levels. This fits well with the observation that the repul-1998). It remains to be seen, however, whether these or 1133.102, 363–375. tions be in mediating guidance decisions at choice points? Another possible site for this mechanism to operate is at the ventral midline of the CNS. In vertebrates, commissural axon crossing of the ventral midline of the spinal cord is regulated by a combination ...

It has been proposed that there is a perceptual compensation for the difference between the speeds of light and sound. We examined this possibility using a range of auditory-visual tasks, in which performance depends on the relative timing of auditory and visual information, and manipulated viewing distance to test for perceptual compensation. We explored auditory-visual integration, cross moda...

A vast majority of the emails received by people today are machinegenerated by businesses communicating with consumers. While some emails originate as a result of a transaction (e.g., hotel or restaurant reservation confirmations, online purchase receipts, shipping notifications, etc.), a large fraction are commercial emails promoting an offer (a special sale, free shipping, available for a lim...

indifferent incisions, and in two cases where the iris rose above the knife, the complete iridectomies followed the normal course during convalescence. In assessing the relative merits of the two methods of extraction one must consider two factors: (a) the von Graefe method is simple and quick, and has withstood the test of time and usage in many thousands of cases: its drawbacks are known and ...

Evolved traits such as intuitive skills have allowed individuals to quickly evaluate a suitable sexual Having determined that someone is attractive at first sight, an individual may become emotionally attached to that person and communicate their affection via a copulatory gaze, in which the individual gazes into the other person's eyes for many seconds (Fisher, 1992). In this opinion piece, I ...