A quasi-experimental validation of transactional strategies instruction with low-achieving second-grade readers.

Second-grade, low-achieving students experienced a year of either transactional strategies instruction or highly regarded, more conventional second-grade reading instruction. By the end of the academic year, there was clear evidence of greater strategy awareness and strategy use, greater acquisition of information from material read in reading group, and superior performance on standardized reading tests by the transactional strategies instruction students. This is the clearest validation to date of educator-developed transactional strategies instruction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reading strategies for children and adults: A quantitative model.

Developed an additive model to account for reading times for 2 different reading tasks (reading for retention and reading for comprehension). The reading strategies of 48 college students and 64 5th graders and individual differences between fast and slow readers were examined. Ss were assumed to have processors that handle the lexical, structural, and meaning information in sentences. The various task, age, and reading speed groups were hypothesized to use the 3 processors for differing amounts of time. The model was supported by word-by-word reading times for 80 sentences and by 9 empirical indices of lexical, structural, and meaning attributes of text. Results show that for skilled adult Ss, relatively more time was spent processing structure in the retention task, and meaning in the comprehension task. Fifth graders had not fully mastered the connection between task demands and linguistic processors shown by adults, and thus used mixtures of the adult strategies. (101 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Play fighting between kindling-prone (fast) and kindling-resistant (slow) rats.

Differences in the play behavior of 2 strains of rats suggest that different components of play fighting can be modified independently. The development of play fighting in cross-strain pairs of familiar and unfamiliar rats was examined to determine whether interacting with a noncongruent pairmate would alter the pattern of play typical for each strain. In both strains, changes in play fighting were observed throughout development, but partner identity appeared to influence play fighting in different ways depending on age. These data suggest that some components of play may be more impervious to changes in social environment than other components. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adaptive flexibility and maladaptive routines in selecting fast and frugal decision strategies.

Decision routines unburden the cognitive capacity of the decision maker. In changing environments, however, routines may become maladaptive. In 2 experiments with a hypothetical stock market game (n = 241), the authors tested whether decision routines tend to persist at the level of decision strategies rather than at the level of options in strategy selection. The payoff structure of the task was changed after 80 decision trials, rendering a new strategy optimal with respect to expected payoff. Whereas most participants detected the appropriate strategy at the beginning of the task, they tended to retain it even when it was no longer optimal. A hint about a possible change had only a small influence on this maladaptive routine; a monetary incentive had none. Switching to a similar but not identical task relaxed the routine, but not much. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Readability of readers.

The Flesch count readability formula was applied to general readers in psychology intended to be used in combination with regular psychology tests. Results indicate that "… the books are of about the same degree of difficulty, all being difficult according to Flesch's standards… . Some of the most readable work was done by such writers as Kohler, Freud, Munn, Murphy, James McKeen Cattell and Lashley." Among the more difficult to read are Lewin, Pavlov, Carmichael, and Cruze. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The fast and the slow of skilled bimanual rhythm production: Parallel versus integrated timing.

Professional pianists performed 2 bimanual rhythms at a wide range of different tempos. The polyrhythmic task required the combination of 2 isochronous sequences (3 against 4) between the hands; in the syncopated rhythm task successive keystrokes formed intervals of identical (isochronous) durations. At slower tempos, pianists relied on integrated timing control merging successive intervals between the hands into a common reference frame. A timer–motor model is proposed based on the concepts of rate fluctuation and the distinction between target specification and timekeeper execution processes as a quantitative account of performance at slow tempos. At rapid rates expert pianists used hand-independent, parallel timing control. In alternative to a model based on a single central clock, findings support a model of flexible control structures with multiple timekeepers that can work in parallel to accommodate specific task constraints. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

There are at least two kinds of poor readers: Whole-word poor readers and recoding poor readers.

