Numerosity adaptation effect

As noted by Burr & Ross (2008): Just as we have a direct visual sense of the reddishness of half a dozen ripe cherries, so we do of their sixishness.

Also, it was suggested that numerosity may be correlated with kurtosis and that the results may be better explained in terms of texture density such that only dots falling within the spatial region where the test is displayed effectively adapt the region.

[5] However, as the display in the original experiments was of spots uniformly either white or black, the kurtosis account is inapplicable.

The texture density explanation doesn't seem to disentangle the complexity of these phenomena as in the display the left field adapts to many dots, the right field to few, and these adapters selectively affect the relevant test stimuli.

[4] At present, why adaptation have such profound effect on numerosity estimates remains largely unexplained.