Defense Reactions Research Articles

Deciphering the role of growth regulators in enhancing plant immunity against herbivory.

Plants are central to global food production, and the pursuit of sustainability aims to enhance or preserve food quality while safeguarding the environment. Due to their immobility, plants are unable to evade unfavourable climatic setups or interactions with other living creatures. Upon their interaction with insect herbivores, plants face biotic stress, which is a constant challenge for plants, causing molecular, physiological, and biochemical changes and reducing their productivity. To combat biotic stress caused by herbivores, plants have evolved intricate defence mechanisms through growth regulators such as auxins, cytokinins, gibberellins, salicylic acid (SA), jasmonic acid (JA), ethylene (ET), abscisic acid (ABA), strigolactones and brassinosteroids. The intricate network of specific proteins, metabolites and certain phytohormones orchestrates plant defensive reactions, leading to their skilful coordination in responding to insect attacks. Comprehending the defence mechanisms holds the key to mitigating significant crop and economic losses. This review entails a comprehensive analysis of the role of growth regulators in enhancing plant immunity against herbivory, highlighting the substantial efforts by the scientific community to manage and mitigate damages from biotic stress in plants, ultimately contributing to the advancement of sustainable agriculture.

When Influencers Compare Brands: Defensive Processing of Sponsored Comparative Messages and Effects on Consumer Evaluations

Social media influencers comparing competing products helps draw the desirable consumer attention to their product recommendation. However, it may also risk backfiring, especially when the influencer post is sponsored by a given brand. In the present study, we explored consumer evaluations of sponsored influencer comparative marketing through two important defensive mechanisms—counterarguing and inferences of manipulative intent with a 2 (message appeal: noncomparative vs. comparative) × 2 (content sponsorship: organic vs. sponsored) between-subjects online experiment (N = 325). We found that when the post was sponsored, the comparative message generated significantly greater defensive reactions than the noncomparative message, leading to lower perceived trustworthiness and authenticity of the influencer, unfavorable brand attitude, and lower purchase intention. In contrast, when the post was organic, the observed difference diminished. Furthermore, we found more prominent effects via inferences of manipulative intent than counterarguing, suggesting that consumers considerably value the genuineness behind product promotion from influencers. These findings extend research on comparative advertising to the trending influencer marketing context, shedding novel light on mechanisms underlying consumer responses to sponsored comparative messaging.

Overgeneralization of autonomic defensive reactions in obesity

Generalizing defensive responses to new stimuli resembling learned threats is an adaptive process within an ever-changing environment. However, evaluation mechanisms excessively biased toward generalization (i.e., overgeneralization) may underlie anxiety-related symptoms. In the context of obesity, fear memory and fear generalization processes have never been investigated. In this study, participants with obesity and healthy participants as controls underwent a single-cue auditory fear conditioning paradigm and recognition memory tasks. We analyzed the autonomic reactions evoked by threat-predictive and new stimuli, as well as the recognition performance towards the same cues. We found that participants with obesity displayed similar autonomic defensive responses to a learned fearful stimulus, but enhanced reactions to new stimuli, when compared with the controls. We detected no significant differences between groups in recognition abilities. Our results provided the first evidence that obesity may widen fear generalization patterns. This alteration may encourage future research in investigating the link between emotional dysregulation and clinical anxiety-related symptoms in obesity.

