|Ort||Kruezbergring 40; 37075 Göttingen|
Disinhibition of cortical excitatory cell gate information flow through and between corticalcolumns. The major contribution of Martinotti cells (MC) is providing dendritic inhibition toexcitatory neurons and therefore they are a main component of disinhibitory connections.Here we show by means of optogenetics that MC in layers II/III of the mouse primarysomatosensory cortex are inhibited by both parvalbumin (PV)- and vasoactive intestinalpolypeptide (VIP)-expressing cells. Paired recordings revealed stronger synaptic inputonto MC from PV cells than from VIP cells. Moreover, PV cell input showed frequencyindependentdepression, whereas VIP cell input facilitated at high frequencies. Thesedifferences in the properties of the two unitary connections enable disinhibition with distincttemporal features.