ELLIOTT M. BLASS Fifteen years have passed since the first volume on
developmental psychobiology (Blass, 1986) appeared in this series and 13
since the publication of the second volume (Blass, 1988). These volumes
documented the status of the broad domain of scientific inquiry called
developmental psychobiology and were also written with an eye to the
future. The future has been revolutionary in at least three ways. First,
there was the demise of a descriptive ethology as we had known it, to be
replaced first by sociobiology and later by its more sophisticated
versions based on quantitative predictions of social interactions that
reflected relatedness and inclu- sive fitness. Second, there was the
emergence of cognitive science, including cogni- tive development, as an
enormously strong and interactive multidisciplinary effort. Making the
"functional" brain more accessible made this revolution all the more
relevant to our discipline. In the laboratory, immunocytochemical
detection of immediate / early genes, such as los, now allows us to
trace neuronal circuits activated during complex behaviors. The
"functional" brain of primates, especially humans, was also made very
accessible through neuroimaging with which we can look at and into
brains as they solve and attempt to solve particular tasks. Those of us
who were trained in neurology as graduate students two or three decades
ago recognize only the people in white coats and patients in beds or on
gurneys when we visit neurologi- cal units today. The rest is
essentially new.