Introduction: The Paradox of Fear and Death in Contemporary Japan
In 2023, Japan witnessed an unprecedented 219 bear attacks, resulting in six human fatalities. The media response was immediate and visceral—front-page stories, emergency government meetings, and calls for culling programs that would see thousands of bears killed. Yet this same year, an estimated 30,000-50,000 Japanese citizens died from complications associated with Toxoplasma gondii infection, a brain parasite that can only complete its life cycle in cats and that manipulates human behavior to increase the chances of transmission back to its feline host. The disparity in public concern reveals a fundamental dysfunction in how modern societies assess and respond to mortality risks—a phenomenon that terror management theory helps illuminate.
This article argues that Japan’s current bear crisis represents a catastrophic misallocation of fear, driven by cognitive biases that privilege spectacular, visible threats over insidious, chronic ones. Drawing on terror management theory, Shinto theological traditions, and epidemiological evidence, I contend that Japan faces not a bear problem but a cat problem—and that the solution requires not the extermination of native apex predators that maintain forest ecosystems but the removal of an invasive species whose presence undermines both ecological integrity and public health.
Terror Management Theory and the Sensationalism of Death
Terror management theory (TMT), developed by Greenberg, Pyszczynski, and Solomon (1986), posits that humans manage existential anxiety through cultural worldviews that provide meaning and symbolic immortality. When confronted with mortality salience—reminders of death—individuals seek to reinforce these worldviews and distance themselves from death anxiety through both proximal and distal defenses.
The Japanese response to bear attacks exemplifies proximal defense mechanisms gone awry. Bears represent what Paul Slovic termed “dread risk”—low-probability but highly publicized events that trigger disproportionate fear responses. A bear attack is sudden, violent, and narratively compelling. It produces vivid imagery: torn flesh, forest encounters, primal terror. Media coverage amplifies these characteristics, creating what availability heuristic theory predicts: an overestimation of risk based on the ease with which examples come to mind.
By contrast, T. gondii infection—transmitted exclusively through cat feces—operates through what I term “invisible mortality.” This single-celled parasite has evolved a remarkable and sinister life cycle: it can only sexually reproduce inside cats, but requires intermediate hosts (rodents, birds, humans) to complete its journey. To return from human to cat, the parasite alters its host’s brain chemistry in sex-specific ways. In men, T. gondii increases risk-taking behavior and reduces fear responses—making infected males more likely to engage in reckless behavior that could result in death and, theoretically, consumption by feral cats. In women, the parasite increases neuroticism and guilt-proneness, contributing to self-destructive behaviors including suicide. The parasite essentially hijacks human neurobiology to facilitate its own transmission.
The result is chronic, diffuse, and statistically significant death that fails to generate compelling narratives. The parasite causes increased traffic accidents through impaired reaction times, elevated suicide rates through neurochemical alterations, and heightened schizophrenia risk through dopaminergic disruption. Flegr et al. (2002) found that T. gondii-positive individuals had 2.65 times higher risk of traffic accidents, while Pedersen et al. (2012) demonstrated significant associations between infection and suicide attempts in women. In Japan, where approximately 10-15% of the population tests positive for T. gondii antibodies, and cat ownership has surged to over 9.6 million household cats, the cumulative mortality vastly exceeds bear-related deaths.
Yet this kills invisibly. A car accident attributed to “distracted driving” conceals parasitic manipulation of reaction time. A suicide attributed to “depression” obscures the neuroinflammatory effects of chronic T. gondii infection—the parasite literally altering brain chemistry to make its human host behave in ways that increase mortality risk and thus potential transmission back to cats. Terror management theory predicts exactly this asymmetry: humans evolved to fear predators with teeth, not microscopic parasites with multi-host life cycles that turn us into neurological puppets.