Disorders of cervical maturation under wartime stressful conditions

Pregnancy itself is a prerequisite for stress reactions. Even in the physiological course, pregnancy has a certain impact on a woman’s psyche, and some authors even consider it as a crisis situation or a “period of psychological uncertainty”. Women have different types of reactions to pregnancy: from the absence of any psychological problems to neurotic personality development.All the hardships of wartime affect not only the mother’s organism and her psychological state, but also the state of the unborn fetus, which is programmed with certain physical and mental health characteristics for the rest of its life.To prevent these negative effects, pregnant women during the pregravid period and gestation should take preventive measures aimed at strengthening the organism’s defense reactions in adverse conditions. These include a rational nutritious diet, determination of a woman’s personality type by a perinatal psychologist and appropriate psychological practices, and sufficient supplementation of important vitamins and minerals with antioxidant and other protective properties.Pregnancy under the influence of prolonged chronic stress can be complicated not only by purely obstetric and perinatal problems, but also by disorders of the formation of the labour dominant and preparatory processes in the cervix. As a result, this can lead to miscarriage due to the development of tokophobia as a psychological component of these disorders.Cervical maturation before childbirth is a multifactorial process that includes numerous elements, complex processes at the psychological, systemic, tissue, cellular, gene and molecular levels. Comprehensive preparation of a woman’s organism for childbirth in conditions of chronic stress and certain tokophobia (a woman’s fear of childbirth and uncertainty of the future for her and her child during the war) is not only about preventing stressful effects during pregnancy (magnesium complexes with B vitamins – up to the 36th week), conducting a complex of psychoprophylactic therapy and psychophysiological preparation for childbirth from the 37th week, but also in local impact on the cervical state, taking into account changes in connective tissue and correction of the infectious factor at the same time of pregnancy. For this purpose it is advisable and reasonable to prescribe vaginal suppositories based on hyaluronic acid (HA) to accelerate preparatory changes in the cervical tissues by stimulating the synthesis of its own HA and with antibacterial effects due to a complex of plant extracts.

Beyond victimhood and perpetration: Reconstruction of the ingroup's historical role in eight Eastern and Western European countries under Nazi occupation

AbstractThe Nazi regime's aggressive expansion across Europe during WWII created a landscape of suffering, resistance, and collaboration. How do lay Europeans today reconstruct their ingroup's roles during Nazi occupation, and how do different role representations relate to defensive responses aimed at protecting the ingroup from threat? We tested two theoretical predictions: Following the identity threat prediction, we expected that denying culpability but endorsing morally favorable group representations (e.g., victim‐heroism) would represent an ingroup‐defensive strategy, correlating with other defensive responses, such as victim‐directed negativity or victim‐blaming. Following the identity management prediction, we expected that precisely accepting culpability and acknowledging threatening representations (e.g., willing collaboration with Germans) would form the basis for a defensive stance and thus correlate with defensive intergroup reactions. Analyzing data from nine European samples spanning eight countries (N = 5474), we found support for the identity management prediction in six contexts: Lay representations as willing collaborators were associated with negative collective emotions and correlated with victim‐directed negativity, whereas victim‐hero representations showed no such connections. The remaining three countries revealed a mixture of the two identity accounts. We discuss implications for understanding historical representations and identity protection in groups that were both victims and perpetrators of massive intergroup atrocities.

In vitro, modulation of the dominant intestinal microbiota in type 2 diabetics by controlling antimicrobial activity with the methanolic extract of Pistacia lentiscus L.

The intestinal microbiota has become known as the ‘second brain’ a complementary organ for most metabolic and defensive reactions. The study aims to investigate the potential of the methanolic extract of Pistacia lentiscus leaves to modulate the dominant flora in type 2 diabetic patients compared to healthy subjects, by controlling growth kinetics. Comparative study between the dominant flora of type two diabitics (DT2) and helthy subjects (HS) stools. Using fully sterilized experimental space and materials, the germs were isolated through an antimicrobial study, and their microbial growth kinetics, were analyzed both with and without phytotherapeutic treatment in vitro. This was carried out as part of a study into the effect of methanolic extract from the leaves of the Pistacia lentiscus L. plant harvested in north-west Algeria. The study found a decrease in the quantity of lactobacilli and streptococci in DT2 and an inverse relationship between enterobacteria and streptococci in all microbiotas. On the molecular side. The methanolic extract of P lentiscus leaves gave a super antimicrobial effect for E coli and Clostridium sp at concentrations below their Minimum Inhibitory Concentration (2 mg mL-1), compared with the other gram positives studied, lactobacillus and Streptococcus (4 mg mL-1). This beneficial action confirms the high antimicrobial effect of the methanolic extract of P lentiscus leaves with lower concentration for the quantitative restauration of intestinal microbiota, the intermediary between insoluno-resistance and metabolism. Pistacia lentiscus has the potential to modulate the dominant flora in type 2 diabetics, through its regulatory antimicrobial power.

