Q:

Translation of a greek word in Stoic thought

I'm reading this article on Ariston of Chios. On the 9th page of the article Schofield uses " ἡγεμονιχόν", stating that the "What Ariston had noticed was that, although committed to a plurality of virtues, the Stoics nonetheless were content to identify just one condition of the  ἡγεμονιχόν as constituting ενφνια, excellence of natural endowment."
What does this greek word translate to in English? I suspect that it is something like "commanding faculty of the soul", but I'd like to be sure.

A:

According to the Stoic theory, there are eight parts of the soul, the "commanding faculty","ἡγεμονιχόν", or mind, the five senses, voice and certain aspects of reproduction. The mind, which is located at the heart, is a center that controls the other soul-parts as well as the body, and that receives and processes information supplied by the subordinate parts. 

