Elevating community-driven socioecological participation and action: A case study with Black youth.

Context is important when considering how racism acts to harm Black youth. Hence, social scientists developed socioecological theories that consider both the individual and the context(s) which shapes them. We used these theories to make sense of the challenges facing Black youth and identify points for intervention. However, these theories were rarely shared with community participants. Theory, at its core, is a way to make sense of the world. Theory shared in an age-appropriate manner can help youth make sense of their experiences in a way that promotes psychological wellness. This paper describes the intentional sharing of socioecological theory with community members engaged in two community-based mental health programs. Our team has collaborated closely with community stakeholders to implement and iteratively improve these programs. This first-person account presents the doctoral students' experiences in engaging community members in using socioecological theory to improve the programs with which they have identified as useful to their community. The article underscores the importance of elevating community voices when engaging in community-based research and how that engagement is more fundamental as programs become well-established.

The Needs of Adolescents and Young Adults with Chronic Illness: Results of a Quality Improvement Survey.

Adolescent and young adults (AYAs) with chronic illnesses cope with complex issues that require unique psychological support and healthcare services to reduce psychosocial difficulties, improve disease management, and facilitate positive transitions to adult care. Engaging patients and caregivers can help providers understand the specific needs of this population and identify the perceived areas of support. The purpose of this quality improvement initiative is to assess the needs of AYAs with chronic medical conditions at a large government research hospital. Eighty-nine AYA patients (age = 23.5 years; range 13-34) with neurofibromatosis type 1, cancer, primary immunodeficiencies, or sickle cell disease, and a sample of caregivers (n = 37, age = 52 years; range: 41-65), completed an anonymized survey that assessed their preferences for a wide range of informational and service-related needs. The results indicate an overwhelming desire for information about general health and wellbeing and disease-specific medical knowledge. The most endorsed item was the need for more information about an individual's medical condition (72%), which was a primary concern across disease, racial, and gender groups. Demographic and disease-specific needs were also identified. Thus, providing information to AYA patients and caregivers is a critical and largely unmet component of care, which requires the development and implementation of targeted educational and psychosocial interventions.

Distinct "driving" versus "modulatory" influences of different visual corticothalamic pathways.

Higher-order (HO) thalamic nuclei interact extensively and reciprocally with the cerebral cortex. These corticothalamic (CT) interactions are thought to be important for sensation and perception, attention, and many other important brain functions. CT projections to HO thalamic nuclei, such as the visual pulvinar, originate from two different excitatory populations in cortical layers 5 and 6, whereas first-order nuclei (such as the dorsolateral geniculate nucleus; dLGN) only receive layer 6 CT input. It has been proposed that these layer 5 and layer 6 CT pathways have different functional influences on the HO thalamus, but this has never been directly tested. By optogenetically inactivating different CT populations in the primary visual cortex (V1) and recording single-unit activity from V1, dLGN, and pulvinar of awake mice, we demonstrate that layer 5, but not layer 6, CT projections drive visual responses in the pulvinar, even while both pathways provide retinotopic, baseline excitation to their thalamic targets. Inactivating the superior colliculus also suppressed visual responses in the same subregion of the pulvinar, demonstrating that cortical layer 5 and subcortical inputs both contribute to HO visual thalamic activity-even at the level of putative single neurons. Altogether, these results indicate a functional division of "driver" and "modulator" CT pathways from V1 to the visual thalamus in vivo.

Epigenomic diversity of cortical projection neurons in the mouse brain.

Neuronal cell types are classically defined by their molecular properties, anatomy and functions. Although recent advances in single-cell genomics have led to high-resolution molecular characterization of cell type diversity in the brain1, neuronal cell types are often studied out of the context of their anatomical properties. To improve our understanding of the relationship between molecular and anatomical features that define cortical neurons, here we combined retrograde labelling with single-nucleus DNA methylation sequencing to link neural epigenomic properties to projections. We examined 11,827 single neocortical neurons from 63 cortico-cortical and cortico-subcortical long-distance projections. Our results showed unique epigenetic signatures of projection neurons that correspond to their laminar and regional location and projection patterns. On the basis of their epigenomes, intra-telencephalic cells that project to different cortical targets could be further distinguished, and some layer 5 neurons that project to extra-telencephalic targets (L5 ET) formed separate clusters that aligned with their axonal projections. Such separation varied between cortical areas, which suggests that there are area-specific differences in L5 ET subtypes, which were further validated by anatomical studies. Notably, a population of cortico-cortical projection neurons clustered with L5 ET rather than intra-telencephalic neurons, which suggests that a population of L5 ET cortical neurons projects to both targets. We verified the existence of these neurons by dual retrograde labelling and anterograde tracing of cortico-cortical projection neurons, which revealed axon terminals in extra-telencephalic targets including the thalamus, superior colliculus and pons. These findings highlight the power of single-cell epigenomic approaches to connect the molecular properties of neurons with their anatomical and projection properties.

Context-dependent and dynamic functional influence of corticothalamic pathways to first- and higher-order visual thalamus.

Layer 6 (L6) is the sole purveyor of corticothalamic (CT) feedback to first-order thalamus and also sends projections to higher-order thalamus, yet how it engages the full corticothalamic circuit to contribute to sensory processing in an awake animal remains unknown. We sought to elucidate the functional impact of L6CT projections from the primary visual cortex to the dorsolateral geniculate nucleus (first-order) and pulvinar (higher-order) using optogenetics and extracellular electrophysiology in awake mice. While sustained L6CT photostimulation suppresses activity in both visual thalamic nuclei in vivo, moderate-frequency (10 Hz) stimulation powerfully facilitates thalamic spiking. We show that each stimulation paradigm differentially influences the balance between monosynaptic excitatory and disynaptic inhibitory corticothalamic pathways to the dorsolateral geniculate nucleus and pulvinar, as well as the prevalence of burst versus tonic firing. Altogether, our results support a model in which L6CTs modulate first- and higher-order thalamus through parallel excitatory and inhibitory pathways that are highly dynamic and context-dependent.