Defensive behaviors and c-fos expression in the midbrain.

Pavlovian fear conditioning serves as a valuable method for investigating species-specific defensive reactions (SSDRs) such as freezing and flight responses. The present study examines the role of white noise under different experimental conditions. Given that white noise has been shown to elicit both conditional (associative) and unconditional (nonassociative) defensive responses, we compared the response to noise following three separate training conditions: shock-only, white noise paired with shock, and context-only. Results showed that baseline freezing level significantly changed across groups: Both the shock-only group and the white noise paired with shock group froze more than the context-only group on the test day. White noise evoked differential freezing between groups on day 2: The shock-only group froze more than the context-only group although both groups were never exposed to white noise during training. Further, an activity burst triggered by white noise was similar for the shock-only and white noise paired with shock groups during testing, although shock-only group was never exposed to white noise stimuli during training. This aligned with c-fos data, indicating similar c-fos activity levels across different periaqueductal gray (PAG) regions for both shock-only and white noise paired with shock groups. However, the driving force behind c-fos activation-whether freezing, activity burst, or a combination of both-remains uncertain, warranting further analysis to explore specific correlations between SSDRs and c-fos activity within the PAG and related brain areas.

Exploring physiotherapy strategies in arthrogenic muscle inhibition: A scoping review

Arthrogenic muscular inhibition (AMI) is the presynaptic continual reflex inhibition of the surrounding muscles. It is a defensive reaction that lowers motor neuron activity to prevent further damage; however, if it persists, it can cause muscle atrophy and weakness, which can cause functional limitations. It usually involves quadriceps muscle post knee injuries and surgeries. Though it can be appreciated at any joint post injury or surgery like shoulder , elbow and ankle. Recent studies shows that post injury or surgery, tissues respond by reflex inhibition mechanism and is unnoticed by many therapists. The aim of this review is to analyse the various approaches available in the physiotherapy rehabilitation for treating AMI of any joint and to know the best treatment approach to be used for optimising the effects of AMI. Total of 37 articles were considered to identify the different outcomes and interventions used in treating AMI. In conclusion, Effective physiotherapy interventions are necessary to address AMI and enhance joint function and muscle activation. NMES, cryotherapy, and certain strengthening exercises are a few examples of interventions that can help get past the neural inhibition limiting muscle activation surrounding an injured joint. The implementation of early physiotherapy interventions is essential for preventing muscle atrophy and regaining normal movement patterns. In order to advance patient rehabilitation and maximize healing and functional outcomes, a customized protocol with particular demands is required.

Plant resistance to pathogens as a result of gene interaction

Modern information on the genomics of plants and plants’ pathogens as well the achievements of molecular biology have made it possible to state the participation of gene products, proteins, in the organization of molecular complexes that are assembled to implement a certain character of the phenotype. The character of plant “resistance/sensitivity” to a certain biotic factor is also interesting because there is an interaction not only between the genes of one organism, but between the genes of organisms that lie in different kingdoms of life.Plant resistance to pathogens can be passive (provided mainly by characters of plant morphology) and active. Active resistance is formed as a result of the penetration of the pathogen or its elicitors and effectors into the plant. Active protection of the plant at the molecular level is expressed in the launch of the MAPK cascade, the accumulation of reactive oxygen species, and an increase in the flow of calcium ions to the cell. Active protection can be implemented on two levels. The first level, RTI (PAMP Triggered Immunity), develops in response to plant contact with a wide range of non-adapted pathogens. The resistance (immunity) that is formed in this case is called non-specific, or horizontal, or quantitative. The molecular instrument for initiating the defensive reaction is the PRR (Pattern Recognition Receptors). Adapted pathogens are able to overcome RTI by sending effectors to plant cells. These are protein molecules whose function is to create conditions within the cell that are more permissive to the pathogen. The effector can be recognized by the plant’s specific NLR (Nod-Like Receptors), and complementation occurs between the two. There are other specific plant molecules, nonNLR, with a different type of protein product interaction for recognition. In both cases, the second level of protection, ETI (Effector Triggered Immunity), develops. The set of molecular processes that occur at the second level of protection does not differ from the set of the first level, but the processes occur more intensively and are accompanied by the death of the affected cells. This prevents the further spread of the pathogen throughout the plant. The molecular events of the first and second levels of protection are not isolated. The interaction between them involving the products of plant genes and pathogen genes is described by the “zig-zag-zig”-model, invasion model, and the integrated iceberg model. The interaction of plant genes for effector recognition is described by the “guard” and “decoy” models. To initiate a defensive reaction, plant receptors, which can sometimes differentiate into sensors and helpers, form protein complexes, resistosomes.