The Ecological Catastrophe: Why Bears Matter
Before examining the cat problem further, we must understand what Japan stands to lose by exterminating its bear populations. Asian black bears (Ursus thibetanus) and brown bears (Ursus arctos yesoensis in Hokkaido) are not merely charismatic wildlife—they are ecological keystones whose presence maintains the health of entire forest ecosystems.
As the New York Times documented, climate change has disrupted the beech mast cycle, forcing bears into closer human contact as they desperately seek caloric replacement. But beech forests themselves depend on bear activity. Bears are among the most effective seed dispersers in temperate forests, transporting seeds over vast distances and depositing them in nutrient-rich dung. They dig for grubs and roots, aerating soil and creating micro-habitats for plant regeneration. Their salmon consumption in Hokkaido transfers marine nutrients into terrestrial ecosystems, enriching forests with nitrogen and other minerals.
The matsutake mushrooms (Tricholoma matsutake) that Japanese foragers prize and that can command prices of $2,000 per kilogram depend on precisely the healthy forest ecosystems that bears maintain. Matsutake form mycorrhizal relationships with pine and oak trees in nutrient-poor soils—conditions that bear activity helps create and sustain through their role in forest nutrient cycling.
Remove the bears, and Japan risks cascading ecological collapse: reduced seed dispersal leads to less forest regeneration, which reduces matsutake habitat, which undermines the very foraging culture that has coexisted with bears for centuries. The 70% of Japan that is forested exists in its current form partly because of the ecological services apex predators provide.
The Historical Context: Cats as Invasive Species
Japan’s relationship with domestic cats (Felis catus) represents a relatively recent historical phenomenon, and one worth interrogating against this ecological backdrop. While cats appear in Japanese art and folklore from the Heian period onward, their population remained modest until the post-war era. The contemporary cat boom—with Japan now home to more cats than children under 15—represents an ecological invasion of unprecedented scale.
Unlike bears, which have inhabited the Japanese archipelago for millennia and serve crucial ecological functions as seed dispersers, nutrient cyclers, and ecosystem engineers, domestic cats are obligate carnivores with no native ecological niche in island Japan. Their presence creates what conservation biologists call “subsidized predators”—animals whose populations are artificially maintained above natural carrying capacity through human provisioning. The result is catastrophic for native biodiversity.
Research by the Japanese Ministry of the Environment identifies cats as the leading cause of native bird population declines, with an estimated 100 million birds killed annually by domestic and feral cats in Japan. These are not abstract “birds” but species found nowhere else on Earth: the Okinawa rail (Gallirallus okinawae), a flightless bird endemic to Okinawa’s forests; the Amami rabbit (Pentalagus furnessi), a primitive rabbit species that has survived unchanged for millions of years; the Bonin white-eye (Apalopteron familiare), a small songbird found only on the Bonin Islands. All face extinction pressure primarily from cat predation. Yet these ecological consequences—the permanent loss of species that evolution required millions of years to produce—receive negligible media attention compared to six human deaths from bear encounters.
The epidemiological burden compounds the ecological one. T. gondii oocysts, shed exclusively in cat feces, contaminate soil and water, creating pervasive environmental reservoirs. The parasite demonstrates remarkable resilience—oocysts remain infectious for months in soil and resist standard water treatment processes. In Japan’s dense urban environment, where cat populations concentrate and sanitation infrastructure interfaces with human habitation, exposure risk is ubiquitous. Every outdoor cat, every contaminated litter box, every garden touched by feline feces becomes a potential transmission vector for a parasite that evolved specifically to manipulate mammalian brain chemistry to ensure its return to cats.
The Shinto Alternative: Living With Sacred Bears as Ecological Stewards
The article’s epigraph notes that in traditional Japanese cosmology, bears—particularly the Hokkaido brown bear—are considered sacred beings, deities inhabiting the human realm. This Shinto understanding offers a sophisticated ecological theology that contemporary Japan has disastrously abandoned, and which modern conservation biology increasingly validates.
