The role of eye movements in the missing-letter effect revisited with the rapid serial visual presentation procedure.

When participants read a text while searching for a target letter, they are more likely to miss the target letter embedded in frequent function words than in less frequent content words. This effect is usually observed with a text displayed normally, for which it has been found that frequent function words are fixated for a smaller amount of time than less frequent content words. However, similar pattern of omissions have been observed with a rapid serial visual presentation procedure in which words appear one at a time. These parallel results would demonstrate that fixation duration per se is not the proximal cause of the missing-letter effect only if eye movements are not made during the rapid serial visual presentation procedure. Therefore, the authors performed eye monitoring during the rapid serial visual presentation procedure. Results revealed that, with a rapid serial visual presentation procedure, participants fixated function and content words for almost the entire presentation duration. It is concluded that eye movements are not the proximal cause of the missing-letter effect. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reading mutilated text.

Conducted 2 experiments, one with 12 6th graders considered to be good readers and one with 12 junior high and high school students who had normal IQs but were 2 yrs behind on standardized reading scores. Ss read passages of text which had been mutilated by changing the shape of the words and/or the initial, medial, or final letter of words. When the shape had been maintained by replacing letters with letters that shared distinctive features and were visually confusable with them, less reading time was taken and fewer errors were made than when the shape had been altered by replacing letters with letters that were not visually confusable with them. In addition, mutilations to the beginning of a word were considerably more disruptive than mutilations to the middle or end of a word. Good readers and poor readers showed highly similar data patterns. (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

What Do Letter Migration Errors Reveal About Letter Position Coding in Visual Word Recognition?

Dividing attention across multiple words occasionally results in misidentifications whereby letters apparently migrate between words. Previous studies have found that letter migrations preserve within-word letter position, which has been interpreted as support for position-specific letter coding. To investigate this issue, the authors used word pairs like STEP and SOAP, in which a letter in 1 word could migrate to an adjacent letter in another word to form an illusory word (STOP). Three experiments show that both same-position and adjacent-position letter migrations can occur, as well as migrations that cross 2 letter positions. These results argue against position-specific letter coding schemes used in many computational models of reading, and they provide support for coding schemes based on relative rather than absolute letter position. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transposed-letter effects in reading: Evidence from eye movements and parafoveal preview.

Three eye movement experiments were conducted to examine the role of letter identity and letter position during reading. Before fixating on a target word within each sentence, readers were provided with a parafoveal preview that differed in the amount of useful letter identity and letter position information it provided. In Experiments 1 and 2, previews fell into 1 of 5 conditions: (a) identical to the target word, (b) a transposition of 2 internal letters, (c) a substitution of 2 internal letters, (d) a transposition of the 2 final letters, or (e) a substitution of the 2 final letters. In Experiment 3, the authors used a further set of conditions to explore the importance of external letter positions. The findings extend previous work and demonstrate that transposed-letter effects exist in silent reading. These experiments also indicate that letter identity information can be extracted from the parafovea outside of absolute letter position from the first 5 letters of the word to the right of fixation. Finally, the results support the notion that exterior letters play important roles in visual word recognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Exterior letters are not privileged in the early stage of visual word recognition during reading: Comment on Jordan, Thomas, Patching and Scott-Brown (2003).

Potential sources for the discrepancy between the letter position effects in T. R. Jordan, S. M. Thomas, G. R. Patching, and K. C. Scott-Brown's (2003; see record 2003-07955-013) and D. Briihl and A. W. Inhoff s (1995; see record 1995-20036-001) studies are examined. The authors conclude that the lack of control over where useful information is acquired during reading in Jordan et al.'s study, rather than differences in the orthographic consistency and the availability of word shape information, account for the discrepant effect pattern in the 2 studies. The processing of a word during reading begins before it is fixated, when beginning letters occupy a particularly favorable parafoveal location that is independent of word length. Knowledge of parafoveal word length cannot be used to selectively process exterior letters during the initial phase of visual word recognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reading speed in pure alexia

This study investigated possible causes of differences in reading speed between two alexic patients who read words letter by letter. As both patients appeared to rely on serial left-to-right processing of letters within words, the difference in reading speed did not seem to be related to any differences in the extent to which the patients could recognize letters in words in parallel or 'ends-in'. Differences in reading speed also seemed to be unrelated to the patients ability to identify individual letters since their letter recognition accuracy was very similar. Furthermore, although patient PD was significantly slower at reading words aloud than patient DC, PD was in fact significantly quicker than DC on a test that has previously been used to assess letter recognition skills in letter-by-letter readers. It is therefore concluded that PD reads words more slowly because of an additional impairment at the level of the word form system. The results therefore reinforce the distinction between Type 1 and Type 2 letter-by-letter readers that was first drawn by Patterson and Kay.     

Detecting letters in continuous text: Effects of display size.

In three letter detection experiments, subjects responded to each instance of the letter t in continuous text (a) typed in a standard paragraph, (b) typed with one to four words per line, or (c) shown for a fixed duration on a computer screen either one or four words at a time. In the multiword and the standard paragraph conditions, errors were greatest and latencies longest on the word the when it was correctly spelled. This effect was diminished or reversed in the one-word conditions. These findings support a set of unitization hypotheses about the reading process, according to which subjects do not process the constituent letters of a word once that word has been identified unless no other word is in view. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Familiarization effects for bilingual letter detection involving translation or exact text repetition.

