Human Eye Aliasing

From Qwiki

Examples of aliasing can be often observed in old film footage of rotating objects, such as bicycle wheels. As the bike wheels spin up to speed they are first observed to rotate in the expected direction. However, as the rotational velocity continues to increase, the wheels actually appear to slow down or even spin in the opposite direction. This can be easily understood as an aliasing effect associated with the camera's fixed frame rate and the wheels rotational rate--if the camera under samples the rotating object, all sorts of crazy stuff can be observed. But why does the human eye do this? It has been pointed out that the unaided human eye will alias the rotation of helicopter blades: starting from rest, the blades appear to spin up as normal, but then appear to slow and spin backwards (Eventually, however, the rotational velocity will get high enough that you see nothing but a blur.) If the synapses associated with vision fired at a fixed, steady rate, and were spatially correlated (as in a movie camera), It would be understandable how the eye would alias a rotating object. But, this simply is not the case. Furthermore, if the rotating object were being illuminated by a stroboscopic source, one could easily image how the aliasing could result; but as far as we know, the sun is not a pulsar.

Or does aliasing occur at all?