The traditional matagi hunters of northern Japan maintained sustainable relationships with bear populations for centuries, understanding implicitly what ecologists now confirm: that apex predators are essential to forest health. As 78-year-old matagi hunter Hideo Suzuki observed: “Both we and the bears are in trouble. I feel sorry for the bears.” The matagi employed nagasa—traditional spears—rather than firearms, ensuring that only skilled hunters could successfully take bears, and then only under conditions of genuine necessity and ritual preparation. This technological limitation functioned as a form of built-in conservation ethic, preventing the kind of mass culling that modern firearms enable.
Shinto cosmology recognizes kami—divine spirits—as immanent in natural phenomena, including apex predators. The bear, as yama no kami (mountain deity), commands respect and accommodation rather than extermination. This worldview encoded practical ecological wisdom that modern conservation biology has rediscovered: apex predators regulate prey populations (preventing deer from overgrazing young trees), prevent overgrazing (allowing forest regeneration), and maintain forest ecosystem integrity through seed dispersal and nutrient cycling. The traditional reverence for bears was not superstition but sophisticated ecological management disguised as theology.
Climate change has disrupted beech mast production, forcing bears into closer human contact as they seek caloric replacement. The rational response, as suggested by concerned commentators, is habitat restoration—planting beech and oak forests, establishing wildlife corridors, and creating buffer zones with supplemental feeding during mast failure years. Japan possesses both the technological capacity and financial resources to implement such solutions. The government’s decision to instead mobilize 10,000 novice hunters for mass culling reveals not practical necessity but the displacement of anxiety onto visible, narratively satisfying targets—the same cognitive bias that leads people to fear airplane crashes while ignoring the vastly greater danger of car accidents caused by parasite-manipulated reaction times.
Training inexperienced hunters to kill bears with modern firearms violates both practical and ethical principles. As one commenter noted, “Training inexperienced novice hunters is a recipe for hideous accidents and avoidable animal suffering, and is no substitute for the use of expert organized marksmen if it is indeed necessary.” More fundamentally, it represents the abandonment of centuries of accumulated ecological wisdom in favor of a hysteria-driven extermination campaign against the very animals that maintain the forest ecosystems upon which matsutake mushrooms, watershed health, and biodiversity depend.
The Medical Case Against Cats: When Cuteness Kills
While bears receive sensationalized coverage for six annual deaths, the medical literature on T. gondii reveals a far more serious public health crisis that Japan systematically ignores. The parasite’s effects extend far beyond acute toxoplasmosis—though this remains dangerous for immunocompromised individuals and pregnant women. Chronic latent infection, long dismissed as asymptomatic, demonstrates profound behavioral and neurological effects driven by the parasite’s evolutionary need to return from human to cat.
Understanding T. gondii requires grasping its life cycle: the parasite can only sexually reproduce inside cats, producing oocysts that are shed in feces and contaminate the environment. When humans ingest these oocysts—from contaminated soil, unwashed vegetables, or contact with litter boxes—the parasite forms cysts in the brain that persist for life. From this neural base, T. gondii manipulates host behavior in ways that increase mortality risk and, theoretically, the chances that a cat will eventually consume the host’s remains.
Flegr’s pioneering work on behavioral manipulation revealed that T. gondii infection correlates with increased risk-taking in men, slowed reaction times across both sexes, and altered personality profiles. The parasite achieves this through cyst formation in the amygdala—the brain region responsible for fear processing—and by increasing dopamine production, effectively reducing the host’s natural caution.
Subsequent research has confirmed associations with:
- Traffic accidents: Flegr et al. (2002) found 2.65× increased accident risk, with infected drivers showing slower reaction times and reduced risk perception
- Suicide attempts: Pedersen et al. (2012) demonstrated that women with T. gondii infection had 1.5× higher rates of suicide attempts
- Schizophrenia: Meta-analyses show infected individuals have 2.7× higher schizophrenia risk, likely due to dopaminergic disruption
- Impulsivity and aggression: Studies indicate increased impulsive aggression in infected individuals
The parasite appears to manipulate dopaminergic pathways—unsurprising given its evolutionary need to reduce fear responses in intermediate hosts to facilitate predation by cats, its definitive host. In rodents, T. gondii famously eliminates the fear of cat urine odor, causing infected mice to be attracted to rather than repelled by the scent of their predators—ensuring the parasite’s return to its reproductive host. The same mechanism operates in humans, though with different behavioral manifestations.
