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160 pages, Paperback
First published October 1, 2011
biology holds one (not the only—by a long shot) approach to understanding critical world issues and that anyone interested enough to pay attention can learn to read and interpret biology with a suitably critical eye. (xi)
How do such preferences develop? Th e old way of looking at the question is to ask is it nature or is it nurture? Do girls love pink because of something inborn about their visual system? Indeed, is pink-loving an expression of brain sex (Alexander, 2003)? Or, maybe boys choose blue because these days we associate blue with masculinity; maybe adults and peers offer negative feedback to boys who go for pink? I think that this way of approaching the problem is flat out wrong. To use an analogy taken from a recent book on the topic written by historian and philosopher of science Evelyn Fox Keller, imagine the trait “I love pink” as a 100 gallon bucket of water. Suppose two people (oh call one Mr. Nature and the other Ms. Nurture) are filling up that bucket with separate hoses. If Mr. Nature added 70 gallons and Ms. Nurture 30, then we could say that the 100 gallons is due 70 percent to nature and 30 percent to nurture. But suppose instead that Mr. Nature supplies the hose, while Ms. Nurture brings the bucket. Then what percentage is due to nature and what to nurture? The truth is, the question doesn’t make any sense (Keller, 2010).
There are better ways to look at this problem. They have different names—dynamic systems, developmental dynamics, developmental systems. But they share a few important features. First, they are developmental; that is to say they examine how a trait comes into being over time. How does a trait develop? Second, they ground themselves in the body—not a fixed body—but one that changes over time. This means that to study a trait one always looks at a set of processes over time. Traits may be fairly stable. But if a trait changes—for example, little girls’ pink preferences often change into preferences for purple or red— it doesn’t start from scratch. Rather new traits build on what is already there. (113)
Why doesn’t the system work for all children? What accounts for all of the individual variability—from some little boys who prefer pink and frilly (at one end of the spectrum) to little girls who prefer reds or blues, to children who really don’t have strong color preferences? Here again we look to developmental systems. To address the problem of individual variability we need more information— information about variations in physical environment, in gender development, in caregiver and peer interactions and attitudes, and in each individual’s physiology (Kegel, Bus, & van Ijzendoorn, 2011). To gather this missing information we have to do studies that follow individual children over extended periods of time, charting the several systems we hypothesize contribute to color preference and identifying stable preference outcomes. Everything from the color of the nursery wallpaper, the rods and cones in the retina, color processing in the brain, the behaviors of parents and others, the timing of gender knowledge and identity development, and individual differences in the molecules important in the dopamine systems contribute to a little girl’s delight in or a little boy’s aversion to the color pink. (117-8)