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Open research questions in Neuroendocrine regulation and behavior

68 unresolved questions extracted from the limitations and future-work sections of 992 Neuroendocrine regulation and behavior papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Using intersectional, projection-specific neural circuit perturbations and in vivo imaging, we discovered that isolation-induced decreases in social motivation are governed by an underexplored projection from the anterodorsal bed nucleus of the stria terminalis (adBNST) to the nucleus accumbens (NAc).

    Extended amygdala orchestrates social motivation in socially isolated mice · 2026 · DOI

  • Barringtons nucleus (Bar) is a brainstem hub essential for lower urinary tract (LUT) function, yet the molecular identity and functional specialization of its neuronal subtypes remain poorly defined.

    Descending Enkephalinergic Neurons in Barrington's Nucleus Gate Sex-Biased Control of Micturition · 2026 · DOI

  • Neurotropic single-stranded RNA (ssRNA) viruses can disrupt brain function, yet little is known about how host virus receptor expression develops across the human lifespan or whether these trajectories differ between females and males.

    Sex- and Age-Specific Development of ssRNA Virus Receptor Expression in the Human Brain · 2026 · DOI

  • Orexin (hypocretin) neurons (OXN) broadcast arousal-related signals across the forebrain, yet how their inputs shape motivated behavior remains poorly understood.

    Orexinergic Input to the Supramammillary Region Links Threat Salience to Approach Behavior and Dopamine Release · 2026 · DOI

  • By shifting the focus from peptide-centric models to circuit-level mechanisms, this framework reconciles seemingly contradictory findings across brain regions and behavioral paradigms, and provides a foundation for the development of next-generation circuit-based therapeutic strategies targeting the oxytocin-vasopressin axis.

    Circuit logic of oxytocin and vasopressin complementary actions · 2026 · DOI

  • In contrast, TMC Dams showed some, but fewer changes relative to CTL, suggesting that separation from pups alone does not account for all disrupted behavior in RES dams.

    Maternal defense against intruders changes her subsequent maternal behavior and neural circuitry · 2026 · DOI

  • While NMS disrupts the oxytocinergic system, the specific contribution of oxytocin receptor (OTR) dysfunction during critical neurodevelopmental periods remains unclear.

    Oxytocin receptor dysfunction during neurodevelopment programs lasting pain hypersensitivity and sex-specific cognitive deficits · 2026 · DOI

  • Besides, other studies had confirmed that MeA receives direct inputs from both the OB and AOB [22,34], though it remains unclear whether the CeA receives similar direct olfactory afferents [22,34].

    Mapping of uterine-related neurons in central nervous system of mice by trans-synaptic tracing with pseudorabies virus · 2026 · DOI

  • Extended behavioral paradigms resulted in subject attrition, primarily due to loss of intravenous catheter patency. This attrition particularly impacted our punishment paradigms, in which significant numbers of mCherry-injected animals lost catheter patency. Control animal numbers were very low, and thus are included only in the Supplement. However, our previous work did include mCherry controls, and did not find an impact of CNO on punishment-related behav- iors (Li et al. 2025). Additionally, chemogenetic manipula- tions were tested using only one heroin dose. It is possible that alternative doses may have produced different behav- ioral outcomes. Furthermore, Saline/CNO injection order could not be fully counterbalanced; when attempted, CNO- induced behavioral alterations persisted into the following day, making full counterbalancing infeasible. However, because behavior was stable at the time of chemogenetic testing, we feel confident that the observed effects reflect CNO manipulations rather than effects of time. We acknowledge that subjects in the chemogenetic and electrophysiological experiments underwent different stress- induced reinstatement procedures, with only the chemoge- netic cohort exposed to the novel dual-hit paradigm. This difference reflects the fact that these studies were conducted in parallel as a part of separate experimental aims. It is pos- sible that exposure to an additional stressor could further alter DRN 5-HT electrophysiological profiles, potentially yielding different outcomes under dual-stress conditions. Moreover, an outstanding question concerns the temporal emergence of these electrophysiological alterations. Previ- ous work in our laboratory examining stress-induced rein- statement of cocaine seeking and morphine conditioned place-preference also revealed enhanced GABAergic sig- naling within the DRN. These changes only emerged with combined drug and stress history, and were not present with 1 3Psychopharmacology either factor alone (Staub et al. 2012; Li and Kirby 2016); we believe that a similar interaction may be driving effects observed here. However, expanding recording time points would facilitate the identification of specific experiential fac- tors, such as drug or stress exposure, that may differentially shape DRN electrophysiological adaptations over time. We examined only activation of the DRN 5-HT system and did not assess behavioral consequences of Gi-mediated inhibition of DRN 5-HT neurons. Across prior studies in our laboratory, inhibition of the DRN 5-HT system has not produced behavioral effects (Li et al. 2025; McElroy et al. 2025; McCloskey et al. 2025), which we believe may be attributable to low basal 5-HT levels in the brain and a functional “floor” that limits the impact of further inhibition (Rueter et al. 1997; Gonzalez et al. 2003; Tao and Ma 2012). Based on this prior experience and the consistent lack of behavioral effects following inhibitory manipulations in our hands, we focused our resources on Gq-mediated activation in the present work.

    Involvement of the dorsal raphe serotonin system in basal and punished heroin self-administration and stress-induced reinstatement in male and female rats · 2026 · DOI

  • The sample size for behavioral experiments was determined by the current standard used for mice in behavioral neuroscience experiments, based on the minimal number of mice required to detect significance with a α rate set to 0.05 in a standard-powered experiment with a statistical power of 80% or better.