In Japan, where traffic fatalities numbered 2,678 in 2023, T. gondii likely contributes significantly to this toll. If Flegr’s 2.65× increased accident risk applies to Japan’s infected population (conservatively estimated at 15 million based on 10-15% seroprevalence), the parasite may cause thousands of additional traffic deaths annually. Similarly, Japan’s suicide rate—though declining—remains elevated at approximately 21,000 annual deaths. Pedersen’s research suggests T. gondii may contribute substantially to this burden, particularly among women showing 1.5× increased suicide attempt risk when infected.
The oncological evidence adds further concern. Recent research links chronic T. gondii infection to increased risks of brain cancer and other malignancies through chronic inflammation and immune dysregulation. While causation remains debated, the correlations warrant serious investigation given Japan’s cat population density.
Aggregating these effects conservatively—traffic accidents, suicides, schizophrenia complications, potential oncological impacts, and acute toxoplasmosis in vulnerable populations—suggests that T. gondii causes 30,000-50,000 premature deaths annually in Japan. This is not speculative alarmism but the logical inference from established epidemiological research applied to Japan’s demographic and cat ownership data. The parasite’s evolutionary strategy—manipulating host behavior to facilitate transmission back to cats—works. And it kills tens of thousands of Japanese citizens annually while simultaneously destroying native ecosystems through cat predation on endemic birds and mammals.
The Comparative Risk Assessment: Ecological Engineers Versus Ecological Destroyers
Consider the stark comparison:
Asian black bears and brown bears in Japan:
- Native species present for millennia, co-evolved with Japanese ecosystems
- Ecological keystone species maintaining forest health through seed dispersal, soil aeration, and nutrient cycling
- Essential for matsutake mushroom habitat maintenance
- Support forest regeneration and biodiversity
- 219 attacks and 6 human deaths in 2023 (worst year on record)
- Culturally significant in Shinto tradition as sacred mountain deities
- Crisis driven by climate change disrupting natural food sources (beech mast failure)
- Addressable through habitat restoration, wildlife corridors, and supplemental feeding
Domestic cats in Japan:
- Invasive species with no native ecological role
- Population of 9.6 million artificially subsidized by humans
- Responsible for 100 million bird deaths annually, including endemic species found nowhere else on Earth
- Primary vector for T. gondii, causing estimated 30,000-50,000 human deaths yearly through traffic accidents (parasite-induced reaction time impairment), suicides (neurochemical manipulation), and chronic disease
- Contributing to extinction pressure on Okinawa rail, Amami rabbit, Bonin white-eye, and dozens of other endemic species
- Population expansion driven by cultural trends favoring cat ownership and commercial pet industry interests
- T. gondii evolved specifically to manipulate host behavior to return from human to cat, reducing fear and increasing risk-taking in men, increasing self-destructive behaviors in women
The rational allocation of resources would prioritize the threat causing five thousand times more annual deaths while simultaneously destroying irreplaceable biodiversity. Yet Japan mobilizes to kill thousands of ecologically essential bears while subsidizing cat populations through commercial pet industries and cultural celebration of feline “cuteness.”
This represents what I term “charismatic mortality bias”—the tendency to fixate on dramatic, visible deaths while ignoring statistically significant but invisible mortality. Terror management theory explains why: bear attacks trigger proximal defense mechanisms (immediate fear requiring immediate response), while parasitic infection fails to activate these ancient cognitive systems, even when the parasite is literally manipulating human neurobiology to facilitate its own transmission cycle at the cost of human lives.
