bipunctual

— Finally, a study by Verhoeff indicates the possibility of the occurrence of visual apparent movement in the absence of serial bipunctual stimulation of the visual cortex.

— The two systems are, in fact, practically identical; whatever can be proved for or with the one can be proved for or with the other; and it is only their relations to the bipunctual and bilinear systems that the distinction between the tripunctual and the trilinear systems comes into play: tripunctual coordinates standing in the same relation to bipunctual coordinates as trilinear to bilinear .