behaviour.. 2. Auflage. Boston: Willard Grant Press; 1983
• 11 Debruine L M, Jones B C, Frederick D A, Haselton M G, Penton-Voak I S, Perret D I. Evidence for Menstrual Cycle Shifts in Women’s Preferences for Masculinity: A Response to Harris “Menstrual Cycle and Facial Preferences Reconsidered”.  Evol Psychol. 2010;  8 768-775
• 12 Double M, Cockburn A. Pre-Dawn Infidelity: Females Control Extra-Pair Mating in Superb Fairy-Wrens.  Proc R Soc Lond B. 2000;  267 465-470
• 13 Dreher J C, Schmift P. Menstrual Cycle Phase Modulates Reward-Related Neural Function in Wom­en.  PNAS. 2007;  104 2465-2470
• 14 Erickson M T. Rethinking Oedipus: An Evolutionary Perspective of Incest Avoidance.  Am J Psychiatry. 1993;  150 411-416
• 15 Feinberg D R, Jones B C, Law Smith M J, Moore F R, DeBruine L M, Cornwell R E. Menstrual Cycle, Trait Estrogen Level, and Masculinity Preferences in the Human Voice.  Horm Behav. 2006;  49 215-222
• 16 Fessler D MT, Navarrete C D. Domain-Specific Variation in Disgust Sensitivity Across the Men­strual Cycle.  Evol Hum Behav. 2003;  24 406-417
• 17 Fink B, Penton-Voak I S. Evolutionary Psychology of Facial Attractiveness.  Curr Dir Psychol Sci. 2002;  11 154-158
• 18 Fink B, Sövegjarto O. Physische Attraktivität und Zyklusabhängige Partnerpräferenzen.  Der Gynäkologe. 2007;  40 729-736
• 19 Folstad I, Karter A J. Parasites, Bright Males, and the Immunocompetence Handicap.  Am Nat. 1991;  139 603-622
• 20 Franzen J. Freiheit.. Reinbek: Rowohlt; 2010
• 21 Gangestad S W, Simpson J A. The Evolution of Human Mating: The Role of Trade-Offs and Stra­tegic Pluralism.  Behav Brain Sci. 2000;  23 675-687
• 22 Gangestad S W, Simpson J A, Cousins A J. Women’s Preferences for Male Behavioral Displays Change Across the Menstrual Cycle.  Psychol Sci. 2004;  15 203-207
• 23 Gangestad S W, Thornhill R. Menstrual Cycle Variation in Women’s Preferences for the Scent of Symmetrical Men.  Proc R Soc Lond B. 1998;  265 927-933
• 24 Gangestad S W, Thornhill R. Facial Masculinity and Fluctuating Asymmetry.  Evol Hum Behav. 2003;  24 231-241
• 25 Gangestad S W, Thornhill R. Female Multiple Mating and Genetic Benefits in Humans: Investigations of Design.. In: Kappeler P M, van Schaik C P, Hrsg. Sexual Selection in Primates: New and Comparative Perspectives.. Cambridge, England: Cambridge University Press; 2004
• 26 Gangestad S W, Thornhill R. Human Oestrus.  Proc R Soc Lond B. 2008;  275 991-1000
• 27 Gangestad S W, Thornhill R. Fertility in the Cycle Predicts Women’s Interest in Sexual Oppor­tun­ism.  Evol Hum Behav. 2010;  31 400-411
• 28 Gangestad S W, Thornhill R, Garver-Apgar C E. Changes in Women’s Sexual Interests and Their Partners’ Mate-Retention Tactics Across the Menstrual Cycle: Evidence for Shifting Conflicts of Interest.  Proc R Soc Lond B. 2002;  269 975-982
• 29 Gangestad S W, Thornhill R, Garver-Apgar C E. Adaptations to Ovulation.. In: Buss D, Hrsg. The Handbook of Evolutionary Psychology.. Hoboken: New Jersey: Wiley; 2005 a: 344-371
• 30 Gangestad S W, Thornhill R, Garver-Apgar CE: Adaptations to O vulation. Implications for Sexual and Social Behavior.  Current Directions in Psychological Science. 2005 b;  14 312-316
• 31 Gangestad S W, Thornhill R, Garver-Apgar C E. Women’s Sexual Interests Across the Ovulatory Cycle Depend On Primary Partner Developmental Instability.  Proc R Soc Lond B. 2005c;  272 2023-2027
