Related Experiment Video
Updated: Aug 5, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
Published on: February 8, 2014
Why the cortical magnification factor in rhesus can not be isotropic
Abstract:
Using the data of Hubel and Wiesel (1974) J. comp. Neurol. 158, 295-306, on macaque, the shape of the operculum of striate cortex (area 17) is calculated from their magnification factor values assuming that the cortical magnification factor is locally isotropic with respect to displacement on the cortical surface (from a fixed point of origin). Using geometric considerations, the shape predicted from the isotropic assumption is inconsistent with the actual shape given by anatomical reconstruction by LeVay, Hubel and Wiesel (1975) J. comp. Neurol. 159, 559-576. Rather the true shape is more consistent with the hypothesis that on the average the magnification factor along a meridian is twice the value as orthogonal to it. Except in the region of the horizontal meridian, this is often the same as assuming that the magnification factor across ocular dominance columns is twice that going parallel to them.
Related Concept Videos
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Disubstituted Cyclohexanes: cis-trans Isomerism
In cyclohexane, the substituents can occupy different positions generating distinct isomers.
Naming Enantiomers
Molecules with Multiple Chiral Centers
Stereoisomerism of Cyclic Compounds
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

