Abstract：
:The existence of homosexuality in humans poses a problem for evolutionary theory. Exclusive male homosexuality has a catastrophic effect on reproduction and yet inherited factors appear to contribute to it. Previous attempts to resolve this conundrum are inconsistent with aspects of evolutionary theory. Additional limitations are as follows. Until recently, accounts of homosexuality have paid little attention to the probable existence of adaptive bisexuality in ancestral populations, from which further variations in sexual orientation may have evolved. Secondly, previous explanations have concentrated on the ancestral environment of two to three million years ago as the determinant of modern sexuality, when more recent influences are likely to have had considerable impact. I argue in favour of a longitudinal rather than cross-sectional model of the ancestral environment. Thirdly, they have often ignored the possibility of variable phenotypic expression, whereby those individuals with a genetic propensity for homosexuality exhibit different and adaptive qualities on most other occasions. It has been demonstrated in previous studies that homosexual men have superior linguistic skills compared to heterosexual men. This may be the result of an adaptive feminising effect on the male brain and apply to many practising heterosexuals. Other adaptations to the recent ancestral environment may include enhanced empathy, fine motor skills and impulse control. By drawing together these contributing factors an evolutionary basis for homosexuality can be demonstrated.
journal_name
Med Hypothesesjournal_title
Medical hypothesesauthors
Dewar CSdoi
10.1016/s0306-9877(02)00363-8keywords:
subject
Has Abstractpub_date
2003-02-01 00:00:00pages
225-32issue
2eissn
0306-9877issn
1532-2777pii
S0306987702003638journal_volume
60pub_type
杂志文章abstract：:The terminology relating to 'psychological stress' is so confused and ambiguous that research in this field - and application of its results - must surely be hampered. Relevant words with conflicting usages and scientific definitions include 'stress' itself, 'stressor', 'strain', 'challenge', 'demand', 'threat', 'reso...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2009.10.043
更新日期：2010-04-01 00:00:00
abstract：:Synthetic and semisynthetic fabrics generate electrostatic potentials on the surface of the skin. The author suggests that the effects of electrostatic potentials on physical and psychological condition are mediated by acupuncture points. The author further suggests that electrostatic charges on the surface of the ski...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.1999.0854
更新日期：2000-03-01 00:00:00
abstract：:A large number of epileptic patients suffer from refractory epilepsy, despite optimal treatment; thus these patients require new therapeutic approaches. Focal seizure activity is typically initiated in a fixed and localized region, which subsequently spreads to neighboring regions or more distant areas. At the initial...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2013.07.046
更新日期：2013-11-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2016.05.030
更新日期：2016-08-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2005.06.021
更新日期：2005-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2016.12.001
更新日期：2017-02-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(82)90084-6
更新日期：1982-10-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2015.05.009
更新日期：2015-09-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2007.01.084
更新日期：2007-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(81)90145-6
更新日期：1981-12-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(97)90223-1
更新日期：1997-08-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2017.12.019
更新日期：2018-02-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(92)90194-h
更新日期：1992-04-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 社论
doi：10.1016/j.mehy.2009.08.017
更新日期：2010-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 社论
doi：10.1016/j.mehy.2006.02.011
更新日期：2006-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(86)90036-8
更新日期：1986-12-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(93)90090-d
更新日期：1993-10-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2012.05.025
更新日期：2012-09-01 00:00:00
abstract：:A lowered risk of multiple sclerosis (MS) has been reported in the Hutterite community residing mainly in southern Canada. In another anabaptist community, the Old Colony Mennonites (OCM), settled in Canada and spread to Latin America, only a large pedigree with an increased risk of autoimmune diseases, including type...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2006.03.044
更新日期：2006-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1054/mehy.1998.0734
更新日期：1999-08-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2012.01.032
更新日期：2012-04-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2007.06.021
更新日期：2008-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.09.029
更新日期：2005-01-01 00:00:00
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journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(91)90229-r
更新日期：1991-07-01 00:00:00
abstract：:The concept of reentry as the most important element in a hypothesis for consciousness proposed by Edelman and Tononi is reviewed. Reentry, is a process of ongoing parallel and recursive signalling between separate neuronal groups along parallel reciprocally fibers that link these groups anatomically. Reentry alters t...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/j.mehy.2004.03.007
更新日期：2004-01-01 00:00:00
abstract：:Reconciling the early promising results of radiation therapy in the treatment of epilepsy with the recent theory concerning the role of nonsynaptic mechanisms in focal epileptogenesis, it is suggested that the potential of irradiation as an alternative to temporal lobe resection in intractable epilepsy should be re-ev...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(80)90102-4
更新日期：1980-05-01 00:00:00
abstract：:Organisms release their antigens into the environment. Some antigens are volatile and may pass into the blood of other organisms during respiration. Fetal antigens enter the mother's bloodstream through the placenta. Foreign antigens in the blood can cause various chemical changes and may initiate an immune reaction. ...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(95)90211-2
更新日期：1995-07-01 00:00:00
abstract：:Oxidative stress plays a crucial role in a variety of clinical settings of atherogenesis, and mediates many pathways linked to atherosclerosis and inflammation. gamma-Glutamyltransferase (GGT), an enzyme responsible for the extracellular catabolism of antioxidant glutathione, may directly take part in atherogenesis an...
journal_title：Medical hypotheses
pub_type： 杂志文章,评审
doi：10.1016/j.mehy.2006.04.010
更新日期：2006-01-01 00:00:00
abstract：:Superficial fraying, splitting and fibrillation of articular cartilage as a consequence of ageing or mechanical injury is not always associated with joint pain. However, similar cartilage lesions accompanied by synovitis and engorgement of the subchondral vasculature generally is; the disorder being known as osteoarth...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/0306-9877(93)90068-2
更新日期：1993-08-01 00:00:00
abstract：:Hypoplastic pineal glands and decreased melatonin levels are found in sudden infant death syndrome. Excess oxygen radical production and inadequate radical quenching is suggested to cause oxidative stress in the brain of sudden infant death syndrome victims. Loss of intraventricular cerebrospinal fluid melatonin could...
journal_title：Medical hypotheses
pub_type： 杂志文章
doi：10.1016/s0306-9877(97)90091-8
更新日期：1997-11-01 00:00:00
