The cell-type-specific spatial organization of the anterior thalamic nuclei of the mouse brain.

Understanding the cell-type composition and spatial organization of brain regions is crucial for interpreting brain computation and function. In the thalamus, the anterior thalamic nuclei (ATN) are involved in a wide variety of functions, yet the cell-type composition of the ATN remains unmapped at a single-cell and spatial resolution. Combining single-cell RNA sequencing, spatial transcriptomics, and multiplexed fluorescent in situ hybridization, we identify three discrete excitatory cell-type clusters that correspond to the known nuclei of the ATN and uncover marker genes, molecular pathways, and putative functions of these cell types. We further illustrate graded spatial variation along the dorsomedial-ventrolateral axis for all individual nuclei of the ATN and additionally demonstrate that the anteroventral nucleus exhibits spatially covarying protein products and long-range inputs. Collectively, our study reveals discrete and continuous cell-type organizational principles of the ATN, which will help to guide and interpret experiments on ATN computation and function.

Multisystemic Resilience and Psychosocial Wellbeing among Older Refugees: A Systematic Review with Implications for Mental Health and Psychosocial Support (MHPSS).

Older refugees experience poor mental and emotional health outcomes compared to younger counterparts. Although older adults are instrumental in family/community adjustment in postmigration settings, little is known about how to enhance psychosocial resilience in this population. The aim of this systematic review is to glean deeper insight into the protective factors and processes associated with older refugees' resilience and positive psychosocial health in postmigration settings. We searched eight electronic health and social science databases. Twenty-three articles met the criteria for inclusion; we analyzed these using a multisystemic resilience lens. Studies spanned 1991 to 2022; importantly, 15 of the 23 articles were published in the past decade, indicating growing attention to the mental and psychosocial health of older refugees. Only six of the included articles focused on older refugees living in low- and middle-income countries, revealing a contrast between where most of the world's refugees reside and where the majority of mental health and psychosocial support (MHPSS) research is conducted. We found tremendous variation in determinants of psychosocial resilience based on the politico-historical contexts of migration; sociocultural backgrounds of refugees; and distinct postmigration needs, resources, and settings. Broadly, macrosystem determinants of resilience included security, access to basic services, and maintenance of culture and spirituality. Mesosystem factors were related to social support from families, ethnic communities, religious networks, and host country nationals. Finally, microsystem determinants of older refugees' resilience included language acquisition, cognitive reappraisal, and sense of optimism. Our findings suggest the importance of interdisciplinary, multilevel research designs to highlight how multiple ecosystems interact to promote psychosocial resilience among older refugees. Taken together, this systematic review offers important insight into multilevel protective factors and processes to enhance culturally and contextually meaningful MHPSS for older refugees.

Family Sex Trafficking Among the Bedia Caste of India: Defying the Dominant Human Trafficking Discourse.

Largely characterized as an urban issue, empirical studies of minor sex trafficking in rural communities-including India, a global hotspot for child sex trafficking-are exceptionally uncommon. Yet, the commercial sexual exploitation of children thrives in many rural Indian villages, fueled by caste discrimination, family tradition, and poverty. In response, this study aimed to investigate minor sex trafficking among a particular culturally unique and geographically isolated population, in relation to the dominant human trafficking literature. In-depth interviews were conducted with 31 female members of the Bedia caste-a unique population whose primary form of income is derived from participation in the rural sex trade. Framed by the social theory of intersectionality, we sought to (1) identify vulnerabilities for commercial sex industry entry among Bedia youth and (2) examine the cultural context of the commercial sex industry among the Bedia, with particular attention to the dominant victim/perpetrator paradigms. Implications for continued research, practice, and policy are included.

Spatially patterned excitatory neuron subtypes and projections of the claustrum.

The claustrum is a functionally and structurally complex brain region, whose very spatial extent remains debated. Histochemical-based approaches typically treat the claustrum as a relatively narrow anatomical region that primarily projects to the neocortex, whereas circuit-based approaches can suggest a broader claustrum region containing projections to the neocortex and other regions. Here, in the mouse, we took a bottom-up and cell-type-specific approach to complement and possibly unite these seemingly disparate conclusions. Using single-cell RNA-sequencing, we found that the claustrum comprises two excitatory neuron subtypes that are differentiable from the surrounding cortex. Multicolor retrograde tracing in conjunction with 12-channel multiplexed in situ hybridization revealed a core-shell spatial arrangement of these subtypes, as well as differential downstream targets. Thus, the claustrum comprises excitatory neuron subtypes with distinct molecular and projection properties, whose spatial patterns reflect the narrower and broader claustral extents debated in previous research. This subtype-specific heterogeneity likely shapes the functional complexity of the claustrum.

Structural Vulnerabilities, Personal Agency, and Caste: An Exploration of Child Sex Trafficking in Rural India.

The commercial sexual exploitation of children (CSEC) is considered normative and expected among some Indian castes. Focusing on the Bedia specifically, we sought to identify factors responsible for the intergenerational continuation of CSEC as well as opportunities for prevention. To this end, three questions were posed, including: (a) What structural factors perpetuate CSEC among the Bedia? (b) What are the mechanisms by which Bedia children enter the commercial sex industry (CSI)? and (c) To what extent do Bedia women have personal agency in exiting the CSI and in keeping their children from entering? Guided by structural vulnerability theory and a phenomenological approach, in-depth interviews were conducted with 31 Bedia women engaged in (or exited from) the CSI. Results indicate that girls as young as 12 are "selected" to enter the CSI; once involved, they carry the burden of familial financial sustainability and exit only comes when they are no longer able to attract paying clients and younger female kin able to assume the primary breadwinner role. Ability to keep female children from entry is minimal. Implications for future research, practice, and policy are discussed.

A Sparse, Spatially Biased Subtype of Mature Granule Cell Dominates Recruitment in Hippocampal-Associated Behaviors.

Animals can store information about experiences by activating specific neuronal populations, and subsequent reactivation of these neural ensembles can lead to recall of salient experiences. In the hippocampus, granule cells of the dentate gyrus participate in such memory engrams; however, whether there is an underlying logic to granule cell participation has not been examined. Here, we find that a range of novel experiences preferentially activates granule cells of the suprapyramidal blade relative to the infrapyramidal blade. Motivated by this, we identify a suprapyramidal-blade-enriched population of granule cells with distinct spatial, morphological, physiological, and developmental properties. Via transcriptomics, we map these traits onto a sparse and discrete granule cell subtype that is recruited at a 10-fold greater frequency than expected by subtype prevalence, constituting the majority of all recruited granule cells. Thus, in behaviors known to involve hippocampal-dependent memory formation, a rare and spatially localized subtype dominates overall granule cell recruitment.