Current theories of reading are used to predict the existence of at least 2 subtypes of poor readers, and results from 3 experiments with 27 good and 13 poor readers (Primary Mental Abilities Test) from the 3rd grade support this claim. Recoding poor readers relied heavily on a sound-based code and on submorphemic units while reading single words, whereas whole-word poor readers did not. It is argued that only an individual-differences framework coupled with current theory is rich enough to characterize reading disorders adequately. (French abstract) (29 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Voltage dependencies of the fast and slow gating modes of RIIA sodium channels

Rat brain IIA sodium channel alpha-subunits were expressed in Xenopus oocytes, and the sodium currents were measured by intracellular voltage clamping with large agarose-tipped electrodes and by excised membrane patch-clamp recording to separate and characterize the properties of the fast and slow channel gating modes. The currents showed biexponential inactivation properties with fast and slow phases that could be isolated as distinct gating modes through differences in their inactivation properties. At holding potentials more negative than -55 mV, fast mode currents inactivated within a few milliseconds of depolarization, and could be distinguished by their rapid recovery from inactivation. Single sodium channels in the fast mode opened early after depolarization and rarely showed re-openings. At holding potentials positive to -55 mV, fast mode currents were inactivated, revealing slow mode currents which had slower activation and inactivation kinetics and showed sustained single channel activity during depolarizing pulses. The steady-state voltage dependencies of fast and slow mode activation were very similar. In contrast, slow mode inactivation occurred at potentials 27 mV more positive than fast mode inactivation. The slow mode appears to be due to destabilization of a voltage-insensitive conformation of the channel. The fast gating process dominated at high current levels, perhaps due to alpha-subunit interactions.     

The speed of feature-based attention: Attentional advantage is slow, but selection is fast.

When paying attention to a feature (e.g., red), no attentional advantage is gained in perceiving items with this feature in very brief displays. Therefore, feature-based attention seems to be slow. In previous feature-based attention studies, attention has often been measured as the difference in performance in a secondary task. In our recent work on Boolean map theory (Huang & Pashler, 2007), we distinguished between 2 concepts that are often conflated with the term attention, namely the selection of information from stimulus and the following processing optimization (i.e., attentional advantage) of the selected stimulus. Attention, as examined in previous feature-based attention studies, only fits the definition of processing optimization, but does not fit the definition of selection of information. Therefore, it is open to question whether feature-based attention, when defined as selection, is fast or slow. In this study, I systematically measured the speed of feature-based attention in relation to both definitions. Attention was found to be slow (~100 ms) in terms of processing optimization (i.e., attentional advantage) but fast in terms of the selection of information (     

Changes of acid phosphatase activity of fast and slow rat muscles during ontogenetic development

Total IgG, IgG subclass and IgE antibodies specific for grass pollen allergens were measured by the red cell linked antigen-antiglobulin reaction (RCLAAR) in a serum samples from nineteen patients who had undergone a course of hyposensitization. Increases in both specific IgG and IgE antibodies were seen after treatment in most patients. In the IgG subclasses the predominant response was for IgG1 and IgG4 antibodies. Attempts were made to correlate the antibody responses with the clinical response and the results are discussed with reference to the possible mechanisms of hyposensitization.     

Detection of linguistic ambiguity by reflective, impulsive, fast/accurate, and slow/inaccurate children.

Investigated the relation of conceptual tempo to children's detection of linguistic ambiguity. After completing the Matching Familiar Figures Test, 96 4th and 7th graders were classified as reflective, impulsive, fast/accurate, and slow/accurate and were asked to paraphrase the meaning of ambiguous sentences and then to indicate their meaning through a selection of pictures. Results indicate that reflective children were more successful than impulsive and slow/inaccurate children (a) in spontaneous paraphrasing of the multiple meanings of sentences and (b) in detecting the various ambiguities on the picture measure. In contast, on the paraphrase measure, prompting by the examiner to consider alternative meanings for the sentences eliminated differences among conceptual tempo groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Word consciousness in readers and prereaders.

Examined the extent of readers' and prereaders' conscious awareness of the constituents of speech. 35 white middle-class preschool prereaders, kindergarten prereaders, and 1st-grade readers were given 4 tasks. Results indicate that readers outperformed prereaders and that the 2 groups of prereaders did not differ. Readers were better able to embed words in verbal contexts, to segment sentences into words and syllables, to identify the word distinguishing 2 otherwise identical sentences, and to identify words containing particular final syllables. Prereaders sometimes confused syllables and words, and they encountered more difficulty with function words than with contentives. Superior lexical awareness among readers was attributed to their experience with the printed correlates of spoken language. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Postnatal development of nitric oxide synthase activity in fast and slow muscles of the rat

Nitric oxide synthase (NOS) activity was measured in extensor digitorum longus (EDL) and soleus muscles during postnatal development in the rat. At 1 and 2 weeks of age, similar low levels were found in both muscles. After 2 weeks, activity increased significantly only in EDL. Adult NOS activity was significantly higher in EDL than soleus. Thus, the preferential expression of NOS in fast muscle only occurs once the adult pattern of motor activity is established.     

