It is commonly assumed that velocity preferences of visual neurons closely reflect the velocity preferences of geniculate neurons which provide their “driving” (Sherman and Guillery, 1998) excitatory input (e.g., Dreher et al., 1980; Orban et al., 1981; Duysens et al., 1982a; for review, see Orban, 1984). However, a substantial proportion of area 19 cells appear to receive Y type afferents from the LGNd (presumably responding to fast moving stimuli) do not respond to fast moving stimuli (Dreher et al., 1980). Similarly, some V1 neurons which receive geniculate afferents reliably activated by fast moving stimuli, presumably due to intracortical inhibition, do not generate action potentials when fast moving stimuli are presented (Goodwin and Henry, 1978). It is also worth noting in this context that: (1) the cut-off and preferred velocities of area 18 neurons tend to be much higher than those of most area 17 neurons (e.g., Dreher et al., 1980; Orban et al., 1981; for review, see Orban, 1984); and (2) reversible inactivation of circumscribed part of layer 5 of area 18 (V2), results in reversible upward shift in cut-off velocities and/or preferred velocities of a large (40%) proportion of layer 5 neurons in the visuotopically corresponding region of area 17 (Alonso et al., 1993a).