In two experiments, English-Spanish bilinguals read passages, performing letter detection on some passages by circling target letters as they read. Detection passages were sometimes familiarized (primed) by prior reading of the same passage or a translation of it. Participants detected letters in English passages in Experiment 1 and in Spanish passages in Experiment 2. For both experiments, a missing letter effect occurred (depressed detection accuracy on frequent function words relative to less frequent content words). Familiarization promoted overall improvements in letter detection only for English passages, suggesting that reprocessing benefits depend on high language fluency. For Spanish passages, cognates engendered greater error rates than noncognates; the visual similarity of Spanish and English cognates apparently enabled faster identification of Spanish cognates in a way unaffected by familiarization of the whole text passage. Priming by familiarized text was significantly higher when the passages were in the same language than when they were in different languages, suggesting that the reprocessing benefits are at the word level instead of the semantic level. These results are consistent with the GO model of reading (Greenberg, Healy, Koriat, & Kreiner, 2004) but require an expanded consideration of attention redistribution processes in that model. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Syllable coding in printed-word recognition by children and adults.

Studied phonological coding in printed-word recognition in English by examining the use made of syllable information by skilled and less skilled readers in 2 experiments using 32 2nd graders and 81 undergraduates. Stimuli were bisyllabic frequent nouns. Syllable coding was used by the less-skilled 2nd graders but not by either the better 2nd graders or adults in lexical decision tasks. However, adults did make use of syllable information when the direct use of letter information was slowed by presenting items in alternating upper- and lowercase letters. Differences between children and adults in their use of the syllable information in pseudowords are interpreted as indicating that for skilled adult readers, the major focus of activity in word recognition is at the letter level. For immature readers, the process of word recognition is less analytic and involves a more extensive lexical search based on a reduced amount of letter information. The results are discussed in terms of an interactive model of reading. (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Letter encoding in visual word identification: More evidence for a word-integration explanation for parafoveal preview effects in reading.

A letter string presented briefly in the parafovea facilitates naming a foveally presented word provided that the two stimuli are orthographically similar. The facilitation is asymmetrical in that to obtain it, both letter strings must have the first letters in common. One possible explanation, a letter-integration hypothesis, proposes that readers only identify the letters at the beginning of the parafoveal stimulus, an action that facilitates processing the target. Another explanation, a word-integration hypothesis, postulates that all the letters of the parafoveal stimulus are identified and that the asymmetry occurs because the first letters of the parafoveal stimulus are weighted more heavily than the later ones. The two accounts differ in the way the position of the first letter is determined. To distinguish the views, English and Hebrew stimuli were presented to 7 bilingual readers. 12 normal students participated as controls. Readers could not anticipate the position of the first letters; hence, if the letter-integration explanation is correct, the asymmetry in the priming should be attenuated. Consistent with the word-integration explanation, however, priming occurred when the target shared the beginning letters with the prime in both languages. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct Assessments of the Processing Time Hypothesis for the Missing-Letter Effect.

When participants search for a target letter while reading, they make more omissions if the target letter is embedded in frequently used words or in the most frequent meaning of a polysemic word. According to the processing time hypothesis, this occurs because familiar words and meanings are identified faster, leaving less time for letter identification. Contrary to the predictions of the processing time hypothesis, with a rapid serial visual presentation procedure, participants were slower at detecting target letters for more frequent words or the most frequent meaning of a word (Experiments 1 and 2) or at detecting the word itself instead of a target letter (Experiment 3). In Experiments 4 and 5, participants self-initiated the presentation of each word, and the same pattern of results was observed as in Experiments 1 and 3. Positive correlations were also found between omission rate and response latencies. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reading ability and single-letter orthographic redundancy.

Two experiments investigated the role of one form of intraword orthographic redundancy: the characteristic asymmetric spatial distributions of letters of the alphabet across serial positions within words. In Exp I, 81 college students demonstrated recognition knowledge of these distributions when given only the letter name, word length, and serial position information with no other context. Ss were correct more often for those letters which are least variable across serial positions. In Exp II, 28 5th graders who were skilled readers demonstrated a sensitivity to letter positional distributions similar to that of the adults; 20 poor readers did not. However, performance was equivalent for both good and poor readers on a subset of letters relatively unpredictable with respect to serial position. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Word learning in beginning readers and prereaders: Effects of form class and defining contexts.

