A pronoun problem

a pronoun problem

The passage below is from ‘the Blank Slate’ by Steven Pinker.

http://evolbiol.ru/blankslate/blankslate.htm

The problem lies in the credo that one can do everything with a generic model as long as it is sufficiently trained. Many modelers have beefed up, retrofitted, or combined networks into more complicated and powerful systems. They have dedicated hunks of neural hardware to abstract symbols like “verb phrase” and “proposition” and have implemented additional mechanisms (such as synchronized firing patterns) to bind them together in the equivalent of compositional, recursive symbol structures. They have installed banks of neurons for words, or for English suffixes, or for key grammatical distinctions.

In this passage I am not sure about what the underlined 'them' stand for.
It seems to refer to both 'hunks of neural hardware' and 'additional mechanisms.'

Am I right?

Regards.