Word recognition the integration of the different kinds of information occurs. The accuracy with which readers recognize words depends on the area of the retina that is stimulated. Reading in English selectively trains specific regions of the left hemiretina for processing this type of visual information, making this part of the visual field optimal for word recognition. As words drift from this optimal area, word recognition accuracy declines. Because of this training, effective neural organization develops in the corresponding left cerebral hemisphere. Eyes make brief, unnoticeable movements called saccades approximately three to four times per second. Saccades are separated by fixations, which
Bixby letter imitate Lincoln's handwriting, calling it "halting and awkward and makes his forceful hand appear like a child's scrawl". Tobin's facsimile also errs when compared to the original text of the letter published in Boston newspapers; adding the salutation "To Mrs Bixby, Boston Mass", misspelling the word "assuage" as "assauge", omitting the word "to" after the word "tendering", changing the plural "words" into "word", not capitalizing the words "freedom" and "republic", missing the recipient "Mrs. Bixby" on the bottom left, and combining the original three paragraphs into one. Huber's Museum corrected the spelling of "assuage" in their version of the facsimile.