EMG of slow and fast ankle extensors of cat during posture, locomotion, and jumping

Methods are described for the preparation in vivo of 35S-methionine-labelled influenza viruses, the purifiction of the nucleoprotein (NP) and matrix (M) proteins and the separation of peptides obtained by protease digestion by two-dimensional thin-layer chromatography. The maps of the M proteins of A/Okuda/57(H2N2) and A/Finland/4/74(H3N2) were very similar overall but differed in three peptides. Hence they could be clearly distinguished. Maps of the NP proteins of the same strains showed a greater number of differences. A recombinant strain having the haemagglutinin and neuraminidase of the A/Finland/4/74 parent and the virulence of the A/Okuda/57 parent was shown to have the M and P proteins of A/okuda/57.     

Evidence for distinct fast and slow myogenic cell lineages in human foetal skeletal muscle

p21waf1 has been shown to mediate the p53-dependent growth arrest induced by DNA-damaging agents. Several functions have been ascribed to p21waf1 that could be involved in this growth arrest. For one, p21waf1 is an efficient inhibitor of cyclin-dependent kinases (CDKs). Also, p21waf1 can interact with proliferating cell nuclear antigen (PCNA), and as such inhibit in vitro DNA-replication. Finally, p21waf1 has been reported to inhibit stress-activated protein kinases (SAPKs). In order to study these multiple functions of p21waf1 we have established U2OS-derived cell lines, in which the expression of p21waf1 can be regulated by the concentration of tetracycline in the culture medium. We observed a virtually complete, but reversible inhibition of cell growth upon induction of p21waf1-expression. Both [3H]thymidine-incorporation and CDK2-activity were strongly inhibited by p21waf1. Upon induction of p21waf1 cells accumulated with a 2N or 4N DNA content suggesting events in G1 and G2 can be inhibited by p21waf1. Indeed, kinase activity associated with cyclin B was reduced dramatically upon induction of p21waf1, although cyclin B continues to be expressed. In contrast, p21waf1 does not seem to inhibit the function of PCNA in ongoing DNA replication, since cells expressing high levels of p21waf1 apparently progressed normally through S-phase. Also, the activity of SAPKs was not substantially affected by the high levels of p21waf1. We conclude that, at least in these U2OS-derived cells, p21waf1 functions as an inhibitor of CDK-activity in G1 and G2, but not as an inhibitor of PCNA or SAPKs.     

Comprehension calibration and recall prediction accuracy of texts: Reading skill, reading strategies, and effort.

High school students at 3 levels of verbal skill rated their own recall (prediction accuracy) and comprehension (calibration accuracy) of 3 expository texts accompanied by 3 different sets of instructions. All sets of instructions emphasized reading for understanding, and two of them also involved key words (given or personally selected), which were to be used during study. Students assessed which instructions they preferred and estimated their general verbal and memory skills. Three major results were obtained (a) Students seemed to assess their general verbal and memory skills quite well. (b) Acceptable levels of comprehension calibration and recall prediction accuracy were found. Verbal-skill differences were found for recall prediction accuracy but not for comprehension calibration accuracy. (c) students had study preferences—the most preferred way to study increased performance but reduced prediction accuracy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Pattern-analyzing disability in poor readers.

Conducted a study of 15 good and 22 poor readers (as measured by the Wide Range Achievement Test and the vocabulary portion of the WISC), to assess Ss' encoding of semantic and graphemic features of sentences. Ss were administered a test of recognition memory for sentences. The test permitted separate analyses to be made of the graphemic pattern-analyzing skills required in reading sentences and of a more interpretive skill. Both groups of children performed about equally on tests involving language use and grammar, but the poor readers were markedly retarded in aspects of the graphemic analysis (pattern analyzing) of the texts. (PsycINFO Database Record (c) 2010 APA, all rights reserved)