Incidental and probability learning (PL) paradigms were combined to study unintentional processing of probability information. In a PL task Ss received differential training experiences prior to a Test condition of predicting die background colour (green or yellow) of 200 slide presentations of up and down shapes. The two colour and shape values varied on separate 70-30 probability schedules. Colour discrimination reflected by Ss' predictions during Testing was facilitated reliably by Training conditions in which Ss predicted the occurrences of up and down shapes covarying incidentally with green and yellow backgrounds on 70-30 probability distributions. The method of combining the binary dimensions during Training (i.e., concomitant or independent) did not significantly influence the degree of incidental perceptual learning demonstrated.