Nitric oxide-signalling affects panic-like defensive behaviour and defensive antinociception neuromodulation in the prelimbic cerebral cortex

Rationale: The prelimbic division (PrL) of the medial prefrontal cortex (mPFC) is a key structure in panic. Objectives: To evaluate the role of nitric oxide (NO) in defensive behaviour and antinociception. Methods: Either Nω-propyl-L-arginine (NPLA) or Carboxy-PTIO was microinjected in the PrL cortex, followed by hypothalamic treatment with bicuculline. The exploratory behaviours, defensive reactions and defensive antinociception were recorded. Encephalic c-Fos protein was immunolabelled after escape behaviour. Results: NPLA (an inhibition of nNOs) decreased panic-like responses and innate fear-induced antinociception. The c-PTIO (a membrane-impermeable NO scavenger) decreased the escape behaviour. PrL cortex pre-treatment with c-PTIO at all doses decreased defensive antinociception. c-Fos protein was labelled in neocortical areas, limbic system, and mesencephalic structures. Conclusion: The NPLA and c-PTIO in the PrL/mPFC decreased the escape behaviour and defensive antinociception organised by medial hypothalamic nuclei. The oriented escape behaviour recruits neocortical areas, limbic system, and mesencephalic structures. These findings suggest that the organisation of defensive antinociception recruits NO-signalling mechanisms within the PrL cortex. Furthermore, the present findings also support the role of NO as a retrograde messenger in the PrL cortex during panic-like emotional reactions.

Effect of Magnetic Field and UV-C Radiation on Postharvest Fruit Properties

This review focuses on the recent information on the effect of different types of magnetic fields (MFs) and ultraviolet radiation (UV-C) on the processes that may finally affect fruit quality and its storage potential. Firstly, the biological effect of MFs on every plant’s growth and development level is described. The magnetic field interacts with a plant’s metabolism and changes the permeability of membranes affecting cells’ homeostasis. It also could affect early seedling development, stimulating enzyme activity and protein synthesis, and later on nutrient and water uptake of adult plants. In some cases, it makes plants more resilient, increasing their tolerance to environmental stresses. Also, MF treatment could lower the disease index of plants, thus improving the internal and external fruit quality indices. The second part of this review focuses on interesting perspectives of using UV-C radiation to reduce postharvest fruit diseases, but also to delay fruit ripening and senescence. The application of UV-C light to combat postharvest infections is associated with two mechanisms of action, such as direct elimination of microorganisms located on the fruit surface and indirect triggering of the plant’s defense reaction. Moreover, the use of hormetic doses of UV-C can additionally increase the nutritional properties of fresh fruit, lead to the accumulation of desired phytochemicals such as polyphenols, for example, to increase anthocyanin or resveratrol content, or elevate antioxidant activity.