• 32 Gangestad S W, Thornhill R, Garver-Apgar C E. Men’s Facial Masculinity Predicts Changes in Their Female Partner’s Sexual Interest Across the Ovulatory Cycle, Whereas Men’s Intelligences Does Not.  Evol Hum Behav. 2010;  31 412-424
• 33 Garver-Apgar C E, Gangestad S W, Thornhill R, Miller R, Olp J. Major Histocompatibility Complex Alleles, Sexual Responsivity, and Unfaithfulness in Romantic Couples.  Psychological Sci. 2006;  17 830-835
• 34 Garver-Apgar C E, Gangestad S W, Thornhill R. Hormonal Correlates of Women’s Mid-Cycle Preference for the Scent of Symmetry.  Evol Hum Behav. 2008;  29 223-232
• 35 Geher G, Miller G. Mating Intelligence. Sex, Relationships, and the Mind’s Reproductive System.. Lawrence: Erlbaum; 2008
• 36 Gowaty P A. Battles of the Sexes and Origins of Monogamy.. In: Black J M, Hrsg. Partnership in Birds: The Study of Monogamy.. Oxford: Oxford University Press; 1996: 21-52
• 37 Grammer K. 5-A-Androst-16en-3a-On: A Male Pheromone? A Bief Report.  Ethol Sociobiol. 1993;  14 201-207
• 38 Grammer K. Disco Clothing, Female Sexual Motivation, and Relationship Status: Is She Dressed to Impress?.  J Sex Res. 2004;  41 66-74
• 39 Gray P, Kahlenberg S M, Barrett E S, Lipson E F, Ellison P T. Marriage and Fatherhood Are Assso­ciated With Lower Testosterone in Males.  Evol Hum Behav. 2002;  23 193-202
• 40 Gueguen N. The Receptivity of Women to Courtship Solicitation Across the Menstrual Cycle: A Field Experiment.  Biol Psychol. 2009;  80 321-324
• 41 Harris C R. Menstrual Cycle and Facial Preferences Reconsidered.  Sex Roles. 2010;  DOI: 10.1007/s11199-010-9772-8
• 42 Haselton M G, Gangestad S W. Conditional Expression of Women’s Desires and Men’s Mate Guard­ing Across the Ovulatory Cycle.  Horm Behav. 2006;  49 509-518
• 43 Haselton M G, Miller G F. Women’s Fertility Across the Cycle Increases the Short-Term Attractiveness of Creative Intelligence.  Hum Nature. 2004;  17 50-73
• 44 Haselton M G, Mortezaie M, Pillsworth E G. Ovulatory Shifts in Human Female Ornamentation: Near Ovulation, Women Dress to Impress.  Horm Behav. 2007;  51 40-45
• 45 Havliček J, Dvôràkovà R, BartoÅ¡ L, Flegr J. Non-Advertized Does Not Mean Concealed: Body Odour Changes Across the Human Menstrual Cycle.  Ethology. 2006;  112 81-90
• 46 Havliček J, Roberts S C. MHC-Correlated Mate Choice in Humans: A Review.  Psychoneuroendo­crino. 2009;  34 497-512
• 47 Havliček J, Roberts S C, Flegr J. Women’s Preference for Dominant Male Odour: Effects of Men­strual Cycle and Relationship Status.  Biol Letters. 2005;  1 256-259
• 48 Head M L, Hunt J, Jennions M D, Brooks R. The Indirect Benefits of Mating With Attractive Males Outweigh the Direct Costs.  PLoS ONE. 2005;  3 289-294
• 49 Hughes S M, Harrison M A, Gallup G G. The Sound of Symmetry: Voice As a Marker of Developmental Stability.  Evol Hum Behav. 2003;  23 173-180
• 50 Jennions M D, Petrie M. Why Do Female Mate Multiply? A Review of the Genetic Benefits.  Biol Rev Camb Philos. 2000;  75 21-64
• 51 Johnsen A, Andersen V. Female Bluethroats Enhance Offspring Immunocompetence Through ­Extra-Pair Copulations.  Nature. 2000;  406 296-299
• 52 Johnston V S, Hagel R, Franklin M, Fink B, Grammer K. Male Facial Attractiveness. Evidence for Hormone-Mediated Adaptive Design.  Evol Hum Behav. 2001;  22 251-267
• 53 Jones B C, Debruine L M, Perrett D I, Little A C, Feinberg D R, Smith M JL. Effects of Menstrual Cycle Phase On Face Preferences.  Arch Sex Behav. 2008;  37 78-84
