Behavioral sink

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John B. Calhoun in one of his experimental colonies

The behavioral sink is a term coined by American ethologist and behavioral researcher John B. Calhoun, referring to an abrupt collapse in behavior resulting from overcrowding and abundance.[1][2] Calhoun conducted a series of experiments with mice and rats which are called mice utopia or rats paradise. Calhoun's theory was that overpopulation leads to social hierarchies where there was more demand for social roles than could be reasonably filled, and that this results in the emergence of "autistic-like creatures, capable only of the most simple behaviours compatible with physiological survival", intense social competition, and eventually the "breakdown of all normal social behavior".[3]

Description of the experiments[edit | edit source]

In Calhoun's experiments, rodent populations were kept in artificial, small environments with otherwise ideal conditions and unlimited food supply. In one of his experiments which was later once reproduced, the animals abruptly reproduced less and showed unhealthy social behavior after an initial phase of rapid population growth. This was primarily caused by male animals failing to claim territories of significant size, thus failing to claim dominance status and thus constantly engaging in fights. The lack of territory rendered most rodents incels. Some rodentcels alternatively became hypersexual, and either engaged in homosexual behaviors or incessantly chased female rodents in estrous (dubbed probers by Calhoun), in spite of being defeated and chased away by the dominant rodents. Some managed to follow the females into their burrows, eschewing the typical courtship rituals rodents engage in (intermittently poking their heads into the female's burrow until she accepts his advances). They often found neglected and dead young lying in the nests, which they frequently cannibalized.[4]

Frustrated with their inability to claim territory, other males began to evade fights altogether and instead engaged in excessive grooming behavior, possibly in attempt to distinguish themselves by looks, to make up for their lack of territory/status forcing them into inceldom. Being disappointed often enough, these vain males (dubbed the beautiful ones by Calhoun) eventually developed a complete disinterest in females, and could not relearn healthy sexual behavior even when separately paired with a female (learned helplessness). The few dominant rodents that remained, monopolized almost all breeding opportunities with the remaining females, maintaining harems by chasing away any lesser male who attempted to approach their territory, apart from a few subordinate males, who never attempted to mount the females in the dominant rodent's harem, and were therefore permitted to approach. Some male rodents also formed marauding gangs, attacking any female and young rodents that they came into proximity with.[5] Males engaged in sporadic acts of violence.

With the lack of territory normally established by males, the females also reproduced less, neglected their offspring and cared for their offspring on their own, partly overtaking male tasks of maintaining territory and demonstrating aggression. However, in the end pens, where the dominant rodents maintained harems, the female rodents often exhibited healthy nurturing behaviors, feeding, nesting and protecting their young from harm. Calhoun stated that this was due to the estrous females in such pens being protected from incessant and unwanted attention from the lower status males, particularly the hypersexual "probers" who obsessively stalked and approached any estrous female they could find, despite being repeatedly defeated and driven away by the dominant rodents. These "brood pens", exhibited the highest infant survival rate.

The experiments that resulted in such a behavioral sink ended in the extinction of the colony, due to all males and females having become uninterested in reproduction. However, the behavioral sink was not the outcome of all experiments, e.g. when food was supplied in a manner where it could be consumed in a way that did not tend to incite male competition.

Criticism[edit | edit source]

There is dispute about the degree to which the experiment has similarities to pathological behavior in dense human populations, with Calhoun being strongly criticized during his lifetime and afterwards for inferences regarding human social behavior and the effects of overpopulation he drew from his experiments.[6] There were at least two partial replications of the experiments, Kessler (1966) managed to achieve a concurrently high and stable population in his two similar experiments.[7] But there were some similarities in the deviant behavior (such as homosexuality and cannibalism) that was exhibited by the mice in Kessler's experiments, though there was a general continuance of reproductive activity among the mice in both experiments. Hammock (1971) also noted extensive behavioral pathology in his experiment with a difference strain of mice, though there was no population decline or collapse, nor were there any "beautiful ones" (though some mice did engage in excessive grooming behavior) or cases of dominant males forming and maintaining harems.[8] This suggested a innate biological mechanism that auto-regulated population growth among the mice in Hammock's experiment.

Calhoun has also been criticized[9] for failing to take in account any other explanations of the behavioral sink phenomena, such as disease pandemics leading to population decline or dysgenic breeding (such as inbreeding depression) among the mice leading to ultimately fatal mutational load among the mice, causing them to become so mutated and autistic they could no longer reproduce or engage in functional social behavior. It has been suggested the negative social consequences of deleterious mutations multiply in feedback loops (social epistasis amplification).[10][11][12][13]

See also[edit | edit source]

References[edit | edit source]



Biological essentialismTraditional conservatismFatalismBlackpillScientific BlackpillScientific Blackpill (Supplemental)Behavioral sinkHypergamyBeautyDominance hierarchyJ. D. UnwinSexual sublimationFemale subordination and submissiveness






It's over

Cope or ropeCopeLay down and rotInbreeding depressionOutbreeding depressionMutationAtavismReproductive successDemographics of inceldomCauses of inceldomAdverse effects of inceldom