## Correction to Table 1 of our paper "Linked regularities..."
(Science, 1995)

### Richard B. Darlington and Barbara L. Finlay

December 7, 1995
Several readers have called to our attention a noteworthy error
in Table 1 of our paper "Linked regularities in the development
and evolution of mammalian brains" (Science 268:1578-1584,
1995). In that table we inadvertantly gave the regression
statistics that are found when logged individual brain parts are
predicted from the first principal component of the logged parts,
while stating in the table's legend that the predictor was logged
raw brain size. These latter two variables correlate .9980 with
each other, but differ substantially in mean and standard
deviation, thus making the figures in our Table 1 completely
wrong when taken individually. The situation is saved
somewhat by the fact that the regression slopes are at least
proportional to the correct values. Thus for instance when
Table 1 states that the slopes predicting paleocortex and
neocortex are respectively .249 and .445, you can at least tell
from those numbers that the ratio of the two relevant regression
slopes in our Figure 1 is 1.79.
The correct figures are given below, where "a" is the
additive constant in a simple regression, "b" is the regression
slope, and "r" is the correlation. In each case the natural log of
the structure shown is predicted from the natural log of total
brain size.

Corrected Values for Table 1
STRUCTURE | a | b | r |

Medulla | -0.365 | .716 | .991 |

Cerebellum | -1.563 | .947 | .995 |

Mesencephalon | -0.963 | .736 | .990 |

Diencephalon | -2.239 | .954 | .997 |

Paleocortex | -0.384 | .685 | .963 |

Schizocortex | -2.273 | .805 | .985 |

Hippocampus | -1.204 | .775 | .983 |

Neocortex | -3.079 | 1.238 | .995 |

Septum | -2.875 | .771 | .988 |

Striatum | -2.862 | .980 | .997 |

Olfactory bulb* | -0.022 | .454 | .704 |

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*Not in published Table 1
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