If, finally, turn to the cells responding to the ends of lines, here we find a less stringent restrictions on the exact position of the stimulus (although each this configuration will enable much smaller cells). For this type of neuron circuit orientation must always coincide with the optimal orientation of the excitatory receptive field area, but should vary significantly outside of this area, to offset the braking is not excitement. In short, the circuit area must be of sufficient curvature abruptly interrupted or that all conditions for the excitation of the cells (see. Fig. 56) have been complied with.