Mass Spectrometry Imaging to map metabolites in plant-microbe interactions: grapevine as a case study

Every year, viticulture faces several disease outbreaks caused by pathogens with different life cycles and modes of action, and due to climate changes, the appearance of new pathogens is a concern for viticulture. To cope with the different pathogenic microorganisms, the plant must recognise the invading agent and arm itself with an arsenal of defence reactions, including the accumulation of antimicrobial metabolites.The modulation of plant metabolites is one of the first responses to biotic factors. Their rapid synthesis can greatly contribute to strengthening plant defence allowing it to adapt, minimise pathogen colonisation and survive. Despite the scientific community's efforts to characterise the grapevine defence responses to pathogens, the molecules involved in pathogen control and their specific localisation remain to be deciphered.Mass Spectrometry Imaging (MSI) analytical techniques enable one to visualise and map the spatial distribution of numerous biological molecules within plant tissues allowing a better understanding of their biosynthesis, localisation and function.In this review, we explore the applications of MSI techniques to the study of plant/microbe interactions focusing on grapevine studies. This review opens new doors to gain a comprehensive understanding of the dynamics and variations of metabolite profiles in grapevine organs, at different developmental stages and under various stress conditions. This knowledge is crucial for elucidating the role of specific metabolites in grapevine defence mechanisms, and for identifying specific regions of high or low metabolite production, which can contribute to targeted breeding to improve disease resistance traits and have an impact on grapevine productivity and quality.

A descending pathway from the lateral/ventrolateral PAG to the rostroventral medulla mediating the vasomotor response evoked by social defeat stress in rats.

The stress-induced cardiovascular response is based on the defensive reaction in mammals. It has been shown that the sympathetic vasomotor pathway of acute psychological stress is indirectly mediated via neurons in the rostroventral medulla (RVM) from the hypothalamic stress center. In this study, direct projections to the RVM and distribution of neuroexcitatory marker c-Fos-expressed neurons were investigated during social defeat stress (SDS) in conscious rats. The experimental rat that was injected with a neural tracer, FluoroGold (FG) into the unilateral RVM, was exposed to the SDS. Double-positive neurons of both c-Fos and FG were locally distributed in the lateral/ventrolateral periaqueductal gray matter (l/vl PAG) in the midbrain. These results suggest that the neurons in the l/vl PAG contribute to the defensive reaction evoked by acute psychological stress, such as the SDS. During the SDS period, arterial pressure (AP) and heart rate (HR) showed sustained increases in the rat. Therefore, we performed chemical stimulation by excitatory amino acid microinjection within the l/vl PAG and measured cardiovascular response and sympathetic nerve activity in some anesthetized rats. The chemical stimulation of neurons in the l/vl PAG caused significant increases in arterial pressure and renal sympathetic nerve activity. Taken together, our results suggest that neurons in the l/vl PAG are a possible candidate for the cardiovascular descending pathway that modulates sympathetic vascular resistance evoked by acute psychological stress, like the SDS.NEW & NOTEWORTHY The sympathetic vasomotor pathway of an acute psychological stress-induced cardiovascular response is mediated via neurons in the RVM indirectly from the hypothalamus. In this study, we showed the relaying area of the efferent sympathetic vasomotor pathway from the hypothalamus to the RVM. The results suggested that the pressor response during psychological stress is mediated via neurons in the lateral/ventrolateral PAG to the RVM.

LbSakA-mediated phosphorylation of the scaffolding protein LbNoxR in the ectomycorrhizal basidiomycete Laccaria bicolor regulates NADPH oxidase activity, ROS accumulation and symbiosis development.

