Fig. 4.

Algorithm-based detection of areal border between PG and PGop in exemplary receptor autoradiographs. Take AMPA as an example, A shows automatic labeling of the position of the statistically defined border (at position 61). B: The position of border between PG and PGop as defined by visual inspection is indicated by white bold line in the corresponding pseudocolor coded autoardiograph. C: The Mahalanobis distances between neighboring blocks of 19 profiles; significant maxima occurred at profile positions 61, which identify the border between areas PG and PGop. D: The significant maxima of varying block sizes (ranging from 12 to 24); it indicates a consistently occurring border between two cortical areas at profile positions 61. Same border on corresponding sections of GABA_A, M₂ and 5-HT_1A receptors are shown below. Note the close resemblance of the position of the borders in different receptor sections.