In the Barlow and Levick model of a motion detector, two inputs are compared in a:

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In the Barlow and Levick model of a motion detector, the mechanism involves comparing two inputs in a way that one input inhibits the other. This is effectively modeled by an "AND NOT" gate (also known as a NAND gate with one input inverted), where the output is true only if the first input is true and the second input is not true, reflecting the inhibitory process of motion detection in this model.

In the Barlow and Levick Model of a Motion Detector