This is a timely opus. Most of us now are too young to remember the
unpleasant ring of a polemic between those who produced "hair-splitting"
parcellations of the cortex (to paraphrase one of O. Vogt's favourite
expressions) and those who saw the cortex as a homogeneous matrix sus-
taining the reverberations of EEG waves (to paraphrase Bailey and von
Bonin). One camp accused the other of producing bogus preparations with
a paint brush, and the other way around the accusation was that of poor
eye-sight. Artefacts of various sorts were invoked to explain the
opponent's error, ranging from perceptual effects (Mach bands crispening
the areal borders) to poor fixation supposedly due to perfusion too soon
(!) after death. I have heard most of this directly from the
protagonists' mouths. The polemic was not resolved but it has mellowed
with age and ultimately faded out. I was relieved to see that Professor
Braak elegantly avoids dis- cussion of an extrememist tenet, that of
"hair-sharp" areal boundaries, which makes little sense in developmental
biology and is irrelevant to neurophysiology. It was actually
detrimental to cortical neuroanatomy, since its negation led to the idea
that structurally distinct areas are not at all existent. Yet, nobody
would deny the reality of five fingers on one hand even if the detailed
assignment of every epidermal cell to one finger or another is obviously
impossible.