• 54 Jones B C, Little A C, Boothroyd L G, Debruine L M, Feinberg D R, Law Smith M J, Cornwell R E, Moore F R, Perrett D I. Commitment to Relationships and Preferences for Feminity and Apparent ­Health in Faces are Strongest on Days of the Mentrual Cycle when Progesterone Level is High.  Horm Behav. 2005 a;  48 283-290
• 55 Jones B C, Little A C, Feinberg D R, Penton-Voak I S, Tiddeman B P, Perrett D I. The Relationship be­tween Shape Symmetry and Perceived Skin Condition in Male Facial Attractiveness.  Evol Hum Behav. 2004;  25 24-30
• 56 Jones B C, Perrett D I, Little A C, Boothroyd L, Cornwell R E, Feinberg D R, Tiddeman B P, Whiten S, Pitman R M, Hillier S G, Burt D M, Stirrat M R, Law Smith M J, Moore F R. Menstrual Cycle, Pregnancy and Oral Contraceptive Use Alter Attraction to Apparent Health in Faces.  Proc R Soc Lond B. 2005 b;  272 347-354
• 57 Knott C D, Thompson M E, Stumpf R M, McIntyre M H. Female Reproductive Strategies in Orangutans, Evidence for Female Choice and Counterstrategies to Infanticide in a Species With Frequent Sexual Coercion.  Proc R Soc Lond B. 2010;  277 105-113
• 58 Koehler N, Rhodes G, Simmons L W. Are Human Female Preferences for Symmetrical Male Faces Enhanced when Conception is Likely?.  Anim Behav. 2002;  64 233-238
• 59 Kowner R. Psychological Perspective On Human Developmental Stability and Fluctuating Asymmetry: Sources, Applications and Implications.  Br J Psychol. 2001;  92 447-469
• 60 Krug R, Moelle M, Fehm H L. Variations Across the Menstrual Cycle in EEG Activity During Thinking and Relaxation.  J Pschophysiol. 1999;  13 162-172
• 61 Law Smith M J, Perrett D I, Jones B C, Cornwell R E, Moore F R, Feinberg D R, Boothroyd L G, Durrani S J, Stirrat M R, Whiten S, Pitman R M, Hillier S G. Facial Appearance is a Cue to Oestrogen Lev­els in Women.  Proc R Soc Lond B. 2006;  273 135-140
• 62 Lieberman D, Tooby J, Cosmides L. The Architecture of Human Kin Detection.  Nature. 2007;  445 727-731
• 63 Lifjeld J T, Slagsvold T. Mate Fidelity of Renesting Pied Flycatchers Ficedula Hypoleuca in Relation to Characteristics of the Pair Mates.  Behav Ecol Sociobiol. 1988;  22 117-123
• 64 Little A C, Jones B C, Burriss R P. Preferences for Masculinity in Male Bodies Change Across the Menstrual Cycle.  Horm Behav. 2007 a;  51 633-639
• 65 Little A C, Jones B C, Burt D M, Perret D I. Preferences for Symmetry in Faces Change Across the Menstrual Cycle.  Biol Psychol. 2007 b;  76 209-216
• 66 Little A C, Jones B C, Penton-Voak I, Burt D M, Perrett D I. Partnership Status and the Temporal Context of Relationships Influence Human Female Preferences for Sexual Dimorphism in Male Face Shape.  Proc R Soc Lond B. 2002;  269 1095-1100
• 67 Luxen M F, Buuk B P. Human Intelligence, Fluctuating Asymmetry and the Peacock’s Tail – Gen­eral Intelligence (G) As An Honest Signal of Fitness.  Pers Indiv Diff. 2006;  41 897-902
• 68 Marlowe W F. Paternal Investment and the Human Mating System.  Behav Proc. 2000;  51 45-61
• 69 Maß R, Bauer R, Wolf K. Zyklusabhängigkeit mimischer Reaktionen auf erotische Bilder.  Z Se­xual­forsch. 2008;  21 76-88
• 70 Maynard Smith J. Fertility, Mating Behaviour and Sexual Selection in Drosophila Subobscura.  J Genet. 1956;  53 295-314
• 71 Mazur A, Booth A. Testosterone and Dominance in Men.  Behav Brain Sci. 1998;  21 353-397
• 72 Miller G, Tybur J M, Jordan B D. Ovulatory Cycle Effects On Tip Earnings By Lap Dancers: Eco­nomic Evidence for Human Estrus?.  Evol Hum Behav. 2007;  28 375-381
