Reports on a project which developed a measure of levels of difficulty of reference questions handled by the California Interlibrary Reference Referral Network, and identified indicative measures that would reliably stand for the concept of difficulty. Correlations of predictive difficulty and actual difficulty are discussed. (nine references)…

The readability, interest level, and content of 18 current college textbooks on mainstreaming were assessed. Results revealed that readability and interest level were comparable among the texts. More variation was found in the contents of the texts. A table lists 16 topics and the degree to which each is covered in the textbooks. (DB)

Analysis of the Bracken Basic Concept Scale (BBCS) indicated that all subtests except two (Quantity and Time) showed statistically significant correlations between item difficulty and frequency of concept words. Administration of the BBCS to 36 first graders revealed that most concept words showed expected item discrimination indices. (Author/JDD)

The hypothesis that a task that increases in complexity (increasing its correlation with a central measure of intelligence) does so by increasing its dimensionality by tapping individual differences or another variable was supported by findings from 46 adults aged 20-70 years performing a mental counting task. (SLD)

An associative model of serial learning is described based on the assumption that the effective stimulus for a serial-list item is generated by adaptation-level coding of the item's ordinal position. How the model can generate predictions of aspects of serial-learning data is illustrated. (SLD)

One-parameter and three-parameter item response theory (IRT) model estimates were compared with estimates obtained from two modified one-parameter models that incorporated a constant nonzero guessing parameter. Using small-sample simulation data (50, 100, and 200 simulated examinees), modified 1-parameter models were most effective in estimating…

Four studies determined when first, second, and third graders recognize that they make inferences to understand text, and the effect of this recognition on their ability to revise text and monitor its informativeness. Younger children tended to attribute inferred information to the text, while older children clearly distinguished inferred and…

Suggests a "complexity effect" for overall message-production speed (in which undergraduate students exhibited superior performance relative to older adults) and for initial message-production-skills performance and rate of skill acquisition, with these differences not pronounced under complex-task conditions. Finds that older adults' learning…

Research was conducted to teach two adults with schizophrenia and mental retardation to respond to recorded audio prompts when completing routine prevocational tasks. Subsequent improvements in the individuals' task completion performance suggest that audio prompts may serve as an efficient alternative to instructor assistance. (Author/GCP)

Attempts to reinterpret the threshold hypothesis, which states that low second language (L2) proficiency blocks the transfer of first language (L1) reading strategies to the reading of L2 texts. Results indicate that it is not only low foreign language proficiency but also text difficulty in terms of register complexity that negatively affect the…

This study tested the effect of embedded clauses on recall for 48 English-speaking high school students reading Spanish historical texts. It found that the complexity of sentence structure seemed to cancel the advantage of previous exposure to the content domain. Contains 39 references. (MDM)

Discussion of the use of Latent Semantic Indexing to determine relevancy in information retrieval focuses on statistical regression and Bayesian methods. Topics include keyword searching; a multiple regression model; how the regression model can aid search methods; and limitations of this approach, including complexity, linearity, and…

A study of 300 children in kindergarten, grade 2, and grade 6 found that background music improved visual discrimination task performance at the youngest and middle ages and had no effect on the oldest participants. On a square identification task, background music had no influence on easy and difficult tasks but lowered performance on…

Describes a framework for examining the effects of the cognitive complexity of tasks on language production and learner perceptions of task difficulty, and for motivating sequencing decisions in task-based syllabuses. Results of a study of the relationship between task complexity, difficulty and production show that increasing the cognitive…

This study examined effects of talker variability and lexical difficulty on spoken-word recognition among native and non-native listeners with either normal or impaired hearing. Non-native listeners required greater intensity for equal intelligibility than native listeners. Significant effects of talker variability and lexical difficulty were…