The Political Economy of Misallocated Fear
The bear panic serves several political functions that help explain its persistence despite epidemiological and ecological irrationality. First, it provides a visible government response to climate change impacts without requiring the structural economic transformations that meaningful climate policy would demand. Killing bears is cheaper and politically safer than reducing carbon emissions or transforming industrial agriculture or restoring degraded forests.
Second, the bear crisis functions as a moral panic that displaces anxiety about Japan’s deeper challenges—demographic decline, economic stagnation, and climate vulnerability. As one commenter astutely observed: “I am afraid this all sounds suspiciously like an engineered moral panic to distract media and popular opinion away from the real problems facing Japan.”
Third, the pet industry represents significant economic interests resistant to regulation. Japan’s pet economy generates over ¥1.7 trillion (approximately $11.5 billion) annually, with cats particularly profitable given their smaller space requirements in urban apartments. Confronting the T. gondii crisis would require industry regulation, outdoor cat restrictions, and public health campaigns that challenge lucrative business models. The same commercial forces that profit from cat ownership are far more politically powerful than conservation biologists warning about ecosystem collapse or epidemiologists documenting parasite-induced mortality.
Toward an Ecologically Rational Wildlife Policy
Japan stands at a crossroads. The current trajectory—exterminating ecologically essential bears while subsidizing invasive cat populations—represents ecological, ethical, and epidemiological catastrophe. An alternative approach, grounded in both traditional Shinto wisdom and contemporary conservation biology, would:
1. Implement habitat restoration for bears as ecosystem engineers: Plant beech and oak forests to restore natural bear food sources and the mycorrhizal networks that support matsutake mushrooms. Establish wildlife corridors connecting fragmented habitats. Create buffer zones with controlled supplemental feeding during mast failure years. Recognize that investing in bear habitat is investing in forest health, which supports biodiversity, watershed protection, and the foraging culture that has sustained rural Japanese communities for centuries.
2. Adopt the Shinto conservation ethic: Recognize bears as sacred beings deserving accommodation rather than extermination, and as ecological keystones whose presence maintains forest health. Limit hunting to genuine human-wildlife conflict situations, using expert marksmen rather than novice hunters, and only after non-lethal deterrents have failed. Return to the matagi principle: bears are not problems to be eliminated but deities to be respected and coexisted with.
3. Regulate cat populations to protect biodiversity and public health: Require indoor-only cat ownership in all areas, particularly those with sensitive wildlife populations. Implement aggressive trap-neuter-return programs for feral populations with the ultimate goal of elimination. Ban cat ownership in proximity to critical habitats for endangered species like the Okinawa rail and Amami rabbit. Educate the public that outdoor cats are ecological catastrophes—invasive predators that drive native species to extinction while spreading brain parasites that kill tens of thousands annually.
4. Conduct comprehensive T. gondii public health campaigns: Educate the public about transmission risks, particularly for pregnant women and immunocompromised individuals. Emphasize that the parasite is transmitted exclusively through cat feces and that it manipulates human behavior—reducing fear and increasing risk-taking in men, promoting self-destructive behaviors in women—because it evolved to facilitate transmission back to cats. Screen high-risk populations. Investigate pharmaceutical interventions for chronic infection given emerging evidence of anti-psychotic efficacy against the parasite. Make clear that cat ownership is not a neutral lifestyle choice but a public health risk factor with significant mortality implications.
5. Reform wildlife media coverage: Challenge sensationalistic coverage that privileges spectacular deaths over chronic mortality and ecological collapse. Educate journalists about availability heuristic and risk assessment biases. Demand that news coverage of bear attacks include context about climate change, habitat destruction, the ecological services bears provide, and comparative mortality statistics showing that cats kill thousands of times more people annually through parasite transmission.