• 73 Miller G F. Sexual Selection for Indicators of Intelligence.. In: Bock G, Goode J A, Webb K, Hrsg. The Nature of Intelligence.. Chichester: Wiley; 2000 a: 260-280
• 74 Miller G F. The Mating Mind: How Sexual Choice Shaped the Evolution of Human Nature.. New York: Doubleday; 2000 b
• 75 Moller A P. Frequency of Female Copulations with Multiple Males and Sexual Selection.  Am Nat. 1992;  139 1089-1101
• 76 Moller A P. The Evolution of Monogamy: Mating Relationships, Parental Care and Sexual Selec­tion.. In: Reichard U H, Boesch C, Hrsg. Monogamy: Mating Strategies and Partnerships in Birds, Humans and Other Mammals.. Cambridge: Cambridge University; 2003: 29-41
• 77 Moller A P, Alatalo R V. Good-Genes Effects in Sexual Selection.  Proc R Soc Lond B. 1998;  266 85-91
• 78 Møller A P, Swaddle J P. Asymmetry, Developmental Stability, and Evolution.. Oxford: University Press; 1997
• 79 Pawlowski B, Jasienska G. Women’s Preferences for Sexual Dimorphism in Height Depend On Menstrual Cycle Phase and Expected Duration of Relationship.  Biol Psychol. 2005;  70 38-43
• 80 Penton-Voak I S, Perret D I. Female Preference for Male Faces Changes Cyclically: Further Evidence.  Evol Hum Behav. 2000;  21 39-48
• 81 Penton-Voak I S, Perrett D I, Castles D L, Kobayashi T, Burt D M, Murray L K, Minamisawa R. Men­strual Cycle Alters Face Preference.  Nature. 1999;  399 741-742
• 82 Perrett D I, Lee K J, Penton-Voak I, Rowland D, Yoshikawa S, Burt D M, Henzik S P, Castles D L, Akamatsu S. Effects of Sexual Dimorphism On Facial Attractiveness.  Nature. 1998;  349 884-887
• 83 Pertoldi C, Kristensen T N, Andersen D H, Loeschcke V. Developmental Instability as an Estimator of Genetic Stress.  Heredity. 2006;  96 122-127
• 84 Peters M, Simmons L W, Rhodes G. Preferences across the Menstrual Cycle for Masculinity and Symmetry in Photographs of Male Faces and Bodies.  PLoS ONE. 2009;  4 1-7
• 85 Petrie M. Improved Growth and Survival of Offspring of Peacocks With More Elaborate Tails.  Nature. 1994;  371 598-599
• 86 Pillsworth E G, Haselton M G. Male Sexual Attractiveness Predicts Differental Ovulatory Shifts in Female Extra-Pair Attraction and Mate Retention.  Evol Hum Behav. 2006;  27 247-258
• 87 Pillsworth E G, Haselton M G, Buss D M. Ovulatory Shifts in Female Sexual Desire.  J Sex Res. 2004;  41 55-65
• 88 Pomiankowski A. The Evolution of Female Mate Preferences for Male Genetic Quality.. In: Partridge H P, Hrsg. Oxford Surveys in Evolutionary Biology.. Oxford: Oxford University Press; 1988: 136-184
• 89 Pomiankowski A. Mutation, Selection and the Heritability of Complex Traits.. In: Novartis Foundation, Hrsg. The Nature of Intelligence.. Chichester: Wiley; 2000: 228-242
• 90 Pound N, Penton-Voak I S, Surridge A K. Testosterone Responses to Competition in Men are Re­lated to Facial Masculinity.  Proc R Soc Lond B. 2009;  276 153-159
• 91 Prokosch M D, Coss R G, Scheib J E, Blozis S A. Intelligence and Mate Choice: Intelligent Men are always Appealing.  Evol Hum Behav. 2009;  30 11-20
• 92 Puts D A. Mating Context and Menstrual Phase Affect Women’s Preferences for Male Voice Pitch.  Evol Hum Behav. 2005;  26 388-397
• 93 Rasmuson M. Fluctuating Asymmetry – Indicator of What?.  Hereditas. 2002;  136 177-183
• 94 Rhodes G, Chan J, Zebrowitz L A, Simmons L W. Does Sexual Dimorphism in Human Faces Signal Health?.  Proc R Soc Lond B. 2003;  270 93-95
