The phrase "internal thought" is correct and usable in written English.
It can be used to refer to the thoughts or reflections that occur within a person's mind, often in a narrative or psychological context.
Example: "As she sat in the café, her internal thought was consumed by the decision she had to make."
Alternatives: "inner dialogue" or "private reflection".
This suppression of internal mental activity are thought to enable the reallocation of attentional resources from internal thought processes to goal-directed behavior [21].
"Sometimes our internal thought processes are not working in our favor," he said.
Playing Rusty, Ari James is impressive on the boy's broken physicality, but vocally monotonous - particularly when conveying internal thought.
The study found that a vast majority assumed the stick had its own goals and internal thought processes.
He is not a particularly good listener, and he aims to win every argument, preferably by taking the most contrarian stance possible, like arguing that language evolved not for communication but for internal thought.
The narrator of his story Good Old Neon puts forward the most extreme version of this belief, complaining that even a small portion of our internal thought process "is just too fast and huge and all interconnected for words to do more than barely sketch the outlines of at most one tiny little part of it at any given instant".
The story is narrated in what people call the "close third person"—that is, although Carl is referred to as "he," what we read are, for the most part, his internal thoughts and responses to the world around him.
"No guy expects to come home and won't be able to satisfy his wife, his girlfriend — and still have the same internal thoughts and feelings, and just no external way to express them.
The hurricane works as the perfect physical manifestation of the character's internal thoughts and feelings: "Cliff rolled over and looked towards the girl in the dark, where she was lying on the dead fluorescent bulbs.
But Shadow Chancellor George Osborne told the channel: "We have found out the Prime Minister's internal thoughts and I think they speak for themselves and the Prime Minister has got a lot of explaining to do.
In the book of Bring Up the Bodies, for example, the first encounter between Cromwell and Anne Boleyn, in which they joust for power while discussing her unborn child, runs to six pages, in which we know the internal thoughts and distractions (other business) of him, but only the external reactions of her: blushes, scowls, sighs.