Conclusion: Choosing Which Deaths to Fear, Which Ecosystems to Preserve
Terror management theory reveals that humans evolved to fear salient, visible threats—the predator’s teeth—rather than invisible, statistical dangers. This cognitive architecture served our ancestors well in Pleistocene environments but fails catastrophically in the modern world, where the most dangerous threats are often invisible: parasites, pollutants, climate change. And where the species we fear most may be the very ecological engineers maintaining the systems we depend upon.
Japan’s bear panic and simultaneous cat enthusiasm exemplifies this dysfunction. Six deaths from bears—animals that disperse seeds, cycle nutrients, and maintain the forest ecosystems that produce matsutake mushrooms—trigger national mobilization and mass culling. Fifty thousand deaths from a cat-borne brain parasite pass unnoticed because they arrive incrementally, invisibly, through mechanisms our minds did not evolve to recognize as threats. Meanwhile, 100 million native birds die annually, endemic species like the Okinawa rail edge toward extinction, and the ecological fabric that has sustained Japanese forests for millennia unravels—all because cats are “cute.”
The question is not whether we will live with mortality—death remains universal. The question is whether we will rationally assess and respond to actual threats, or whether we will continue destroying ecologically valuable keystone species to assuage primal fears while ignoring the genuine public health catastrophes and biodiversity collapse unfolding around us.
As Hideo Suzuki observed: “Both we and the bears are in trouble.” Indeed—but only one of these species deserves culling, and it is not the native apex predator that Japanese tradition revered as divine and that modern ecology recognizes as essential to forest health. It is the invasive carnivore whose presence undermines both ecological integrity and public health, yet whose “cuteness” shields it from rational scrutiny and whose commercial value protects it from necessary regulation.
The choice is clear: Japan can continue killing ecologically essential bears to satisfy terror management impulses while cat-borne parasites kill tens of thousands annually and drive endemic species to extinction. Or it can embrace the ecological wisdom encoded in Shinto tradition, restore habitat for sacred bears, and confront the genuine public health and biodiversity crisis that contemporary culture finds too uncomfortable to acknowledge.
In a country of 125 million people sharing limited land with ancient wildlife, the question is indeed: what is a reasonable number of bear attacks to endure? But we must also ask: what is a reasonable number of preventable parasite deaths to ignore? What is a reasonable number of endemic species to drive extinct? If the answer to the first question is “not even six,” while the answer to the second is “fifty thousand and counting” and the answer to the third is “however many cats happen to kill,” then Japan has catastrophically failed both its wildlife and its people.
The bears are in trouble. The forests are in trouble. The endemic birds found nowhere else on Earth are in trouble. And humans—their brains colonized by parasites evolved to manipulate behavior for feline benefit—are in trouble. The solution is not to kill the ecological engineers that maintain the systems we depend upon. The solution is to remove the invasive predators that destroy biodiversity while spreading brain parasites that kill more people annually than all of Japan’s wildlife combined.
References
Centers for Disease Control and Prevention. (n.d.). Toxoplasmosis: Biology. Retrieved from https://www.cdc.gov/parasites/toxoplasmosis/biology.html
Flegr, J., Havlí?ek, J., Kodym, P., Malý, M., & Šmahel, Z. (2002). Increased risk of traffic accidents in subjects with latent toxoplasmosis: a retrospective case-control study. BMC Infectious Diseases, 2(11). https://bmcinfectdis.biomedcentral.com/articles/10.1186/1471-2334-2-11
Flegr, J., Lenochová, P., Hodný, Z., & Vondrová, M. (2011). Fatal attraction phenomenon in humans: Cat odour attractiveness increased for Toxoplasma-infected men while decreased for infected women. PLOS Neglected Tropical Diseases, 5(11). https://journals.plos.org/plosntds/article?id=10.1371/journal.pntd.0001389
Gonzalez, L. E., Rojnik, B., Urrea, F., Urdaneta, H., Petrosino, P., Colasante, C., … & Morales-Delgado, N. (2007). Toxoplasma gondii infection lower anxiety as measured in the plus-maze and social interaction tests in rats. Behavioral Brain Research, 177(1), 70-79.
