20Â Hz membrane potential oscillations are driven by synaptic inputs in collision-detecting neurons in the frog optic tectum

► Collision-sensitive neurons were blindly patched in a frog eye-tectum preparation. ► The majority (22/26) of tectal layer 6 neurons were η class collision-neurons. ► 20 Hz membrane-potential oscillations were detected in many these neurons (15/22). ► Thus, 'collision' responses may be generated by OFF retinal ganglions cells.