Describes 3 experiments using a total of 141 kindergartners and 1st graders as Ss. In a paired associate task, readers and prereaders were taught 5 words as oral responses, each word paired with a distinctive nonsense figure. Context-dependent words (i.e., past tense verbs, prepositions, functors, which require verbal contexts to be meaningful) took longer to learn than context-free words (nouns, adjectives). Providing a sentence context, however, did not make it easier to learn either word class. In contrast to readers, prereaders had substantial difficulty learning the words, particularly context-dependent words. This is attributed to the prereaders' failure to recognize these words as units in their language. In view of the difficulty remembering the words, the results raise doubts about the effectiveness of teaching beginning readers sight vocabulary words printed on flash cards. (23 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Letter legibility and visual word recognition

Word recognition performance varies systematically as a function of where the eyes fixate in the word. Performance is maximal with the eye slightly left of the center of the word and decreases drastically to both sides of this optimal viewing position. While manipulations of lexical factors have only marginal effects on this phenomenon, previous studies have pointed to a relation between the viewing position effect (VPE) and letter legibility: When letter legibility drops, the VPE becomes more exaggerated. To further investigate this phenomenon, we improved letter legibility by magnifying letter size in a way that was proportional to the distance from fixation (e.g., TABLE). Contrary to what would be expected if the VPE were due to limits of acuity, improving the legibility of letters has only a restricted influence on performance. In particular, for long words, a strong VPE remains even when letter legibility is equalized across eccentricities. The failure to neutralize the VPE is interpreted in terms of perceptual learning: Since normally, because of acuity limitations, the only information available in parafoveal vision concerns low-resolution features of letters; even when magnification provides better information, readers are unable to make use of it.     

Parafoveal and foveal processing of abbreviations during eye fixations in reading: Making a case for case.

The processing of abbreviations in reading was examined with an eye movement experiment. Abbreviations were of 2 distinct types: acronyms (abbreviations that can be read with the normal grapheme-phoneme correspondence [GPC] rules, such as NASA) and initialisms (abbreviations in which the GPCs are letter names, such as NCAA). Parafoveal and foveal processing of these abbreviations was assessed with the use of the boundary change paradigm (K. Rayner, 1975). Using this paradigm, previews of the abbreviations were either identical to the abbreviation (NASA or NCAA), orthographically legal (NUSO or NOBA), or illegal (NRSB or NRBA). The abbreviations were presented as capital letter strings within normal, predominantly lowercase sentences and also sentences in all capital letters such that the abbreviations would not be visually distinct. The results indicate that acronyms and initialisms undergo different processing during reading and that readers can modulate their processing based on low-level visual cues (distinct capitalization) in parafoveal vision. In particular, readers may be biased to process capitalized letter strings as initialisms in parafoveal vision when the rest of the sentence is normal, lowercase letters. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

On the functional relationship between word identification and letter probability.

Investigated whether words made up of probable letters and probable letter combinations are more accurately recognized than words made up of improbable letters and improbable letter combinations. The experimental method corrected shortcomings in previous research which has shown accuracy of word recognition to be affected only by word probability and not by letter probability. The shortcomings were the confounding of different letter probability dimensions within one another. In the present investigation with 40 19-43 yr old adults, 100 words were assessed with respect to the probabilities of their letters and, independently, the conditional probabilities of their letters. Subsequent tests of recognition accuracy in a brief presentation showed accuracy to be greatest for words made up of letters having either high simple probabilities or high conditional probabilities. It is concluded that word recognition is an active, perhaps serial, process which makes liberal use of individual letter statistics to facilitate accurate recognition. (French summary) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Children's reading processes revealed by pronunciation latencies and errors.

Conducted an experiment with 30 8-yr-olds to discover under what circumstances, if any, children use whole words, syllables, letter clusters, or letters as units during reading. Using I. Firth's (1972) list of familiar words and syllables, 3 classes of stimulus words were constructed: familiar words, pseudowords consisting of familiar syllables, and pseudowords consisting of unfamiliar syllables. The number of syllables, letter clusters, and letters in these words was systematically varied. Familiar words were found to be easier to process than pseudowords; pseudowords consisting of familiar syllables were easier to process than those consisting of unfamiliar syllables. Results indicate that syllables and letter clusters are probably not processed as units for any type of word, but there was slight evidence that letters may function as units, particularly for pseudowords. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Syllable and letter knowledge in early Korean Hangul reading.

This study examined the development of Korean consonant–vowel (CV) syllable identification, consonant and vowel letter knowledge, and their relationships to phonological awareness and the reading of regular Hangul words among Korean kindergartners as a 6-month longitudinal study. Results showed that Korean children identified CV syllables better than consonant and vowel letters. In regression analyses, CV syllable identification at Time 1 strongly contributed to Hangul word recognition concurrently over and above letter knowledge, as well as longitudinally after controlling for letter knowledge and reading at Time 1. However, letter knowledge did not predict Hangul reading once CV syllable identification was controlled. In addition, CV syllable knowledge facilitated subsequent letter knowledge and phoneme onset and coda awareness. The results, in general, shed light on the salient roles of syllables in the early literacy development of Korean. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of meaning on letter detection.

Six experiments examined whether familiarity of word meaning affected letter detection in common function words. Fewer detection errors occurred for the when it had an unusual meaning, was contrastive, or had an ambiguous referent. Fewer errors occurred for less common meanings of in and it even when it took on less semantic content and was a function word. These experiments suggest that the length of time spent processing a given word is a major determinant of letter detection errors on that word, that common meanings of words are more quickly accessed than uncommon meanings, that word meaning plays an important role in letter detection, and that visual processing of letters occurs during a late stage of semantic accessing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)