Perceptual Constraints and Cerebral Organization Essay Exam

Perceptual Constraints and Cerebral Organization Essay Exam

Discuss how perceptual constraints and cerebral organization influence how words are recognized during reading.

The act of reading text may appear to be a static action involving a minimal amount of activity, but every turn of the page requires the human brain to engage a veritable concert of cognitive processing. While seemingly instantaneous, reading just a single word combines the eye's ability to fixate and project visual information with the brain's interpretive power, enabling an experienced reader to synthesize wide swaths of textual data in the proverbial blink of an eye. As empirical psychological inquiry has revealed many of the mysteries hidden within the human brain, cognitive researchers have developed a more complete understanding of the perceptual and cerebral processes which are essential to man's unique ability to decipher meaning from an organization of symbols. Concurrently, the spectrum of anatomical knowledge has been significantly expanded through the advent of microscopic exploration, and today the study of vision enables researchers to examine the structural components of the eye itself. By combining these diverse fields of inquiry, two competing schools of thought have emerged regarding the fovea centralis -- an area of the eye located in the center of the macula region of the retina that is crucial for sharp central vision used in reading. Proponents of the split fovea theory (SFT) assert that "that the fovea is anatomically and functionally divided down the middle, with all visual information that originates to the left of fixation projecting initially to the right cerebral hemisphere while all visual information that originates to the right of fixation projects first to the left cerebral hemisphere" (Ellis & Brysbaert, 2010). Conversely, the traditionally held bilateral projection theory (BPT) "proposes that while information presented in the left and right visual fields outside the fovea projects to the right and left hemispheres respectively, foveal information is projected simultaneously to both hemispheres" (Ellis & Brysbaert, 2010). A review of the prevailing research concerning both split fovea theory and bilateral projection theory is a useful exercise in assessing how perceptual constraints and cerebral organization influence how words are recognized during reading.

One of the crucial challenges encountered during the course of research into visual word recognition concerns the hemispheric processing used by the brain to decipher retinal images. As elucidated by researchers Timothy R. Jordan and Kevin B. Paterson, "it has been known for many years that a fundamental determinant of this processing is the anatomical arrangement of the human visual system which causes information in each visual hemifield to project to the contralateral hemisphere" (2009), and comprehending the brain's ability to interpret textual information on a hemispheric level has emerged as a priority within the field of perceptual studies. In particular, the role that hemispheric processing plays in foveal vision has come under intense scientific scrutiny, with proponents of split fovea theory asserting that "if this theory of word recognition is correct, different parts of fixated words would be processed (at least initially) by different hemispheres and this would represent a major contribution to our understanding of the processes responsible for word recognition" (Jordan & Paterson, 2009). The implications of continued research on the subject of split fovea theory and the perceptual basis of word recognition are wide ranging indeed, as several distinct fields of inquiry would undoubtedly be refined, including the study of learning disabilities such as dyslexia and hyperlexia, the teaching of language absorption techniques, and the administration of reading comprehension assessments.

The foveal region is essential to the uniquely human act of reading text, which is why settling the debate between split fovea theory and bilateral projection theory is widely considered a matter of urgency within the field of perceptual research. According to Trevor A. Harley's pioneering research on the subject -- published within his seminal textbook The Psychology of Language: From Data to Theory -- the human brain's incredible efficiency in terms of extracting meaning from an arrangement of textual symbols is directly linked to the foveal region. As Harley explains the significance of this crucial connection, "for a word to be processed properly, its image has to land close to the fovea and stay there for a sufficient length of time & #8230; (and) if both the foveal and parafoveal regions are masked, virtually no reading is possible" (2001). For proponents of the practice known as "speed reading" -- during which speed readers purportedly absorb upwards of 2,000 words per minute, or a sizable increase over the average reading speed of 200-350 words per minute -- our increased understanding of the foveal region's role in reading comprehension may threaten to invalidate a widely held technique. Researchers have long suspected that speed reading is not nearly as effective in terms of reading comprehension as advocates claim, and the expanded base of knowledge which currently exists on split foveal theory indicates that speed readers are simply "skimming" over a large assemblage of textual characters, allowing the fovea to engage in repeated acts of recognition without ever truly effecting comprehension.

The role of the foveal region in binocular vision has also been studied more frequently in recent years, as research continues to confirm the efficacy of the split fovea theory approach to reading comprehension. In a study titled "Binocular Coordination During Reading and Non-Reading Tasks," which was published within the scholarly journal Psychological Bulletin in 2008, a team of researchers conducted a thorough review of the prevailing literature on binocular coordination during reading tasks for adult, child and dyslexic subjects. Upon concluding their literature review, the researchers ultimately determined "that findings from traditionally independent areas of research are largely consistent and complementary" (Kirkby et al., 2008) with the perceptual framework of split foveal theory.