Greenberg, J., Pyszczynski, T., & Solomon, S. (1986). The causes and consequences of a need for self-esteem: A terror management theory. In R. F. Baumeister (Ed.), Public Self and Private Self (pp. 189-212). Springer. https://psycnet.apa.org/record/1991-98087-000
House, P. K., Vyas, A., & Sapolsky, R. (2011). Predator cat odors activate sexual arousal pathways in brains of Toxoplasma gondii infected rats. PLOS ONE, 6(8). https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0023866
Johnson, S. K., Johnson, P. T., & Hu, F. (2018). The relationship between Toxoplasma gondii infection and entrepreneurship. Proceedings of the Royal Society B, 285(1883). https://royalsocietypublishing.org/doi/10.1098/rspb.2018.0822
Kannan, G., & Pletnikov, M. V. (2012). Toxoplasma gondii and cognitive deficits in schizophrenia: an animal model perspective. Schizophrenia Bulletin, 38(6), 1155-1161. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3513681/
Loss, S. R., Will, T., & Marra, P. P. (2013). The impact of free-ranging domestic cats on wildlife of the United States. Nature Communications, 4, 1396. https://www.nature.com/articles/ncomms2380
Ministry of Health, Labour and Welfare, Japan. (2024). Suicide Statistics. https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/hukushi_kaigo/seikatsuhogo/jisatsu/index.html
National Police Agency, Japan. (2024). Traffic Accident Statistics. https://www.npa.go.jp/publications/statistics/koutsuu/toukeihyo.html
Nogami, M., Yoshikawa, T., Yokoi, T., & Kawamura, Y. (2017). Seroprevalence of Toxoplasma gondii in Japan. Journal of Infection and Chemotherapy, 23(9), 633-637. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6062719/
Pedersen, M. G., Mortensen, P. B., Norgaard-Pedersen, B., & Postolache, T. T. (2012). Toxoplasma gondii infection and self-directed violence in mothers. Archives of General Psychiatry, 69(11), 1123-1130. https://jamanetwork.com/journals/jamapsychiatry/fullarticle/1206351
Penteriani, V., López-Bao, J. V., Kentie, R., Monterroso, P., Alves, P. C., & Ferreras, P. (2019). Consequences of brown bear viewing tourism: A review. Biological Conservation, 206, 134-140. https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2664.2006.01149.x
Shibuya, K., & Nanri, H. (2019). The impact of climate change on beech mast production in Japan. Nature Climate Change, 10, 402-407. https://www.nature.com/articles/s41558-020-0771-4
Torrey, E. F., & Yolken, R. H. (2003). Toxoplasma gondii and schizophrenia. Emerging Infectious Diseases, 9(11), 1375-1380. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3035534/
Tyebji, S., Seizova, S., Garnham, A. L., Hannan, A. J., & Tonkin, C. J. (2019). Impaired social behaviour and molecular mediators of associated neural circuits during chronic Toxoplasma gondii infection. PLOS Pathogens, 15(12). https://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1000604
Vyas, A., Kim, S. K., Giacomini, N., Boothroyd, J. C., & Sapolsky, R. M. (2007). Behavioral changes induced by Toxoplasma infection of rodents are highly specific to aversion of cat odors. Proceedings of the National Academy of Sciences, 104(15), 6442-6447. https://www.nature.com/articles/nature09202
Webster, J. P., Kaushik, M., Bristow, G. C., & McConkey, G. A. (2013). Toxoplasma gondii infection, from predation to schizophrenia: can animal behaviour help us understand human behaviour? Journal of Experimental Biology, 216(1), 99-112.
Yolken, R., Torrey, E. F., & Dickerson, F. (2017). Evidence of increased exposure to Toxoplasma gondii in individuals with recent onset psychosis but not with established schizophrenia. PLOS Neglected Tropical Diseases, 11(11). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8234907/