Ectomycorrhizal symbiosis, which involves mutually beneficial interactions between soil fungi and tree roots, is essential for promoting tree growth. To establish this symbiotic relationship, fungal symbionts must initiate and sustain mutualistic interactions with host plants while avoiding host defense responses. This study investigated the role of reactive oxygen species (ROS) generated by fungal NADPH oxidase (Nox) in the development of Laccaria bicolor/Populus tremula × alba symbiosis. Our findings revealed that L. bicolor LbNox expression was significantly higher in ectomycorrhizal roots than in free-living mycelia. RNAi was used to silence LbNox, which resulted in decreased ROS signaling, limited formation of the Hartig net, and a lower mycorrhizal formation rate. Using Y2H library screening, BiFC and Co-IP, we demonstrated an interaction between the mitogen-activated protein kinase LbSakA and LbNoxR. LbSakA-mediated phosphorylation of LbNoxR at T409, T477 and T480 positively modulates LbNox activity, ROS accumulation and upregulation of symbiosis-related genes involved in dampening host defense reactions. These results demonstrate that regulation of fungal ROS metabolism is critical for maintaining the mutualistic interaction between L. bicolor and P. tremula × alba. Our findings also highlight a novel and complex regulatory mechanism governing the development of symbiosis, involving both transcriptional and posttranslational regulation of gene networks.

Is Monogamy Part of ‘Who We Are’? Romantic Norms, Defensiveness, and Collective Identity

AbstractI discuss a certain kind of emotionally charged negative reaction to defences of non-monogamous love, which I call collective-identity reactions. Expanding on work by Audrey Yap and Jonathan Ichikawa, who consider defensive reactions grounded in individual identity, I argue that collective-identity reactions are characteristically associated with claims about who we are, and motivated by a sense that the relevant we is in some way under threat. Looking into which we might be threatened by defences of non-monogamy, and why, reveals that this apparently personal subject matter is in fact entangled with global political issues like capitalism and American cultural imperialism. I conclude with some thoughts about ameliorative strategies for situations structurally similar to this one.

Do Negative Self-Evaluative Emotions Enhance Healthier Food Choices? Exploring the Moderating Role of Self-Affirmation.

Negative self-evaluative emotions arise when an individual engages in behavior that is perceived as inadequate or inconsistent with personal or societal norms and values, leading to feelings of inadequacy, shame, and dissatisfaction with oneself. These emotions are a central motivating force for changing unhealthy behaviors. However, negative evaluative emotions may also direct individuals towards defensive reactions such as reactance and avoidance. This can cause negative self-evaluative emotions to be less effective in reducing unhealthy behavior. More importantly, empirical evidence is needed to explore strategies for enhancing the effectiveness of interventions. In this study, we used an online experiment with 100 student participants to examine if increasing self-affirmation can increase the effectiveness of negative self-evaluative emotions in reducing unhealthy food consumption. We found that negative self-evaluative emotions can significantly increase healthy food consumption. However, our analysis did not reveal a significant moderating impact of self-affirmation on the effectiveness of negative self-evaluative emotions in reducing unhealthy consumption. This is the first study to explore the moderating impact of self-affirmation on the effectiveness of negative self-evaluative emotions on health behavioral change, which opens new avenues for studying how to apply the combination of stimulating negative self-evaluative emotions and increasing self-affirmation to induce behavioral change regarding healthy diets and even a broader range of fields.

Understanding the Sociocultural Dynamics of Loneliness in Southern Spanish Youth

Loneliness among young people has been increasing in recent years and is considered a major public health problem. This article delves into the sociocultural dynamics that favour the experiences of loneliness. For this purpose, 40 students between 19 and 24 years of age were interviewed using the photo elicitation interview (PEI) strategy. The results show a gradual normalization of the experience of loneliness and an effort to become accustomed to it. Virtual relationships and isolation linked to the COVID-19 pandemic are considered the two factors that have most enabled a climate prone to loneliness. Young people identify a few elements that feed social loneliness, such as an understanding of instrumental relationships, a scarcity of intimate relationships, a demand for hyperconnectivity, a fantasy of independence and a culture of positivity that hinders the establishment of quality social ties. Faced with hostile relational conditions, youth are sent into a cycle of loneliness. The greater the distrust of the environment is, the greater the defensive reactions and social distancing, and the greater the search for nearby spaces of refuge, security and shelter. Social withdrawal makes in-person relationships difficult and strengthens the need to isolate and become accustomed to loneliness.

The Relationships between the Population Density of Fir Bark Beetles and Niche Breadth.

