override <it> [refers to?]


Senior Member
South Korea, Han-gul
the pronoun problem

The passage below is from The Blank Slate written by Steven Pinker.

https://books.google.co.kr/books?id=ePNi4ZqYdVQC&pg=PA40&lpg=PA40&dq="can+override+it+and+focus+on+the+information+relevant+to+a+stated+problem"&source=bl&ots=kKvYAlQoRZ&sig=ak5__OOPPc7Ld4PIyEQdrF4b_Vk&hl=en&sa=X&ei=85ZEVbDdDoK3mwWn6IG4Aw&ved=0CCEQ6AEwAQ#v=onepage&q="can override it and focus on the information relevant to a stated problem"&f=false

The upshot is that an urge or habit coming out of one module can be translated into behavior in different ways — or suppressed altogether — by some other module. To take a simple example, cognitive psychologists believe that a module called the “habit system” underlies our tendency to produce certain responses habitually, such as responding to a printed word by pronouncing it silently. But another module, called the “supervisory attention system,” can override it and focus on the information relevant to a stated problem, such as naming the color of the ink the word is printed in, or thinking up an action that goes with the word.

In this passage I’m not sure what the underlined ‘it’ stands for.
At first glance it seems to represent, ‘our tendency’ in the previous sentence.
Am I right? If not, what does it refer to?
Thanks in advance.
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