• 95 Rikowski A, Grammer K. Human Body Odour, Symmetry and Attractiveness.  Proc R Soc Lond B. 1999;  266 869-874
• 96 Roberts S C, Havlicek J, Flegr J, Hruskova M, Little A C, Jones B C, Perrett D I, Petrie M M. Female Facial Attractiveness Increases During the Fertile Phase of the Menstrual Cycle.  Proc R Soc Lond B. 2004 a;  271 270-272
• 97 Roberts S C, Little A C. Good Genes, Complementary Genes and Human Mate Preferences.  Genetica. 2008;  132 309-321
• 98 Roberts S C, Little A C, Gosling L M, Jones B C, Perrett D I, Carter V, Petrie M. MHC-Assortative Facial Preferences in Humans.  Biol Lett. 2005;  1 400-403
• 99 Roney J R, Hanson K N, Durante K M, Maestripieri D. Reading Men’s Faces: Women’s Mate Attrac­tiveness Judgments Track Men’s Testosterone and Interest in Infants.  Proc R Soc Lond B. 2006;  273 2169-2175
• 100 Schaefer K, Fink B, Grammer K, Mitteroecker P, Gunz P, Bookstein F L. Female Appearance: Facial and Bodily Attractiveness as Shape.  Psychol Sci. 2006;  48 187-204
• 101 Schwarz S, Hassebrauck M. Indirekte Methoden zur Bestimmung der weiblichen Fertilität – ein Beitrag zur Methodologie einer evolutionären (Sozial-) Psychologie.. In: Witte E H, Hrsg. Evolutionäre Sozialpsychologie und automatische Prozesse.. Lengerich: Pabst Science Publishers; 2006: 95-113
• 102 Schwarz S, Hassebrauck M. Self-Perceived and Observed Variations in Women’s Attractiveness Throughout the Menstrual Cycle: A Diary Study.  Evol Hum Behav. 2008;  29 282-288
• 103 Sievert L L, Dubois C A. Validating Signals of Ovulation: Do Women Who Think They Know, Really Know?.  Am J Hum Biol. 2005;  17 310-320
• 104 Singh D, Bronstad M P. Female Body Odour is a Potential Cue to Ovulation.  Proc R Soc Lond B. 2001;  268 797-801
• 105 Swaddle J P, Reierson G W. Testosterone Increases Perceived Dominance But Not Attractiveness in Human Males.  Proc R Soc Lond B. 2010;  269 2285-2289
• 106 Thiessen D. Environmental Tracking By Females.  Hum Nature. 1994;  5 167-202
• 107 Thornhill R. Major Histocompatibility Complex Genes, Symmetry, and Body Scent Attractiveness in Men and Women.  Behav Ecology. 2003;  14 668-678
• 108 Thornhill R, Gangestad S. The Evolutionary Biology of Human Female Sexuality.. Oxford: University Press; 2008
• 109 Thornhill R, Gangestad S W. Human Female Copulatory Orgasm: A Human Adaptation or Phylogenetic Holdover.  Anim Behav. 1996;  52 853-855
• 110 Thornhill R, Gangestad S W. The Scent of Symmetry: A Human Sex Pheromone that Signals Fitness?.  Evol Hum Behav. 1999;  20 175-201
• 111 Thornhill R, Gangestad S W, Comer R. Human Female Orgasm and Mate Fluctuating Asymmetry.  Anim Behav. 1995;  50 1601-1615
• 112 Trivers R, Palestis B G, Zaatari D. The Anatomy of a Fraud: Symmetry and Dance.. TPZ Publishers; 2009
• 113 Wilcox A J, Baird B D, Dunson D B, Mcconnaughey D R, Kesner J S, Weinberg C R. On the Frequency of Intercourse around Ovulation: Evidence for Biological Influence.  Hum Reprod. 2004;  19 1539-1543
• 114 Wilson T D. Strangers to Ourselves. Discovering the Adaptive Unconscious.. Cambridge: The Belknap Press of Harvard University Press; 2002
• 115 Yeo R A, Gangestad S W, Liu J, Calhoun V D, Hutchinson K E. Rare Copy Number Deletions Predict Individual Variation in Intelligence.  PLoS ONE. 2011;  6 e16339 DOI: 10.1371/journal.pone.0016339
• 116 Zahavi A. The Handicap Principle. A Missing Piece of Darwin’s Puzzle.. Oxford: University Press; 1997