Bark beetles are a significant link in the chain of diseases that lead to the accelerated dying of firs (Abies alba Mill.), a key species in the cultivation of stable mixed-tree stands. The aim of this work was to evaluate biotic interactions in populations of bark beetles that colonised natural traps made from firs. The tested hypothesis was that the niche breadth of the species increases with the increasing density of the population. The research was carried out in near-natural forests containing fir, growing in the Suchedniów-Oblęgorek Landscape Park in central Poland. Data were collected from 30 traps trees and 30 windfalls in the years 2010-2023. Cryphalus piceae Ratz. prefers heavily weakened trees, as shown by the fact that it colonised all of the natural traps, which lack any defensive reactions. The sampling method used in the study proved effective, as confirmed by the segregation of the niches of all of the bark beetles. Using nonlinear regression (linearisable model and piecewise linear regression), models were constructed that describe the niche breadths of the bark beetles. The niche parameter is correlated with the density of colonisation. The derived models explain around 77-84% of the variation in the niche breadth of bark beetles on natural traps. The mean relative errors of estimation do not exceed 20%. The niche breadth parameter obtained from the derived regression equations may be used in models that describe-for example-the impact of observed climate change on the population dynamics of bark beetles.

Ventral Pallidum and Amygdala Cooperate to Restrain Reward Approach under Threat.

Foraging decisions involve assessing potential risks and prioritizing food sources, which can be challenging when confronted with changing and conflicting circumstances. A crucial aspect of this decision-making process is the ability to actively overcome defensive reactions to threats and focus on achieving specific goals. The ventral pallidum (VP) and basolateral amygdala (BLA) are two brain regions that play key roles in regulating behavior motivated by either rewards or threats. However, it is unclear whether these regions are necessary in decision-making processes involving competing motivational drives during conflict. Our aim was to investigate the requirements of the VP and BLA for foraging choices in conflicts involving overcoming defensive responses. Here, we used a novel foraging task and pharmacological techniques to inactivate either the VP or BLA or to disconnect these brain regions before conducting a conflict test in male rats. Our findings showed that BLA is necessary for making risky choices during conflicts, whereas VP is necessary for invigorating the drive to obtain food, regardless of the presence of conflict. Importantly, our research revealed that the connection between VP and BLA is critical in controlling risky food-seeking choices during conflict situations. This study provides a new perspective on the collaborative function of VP and BLA in driving behavior, aimed at achieving goals in the face of dangers.

Direct contact and very rapid valgus distortion characterise the injury mechanism of anterior cruciate ligament ruptures in judo.

To analyse anterior cruciate ligament (ACL) rupture (ACLR) injury mechanisms in competitive judo using systematic video analysis, focusing on contact situations and biomechanics. Seventeen videos of judo competitions wherein athletes developed ACLRswere included and retrospectively evaluated by five analysts. In all videos, the momentof initial contact and the index frame were defined. The judo techniques leading to the injury; the occurrence of direct contact, indirect contactor noncontact mechanisms; the time interval between the initial contact and index frame; the positions of the hip, kneeand foot in relation to the initial contact and index frame; and the balance status during the initial contact and index frame were recorded. Eleven (65%) of ACLRs in judo involved direct contact. The mean time interval between initial contact and index frame was 15 ± 22 ms. Thirteen (77%) athletes were not balanced at initial contact. In the index frame, the hip was abducted in all cases and in combination with internal rotation in 12 (71%) cases. From initial contact to index frame, hip flexion increased in all cases; at index frame, the knee joint was internally rotated relative to the trunk in 12 (71%) cases, and the knee flexion angles increased from the initial contact. In the index frame, the foot was externally rotated relative to the knee in 12 (71%) cases, and severe valgus development of the knee with valgus collapse was observed in 14 (82%) cases. A direct attack on the knee was the most common injury mechanism observed. Valgus distortion appears to be the most important component of the mechanism of injury. With this knowledge, 'modified defence reactions'for specific judo techniques can be developed to reduce the injury risk. Level IV.