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In the domain of motion perception, the implementation of a new pedestal paradigm and some critical subsidiary paradigms (interocular displays, stimulus superpositions with varying phases and directions, alternating-feature stimuli, and attentional manipulations) enabled the measurement in isolation of the spatial and temporal characteristics of the three main human motion perception mechanisms (the so-called first-, second, and third-order systems). The first- and second-order systems, known previously, were now shown to exist in duplicate, having a primarily left eye and a primarily right eye computational branch. Additionally, a purely binocular (third-order) motion mechanism was discovered and measured.