Sentence structure can influence this process and slow down or speed up how quickly you read. Much as the world doesn’t combine many groups of data into sets greater than seven, every book is structured to accommodate a reader’s restricted attentional space. Sentences have a limited length and are punctuated by commas, semicolons, and dashes.
I've often thought the idea of "readability" is incredibly subjective. Perhaps the missing language for me has been the idea of cognitive chunking and how an idea fits into working memory. There is more to explore here to become a more effective writer.