    Medial prefrontal cortex neurons integrate amygdala and hypothalamic oxytocin signals to mediate stress-induced social alterations · 2026 · DOI

  • Yet, little is known about the biological processes that determine how we learn to accept a particular social behaviour as the most appropriate, and even less is available to highlight the deepest levels/reasons that motivate the trade-off between the daily practice of individual habits and the processes involved in conforming them to such codified social expectations as norms are.

    How Individual Habits Fit/Unfit Social Norms: From the Historical Perspective to a Neurobiological Repositioning of an Unresolved Problem · 2018 · DOI

  • Although it was reported that ICR (Institute of Cancer Research) mice exhibited an unchanged baseline performance in the training phase of the MWM task, this outbred strain has been widely used in learning and memory studies, and little is known regarding the effects of sex on behavioral performance.

    Sex Differences in ICR Mice in the Morris Water Maze Task · 2013 · DOI

  • Studies in mammals have implicated the neuropeptide oxytocin (OT) in processes of bond formation and stress modulation, yet the involvement of OT in human bonding throughout life remains poorly understood.

    Maternal and paternal plasma, salivary, and urinary oxytocin and parent–infant synchrony: considering stress and affiliation components of human bonding · 2010 · DOI

  • Recently, we developed two Oxtr knockout lines: a total body knockout (Oxtr-/-) and a conditional Oxtr knockout (OxtrFB/FB) in which the Oxtr is lacking only in regions of the forebrain, allowing knockout females to potentially nurse and care for their biological offspring.

    Normal maternal behavior, but increased pup mortality, in conditional oxytocin receptor knockout females. · 2010 · DOI

  • The preoptic area (POA) is critical for maternal behavior in rats but little is known about what neurotransmitters released here influence maternal responding.

    Dopamine D1 and D2 Receptor Antagonism in the Preoptic Area Produces Different Effects on Maternal Behavior in Lactating Rats. · 2005 · DOI

  • But although many different publications have followed the contribution of Heimer and Larsson there is no agreement as to what is specifically the role of the MPOA/AH in sexual behavior.

    Medial preoptic area/anterior hypothalamus and sexual motivation · 2003 · DOI

  • From the literature reviewed, it will become evident that the evidence supporting a role of the MPOA/AH in the execution of sexual behavior is based on a number of limited studies not easy to interpret.

    Medial preoptic area/anterior hypothalamus and sexual motivation · 2003 · DOI

  • By acutely depriving dams of various aspects of perioral stimulation from pups (with anesthesia of the mystacial pads or of the tongue, with mouth suturing, or with muzzling), we found the following: (1) Distal stimulation from pups maintains proximity-seeking behavior, but is insufficient to stimulate nursing behavior.

    Perioral somatosensory determinants of nursing behavior in Norway rats (Rattus norvegicus). · 1989 · DOI

  • Miller's (1960) study of this phenomenon, referred to above in connection with the concept of filtering, is illustrative of the all too limited evidence we have on this point, and on the mechanisms utilized by the individual to cope with this kind of overload.

    Human adaptation to levels of environmental stimulation · 1974 · DOI

  • Further investigation of such spontaneous behavior should prove profitable, and might lead to a better understanding of what is now typically called "drive," and its relation to extero- ceptively stimulated behavior. Further studies on the development of somatic activity in albino rat fetuses.

    An Experimental Study of the onset of Behavior in the Fetal Guinea-Pig · 1935 · DOI

  • the non-exteroceptive process utilized by the above animals was pro- prioception remains to be determined. T h e non-exteroceptive process utilized by the few animals who do not normally utilize vision, olfaction, or audition, and by those animals who can re-acquire the habit in the absence of extero- ceptive stimulation, remains to be identified. T h e exact nature of the r81e of vision and olfaction in this maze habit remains to be determined. Whether the normal sensory control of the type of maze the ordinarily employed in animal experimentation is like that of double-alternation maze remains to be determined. T h e fact that the disturbance on M a z e I1 was not limited to the first few trials immediately following the introduction of the animals to the “variable” situation suggests that the inferior performance on M a z e I1 was not due to a distrac- tive effect of new exteroceptive stimuli.

    The Normal Sensory Control of the Perfected Double-Alternation Spatialmaze Habit of the Albino Rat · 1933 · DOI

  • Significance Statement Ultrasonic vocalizations (USVs) are high-frequency calls produced by rats known to correlated with emotional and motivational states, yet their diversity and functional relevance remain underexplored.

    A subtype of ultrasonic vocalizations during palatable food consumption in rats identified by machine learning-assisted classification · 2026 · DOI

  • Schizophrenia is thought to arise from disrupted postnatal maturation of prefrontal circuits, but the developmental events linking early vulnerability to adult cortical dysfunction remain unclear.

    Early-life medial pulvinar disruption drives schizophrenia-relevant prefrontal inhibitory and cognitive deficits in primates · 2026 · DOI

  • SIGNIFICANCE STATEMENTThe supramammillary region (SuM) has emerged as a critical node linking arousal, threat processing, and motivated behavior, yet the sources and functions of its modulatory inputs remain unclear.

    Orexinergic Input to the Supramammillary Region Links Threat Salience to Approach Behavior and Dopamine Release · 2026 · DOI

  • PTSD and autism spectrum disorder: co-morbidity, gaps in research, and potential shared mechanisms.

    Altered stress and fear responses in the VPA rat model of autism: Behavioral dissociation across tactile, nociceptive, and social contexts · 2026 · DOI

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68 open questions have been extracted from the limitations and future-work passages of 992 Neuroendocrine regulation and behavior papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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