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Anatomical and physiological landmarks for the superficial and deep layers of the optic tectum (OT). Superficial layers (1–10) exhibited characteristic bursty spiking activity (upper lesion). Deep layers (12–13) exhibited single, somatic spikes that discharged regularly; bursty activity was negligible or undetectable (lower lesion). Recordings were not made in layer 11 (between the lesions). A.U., arbitrary units; d, dorsal; v, ventral.
