Tuomo Häikiö

Development of the letter identity span in reading: Evidence from the eye movement moving window paradigm

By means of the moving window paradigm, we examined how many letters can be identified during a single eye fixation and whether this letter identity span changes as a function of reading skill. The results revealed that 8-year-old Finnish readers identify approximately 5 characters, 10-year-old readers identify approximately 7 characters, and 12-year-old and adult readers identify approximately 9 characters to the right of fixation. Comparison with earlier studies revealed that the letter identity span is smaller than the span for identifying letter features and that it is as wide in Finnish as in English. Furthermore, the letter identity span of faster readers of each age group was larger than that of slower readers, indicating that slower readers, unlike faster readers, allocate most of their processing resources to foveally fixated words. Finally, slower second graders were largely not disrupted by smaller windows, suggesting that their word decoding skill is not yet fully automatized.

Morphological family size in a morphologically rich language: the case of Finnish compared with Dutch and Hebrew.

Finnish has a very productive morphology in which a stem can give rise to several thousand words. This study presents a visual lexical decision experiment addressing the processing consequences of the huge productivity of Finnish morphology. The authors observed that in Finnish words with larger morphological families elicited shorter response latencies. However, in contrast to Dutch and Hebrew, it is not the complete morphological family of a complex Finnish word that codetermines response latencies but only the subset of words directly derived from the complex word itself. Comparisons with parallel experiments using translation equivalents in Dutch and Hebrew showed substantial cross-language predictivity of family size between Finnish and Dutch but not between Finnish and Hebrew, reflecting the different ways in which the Hebrew and Finnish morphological systems contribute to the semantic organization of concepts in the mental lexicon.

Development of parafoveal processing within and across words in reading: Evidence from the boundary paradigm

In this study we used the boundary paradigm to examine whether readers extract more parafoveal information within than across words. More specifically, we examined whether readers extract more parafoveal information from a compound words second constituent than from the same word when it is the noun in an adjective–noun phrase (kummitustarina “ghost story” vs. lennokas tarina “vivid story”). We also examined whether the processing of compound word constituents is serial or parallel and how parafoveal word processing develops over the elementary school years. Participants were Finnish adults and 8-year-old second-, 10-year-old fourth-, and 12-year-old sixth-graders. The results showed that for all age groups more parafoveal information is extracted from the second constituent within compounds than from the noun in adjective–noun phrases. Moreover, for all age groups we found evidence for parallel processing of constituents within compounds, but only when the compounds were of high frequency. In sum, the present study shows that attentional allocation extends further to the right and is more simultaneous when words are linguistically and spatially unified, providing evidence that attention in text processing is flexible in nature.

The Development of Whole-Word Representations in Compound Word Processing: Evidence from Eye Fixation Patterns of Elementary School Children.

The role of morphology in reading development was examined by measuring participants’ eye movements while they read sentences containing either a hyphenated (e.g., ulko-ovi “front door”) or concatenated (e.g., autopeli “racing game”) compound. The participants were Finnish second, fourth, and sixth graders (aged 8, 10, and 12 years, respectively). Fast second graders and all four and sixth graders read concatenated compounds faster than hyphenated compounds. This suggests that they resort to slower morpheme-based processing for hyphenated compounds but prefer to process concatenated compounds via whole-word representations. In contrast, slow second graders’ fixation durations were shorter for hyphenated than concatenated compounds. This implies that they process all compounds via constituent morphemes and that hyphenation comes to aid in this process.

The role of syllables in word recognition among beginning Finnish readers: Evidence from eye movements during reading

The eye movements of Finnish first and second graders were monitored as they read sentences where polysyllabic words were either hyphenated at syllable boundaries, alternatingly coloured (every second syllable black, every second red) or had no explicit syllable boundary cues (e.g., ta-lo vs. talo vs. talo = “house”). The results showed that hyphenation at syllable boundaries slows down reading of first and second graders even though syllabification by hyphens is very common in Finnish reading instruction, as all first-grade textbooks include hyphens at syllable boundaries. When hyphens were positioned within a syllable (t-alo vs. ta-lo), beginning readers were even more disrupted. Alternate colouring did not affect reading speed, no matter whether colours signalled syllable structure or not. The results show that beginning Finnish readers prefer to process polysyllabic words via syllables rather than letter by letter. At the same time they imply that hyphenation encourages sequential syllable processing, which slows down the reading of children, who are already capable of parallel syllable processing or recognising words directly via the whole-word route.

Maternal pre- and postnatal anxiety symptoms and infant attention disengagement from emotional faces

BACKGROUND Biases in socio-emotional attention may be early markers of risk for self-regulation difficulties and mental illness. We examined the associations between maternal pre- and postnatal anxiety symptoms and infant attention patterns to faces, with particular focus on attentional biases to threat, across male and female infants. METHODS A general population, Caucasian sample of eight-month old infants (N = 362) were tested using eye-tracking and an attention disengagement (overlap) paradigm, with happy, fearful, neutral, and phase-scrambled faces and distractors. Maternal self-reported anxiety symptoms were assessed with the Symptom Checklist-90/anxiety subscale at five time points between gestational week 14 and 6 months postpartum. RESULTS Probability of disengagement was lowest for fearful faces in the whole sample. Maternal pre- but not postnatal anxiety symptoms associated with higher threat bias in infants, and the relation between maternal anxiety symptoms in early pregnancy and higher threat bias in infants remained significant after controlling for maternal postnatal symptoms. Maternal postnatal anxiety symptoms, in turn, associated with higher overall probability of disengagement from faces to distractors, but the effects varied by child sex. LIMITATIONS The small number of mothers suffering from very severe symptoms. No control for the comorbidity of depressive symptoms. CONCLUSIONS Maternal prenatal anxiety symptoms associate with infants heightened attention bias for threat. Maternal postnatal anxiety symptoms, in turn, associate with infants overall disengagement probability differently for boys and girls. Boys may show enhanced vigilance for distractors, except when viewing fearful faces, and girls enhanced vigilance for all socio-emotional stimuli. Long-term implications of these findings remain to be explored.

The effect of syllable-level hyphenation on reading comprehension: Evidence from eye movements.

Syllabification by hyphens (e.g., hy-phen-a-tion) is a standard procedure in early Finnish reading instruction. However, recent findings indicate that hyphenation slows down children’s reading already during the first grade (Häikiö, Hyönä, & Bertram, 2015, 2016). In the present study, it was examined whether this slowdown is indicative of deeper processing and/or more strategic reading. To this end, 2nd grade children (N = 36) read short expository and narrative stories while their eye movements were registered. The presence of syllable boundary cue (SBC) was manipulated; for half of the stories, each word was hyphenated at syllable boundaries whereas the other half included no hyphenation. After each story, story comprehension (SC) was measured by three types of oral questions, namely free recall, cued recall, and true/false questions. With regard to reading behavior, SBC interacted with independently measured reading comprehension scores for both forward and regressive fixation times during first pass sentence reading. Hyphenation slowed down reading of good comprehenders to a larger extent than weaker comprehenders in comparison to nonhyphenated condition, especially for regressive fixation times. With respect to SC, cued recall scores were lower in the hyphenated than in the nonhyphenated condition. There was no effect of SBC in free recall or true/false questions. Hyphenation seems to promote phonological encoding even when readers might want to access words via orthographic codes, which are obscured by hyphenation, especially at the whole-word level. This more piecemeal reading style then makes it harder to integrate the pieces into a bigger whole, affecting not only reading speed but also reading comprehension.