Summary: New research from the University of Minnesota shows that many different cortical regions share a common, modular organization during early development rather than being pre-specified for distinct functions. Using advanced optical imaging, the team found that neurons across sensory and association areas organize into synchronized, millimeter-scale networks. This discovery points to a universal early blueprint for cortical development and has important implications for understanding neurodevelopmental disorders such as autism and schizophrenia.
By recording spontaneous activity across multiple brain regions, researchers observed repeated patterns of synchronized activity among local groups of neurons. These small coordinated ensembles sit within larger functional networks that span millimeters across the cortical surface. The presence of this modular organization in both sensory areas (vision, hearing, touch) and in higher-order, non-sensory regions (including prefrontal cortex) suggests a shared developmental framework from which later specializations emerge.
Key Facts:
- Shared early organization: Multiple cortical areas—sensory and association—exhibit a similar modular structure in early development, indicating a single, common blueprint guiding initial cortical formation.
- Relevance to neurodevelopmental disorders: Because many disorders affect multiple brain regions, a common early organization implies that disruptions to this shared developmental pattern could underlie widespread functional problems seen in conditions like autism and schizophrenia.
- Unexpected findings outside sensory cortex: Modular, synchronized neuronal ensembles—previously well described in visual cortex—were also found in non-sensory areas such as the prefrontal cortex, challenging assumptions about early regional specialization.
Source: University of Minnesota
Study overview: In a study published in Proceedings of the National Academy of Sciences (PNAS), investigators from the University of Minnesota Medical School examined how different cortical areas develop before sensory inputs like sight and hearing become active. Rather than finding distinct, area-specific organizations at early stages, they observed a consistent modular pattern across diverse cortical regions. This suggests that the cortex may begin with a shared architecture that later adapts to support specialized functions.
“Throughout life, the brain continually builds on foundations set earlier in development. The strong similarity in early organization across very different brain areas suggests that neurodevelopmental disorders—which affect many parts of the nervous system—may act on common developmental mechanisms,” said Gordon Smith, Ph.D., assistant professor at the University of Minnesota Medical School and the study’s principal investigator. Dr. Smith is a member of the Medical Discovery Team on Optical Imaging and Brain Science.
The team collaborated with the Frankfurt Institute of Advanced Studies and used state-of-the-art optical imaging methods—two-photon and widefield calcium imaging—to record spontaneous neuronal activity in young ferrets. They focused on periods seven to fourteen days before eye and ear opening, a developmental window when sensory-driven activity has not yet dominated cortical patterns. During this period, spontaneous activity revealed organized, modular networks across primary sensory areas (auditory and somatosensory cortices) and association regions (posterior parietal and prefrontal cortices).
At the cellular level, researchers observed strong correlations among local populations of neurons in all examined areas. These correlated groups formed small synchronized modules that were themselves components of broader networks spanning millimeters of cortical tissue. The similarity of this organization to that previously documented in primary visual cortex indicates that common design principles likely guide the initial formation of diverse cortical representations.
Finding this modular architecture in non-sensory cortex—including prefrontal regions involved in planning and executive function—was particularly notable. The result challenges the notion that higher-order areas begin development fundamentally different from primary sensory regions; instead, they appear to start from the same distributed, modular template and diverge later as sensory experience and connectivity shape function.
Future work will extend these observations by sampling additional cortical areas and developmental time points to map how the shared blueprint changes as circuits mature and sensory inputs arrive. Understanding the timeline and mechanisms that transform a common early architecture into specialized adult circuits will be important for identifying when and how developmental disruptions produce widespread functional deficits.
Funding: This project was supported by the National Institutes of Health’s National Eye Institute [R01EY030893-01], the Whitehall Foundation, the National Science Foundation, and Germany’s Federal Ministry of Education and Research.
About this neurodevelopment research news
Author: Alexandra Smith
Source: University of Minnesota
Contact: Alexandra Smith – University of Minnesota
Image: The image is credited to Neuroscience News
Original research (open access): “Common modular architecture across diverse cortical areas in early development” by Gordon Smith et al., PNAS. The paper reports spontaneous activity recorded with two-photon and widefield calcium imaging that reveals a distributed, modular cortical organization in early development across sensory and association areas.
Abstract (summary):
Common modular architecture across diverse cortical areas in early development
Animals develop diverse neural representations across cortical areas to handle complex environments, from unimodal sensory inputs to higher-order representations of goals and motivation. Whether this diversity originates from area-specific processes early in development or emerges from a shared organization has been unclear. Using spontaneous activity recorded with two-photon and widefield calcium imaging in ferrets, the study found that prior to sensory onset, both sensory (A1, S1) and association areas (PPC, PFC) exhibit a highly similar modular organization. Modular activity is distributed across the cortical surface and forms functional networks with millimeter-scale correlations, and strong local correlations among neurons are present in all areas. These findings support a model in which diverse cortical representations initially develop from common design principles.