We describe intracranial, local field potentials (LFP) recorded in the anterior cingulate cortex (ACC) of macaque monkeys performing a saccade countermanding task. The most prominent feature at ~70% of sites was greater negative polarity after errors than after rewarded, correct trials. This negative polarity was also evoked in unrewarded, correct trials. The LFP evoked by the visual target was...

We present a computational model to test a "polarity sorting" mechanism for microtubule (MT) organization in developing axons. We simulate the motor-based axonal transport of short MTs to test the hypothesis that immobilized cytoplasmic dynein motors transport short MTs with their plus ends leading, so "mal-oriented" MTs with minus-end-out are transported toward the cell body while "correctly" ...

The coordination of cell proliferation and cell fate determination is critical during development but the mechanisms through which this is accomplished are unclear. We present evidence that the Snail-related transcription factor CES-1 of Caenorhabditis elegans coordinates these processes in a specific cell lineage. CES-1 can cause loss of cell polarity in the NSM neuroblast. By repressing the t...

Solar Vortices," Contributions from the Mount Wilson Observatory, No. 109; Astrophysical Journal, 43, 347 (1916). The electromagnetic theory of solar vortices was developed by Professor Stormer merely as a working hypothesis and not as an expression of his opinion regarding the nature of these phenomena. The legend of figure 9 in Professor St6rmer's article is incorrect: the words "clockwise" a...