Hyperacuity and Obligatory Looking

Beginning about four months of age, the perception of detail takes another leap forward with the emergence of hyperacuity: the ability to discriminate features that are up to ten times finer than the size of the photoreceptors should theoretically permit. It is this ultrafine discrimination that allows us, for instance, to see a very slight glitch in an otherwise straight line. even though the size of the glitch is below our eyes' limit of resolution. It is not yet known how our brains perfor...

 Instinctual Breastfeeding

From an evolutionary point of view, it would seem that last-feeding should be one of the more instinctual behaviors, like eating or sleeping or sex. In most mammals, if mothers don't know how to offer their milk or babies don't know how to suckle, the infant dies. If die purpose of reproduction is to pass on genes, it would seem that feeding would be one of the more hard-wired biological behaviors. In explanation, Wiessinger offered this story: A female gorilla, born and raised in a zoo, gave...

 Exercise is Good for the Fetus

May conducted a study of the effects of maternal exercise on the fetus. Comparing sedentary pregnant women to those who engage in moderate-intensity aerobic exercise for at least thirty minutes three times a week, May found that fetuses show the same beneficial effects of cardiovascular training as do their physically active mothers: their heart rates are significantly lower, and their heart-rate variability is greater, than those of fetuses of mothers who don’t exercise. [...] Exercise m...