Fig. 3. (A,B) Response of DBNi1-2 to visual stimuli. (A) Light-off stimuli elicited bursts of spikes. Upper trace, stimulus monitor; lower trace, five superimposed sweeps of the intracellular recording. (B) Mapping of responsiveness to visual input. Sensitivity to the presentation of stationary black dots subtending a visual angle of 8° changes over the receptive field of DBNi1-2. Columns represent relative means of the spike counts (± S.E.M., standardised for each experiment, N=5). DBNi1-2 responded best to dots in the dorso-anterior corner of the computer screen. Note that the the size of the screen did not allow the full size of the receptive field of this neuron to be probed (see Materials and methods).