Fig. 3

Spread pattern of spontaneous synchronous population activity in disinhibited oblique slices of claustrum. a Multi-channel recording of activity within claustrum and surrounding regions. Although the population activity is confined to claustrum, the activity is present everywhere in claustrum. b Image of brain slice and 64 recording channels (small black dots). Large black dots mark those channels that are within claustrum. R, C, L, M indicate rostral, caudal, medial, and lateral borders of the tissue. EC indicates external capsule. c, d illustrate with higher temporal resolution the spread pattern of a single (initial) spike (c) and the later repetitive population spiking (d). Details of the degree of claustral involvement in synchronous activity and propagation rates appear in the text. Note the different time calibrations for (a), (c), and (d): 200, 10, and 50 ms per division, respectively