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Barrels then communicate through intracortical circuitry to integrate input from multiple whiskers and perform processing functions such as spatial filtering, motion sensing, and object localization. To investigate the circuits that enable barrels to communicate independently of extracortical and inter-areal influences, we prepared slices of somatosensory cortex from mice of both sexes with a hybrid voltage sensor (hVOS) targeted to Scnn1a excitatory neurons in cortical layer 4 (L4). We then imaged voltage responses of this population of neurons to electrical stimulation. Imaging tracked activity initiated in L4 of one barrel spreading into layer 2\/3 (L2\/3) and then to L4 of neighboring barrels. AMPA receptor blockade eliminated this spread, suggesting that L4 signaling to neighboring barrels employs an L4\u2192L2\/3\u2192L4 excitatory synaptic relay. Blocking AMPA receptors also enhanced some responses, revealing intra- and inter-barrel feedforward inhibition. Both coronal and sagittal slices presented the layout of barrels, which aligned with facial whisker organization. We assessed inter-barrel communication in different directions and found it to be isotropic in response amplitude, half-width, and conduction velocity. However, latency was longest for communication to caudal barrels. Furthermore, paired-pulse depression was strongest and recovery slowest for inter-barrel communication related to exploratory protraction. Such biases have the potential to contribute to direction-sensitive processing. Anisotropy in short-term plasticity can tune BC microcircuits to preserve temporal fidelity and filter selectively according to direction.<\/jats:p>","DOI":"10.1523\/eneuro.0109-26.2026","type":"journal-article","created":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T17:50:19Z","timestamp":1787939419000},"page":"ENEURO.0109-26.2026","update-policy":"https:\/\/doi.org\/10.1523\/eneuro.crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Biased Inter-columnar Communication and Short-Term Plasticity in Mouse Barrel Cortex"],"prefix":"10.1523","volume":"13","author":[{"given":"John M.","family":"Judge","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2904-7091","authenticated-orcid":false,"given":"Meyer B.","family":"Jackson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"393","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.1","doi-asserted-by":"publisher","DOI":"10.1038\/nature08935"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.2","doi-asserted-by":"publisher","DOI":"10.3389\/fnsys.2019.00040"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.3","doi-asserted-by":"crossref","first-page":"RP107099","DOI":"10.7554\/eLife.107099.4","article-title":"Local inhibitory dynamics underpin temporal integration and functional segregation between barrels and septa in the mouse barrel cortex","volume":"14","author":"Argun\u015fah","year":"2026","journal-title":"Elife"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.4","doi-asserted-by":"publisher","DOI":"10.1152\/jn.1992.68.4.1345"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.5","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.1363-17.2017"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.6","doi-asserted-by":"publisher","DOI":"10.1080\/0899022021000037809"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.7","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6123(08)62611-4"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.8","doi-asserted-by":"publisher","DOI":"10.1093\/cercor\/bhac403"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.9","doi-asserted-by":"publisher","DOI":"10.1038\/nn1558"},{"key":"2026091111251646000_13.9.ENEURO.0109-26.2026.10","doi-asserted-by":"crossref","unstructured":"Chang P (2006) Heterogeneous spatial patterns of long-term potentiation in hippocampal slices. 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