Bruce and I now started looking at the effect of differences in the time, as well as the position, at which corresponding features strike the eyes. Bruce recorded the response of V1 neurons to random-dot patterns with both horizontal spatial disparity, and temporal delay. I analysed this data-set, and found that the shape of the disparity tuning curve was largely independent of the delay; delay simply reduced the amplitude. This was contrary to previous reports in the cat (Anzai et al, 2002, Nature Neuroscience), which had emphasised shifts in disparity tuning as a function of delay. However, linear models (like the energy model) would predict that the disparity tuning only shifts in cells which are direction-selective. We showed that the difference between our results and those from cat could be largely explained by the relative paucity of direction-selective cells in the monkey.