Visual encoding of patterns is subject to dual-task interference

Two stimuli were presented at varying stimulus onset asynchronies (SOAs), with each stimulus associated with a distinct task. The first stimulus was a tone at one of either two or three frequencies. In two conditions, the task associated with a tone was either a speeded two-alternative discrimination (2AD), or a speeded three-alternative discrimination (3AD) based on the pitch of the tone. In a third condition, subjects were told to ignore the tone. The second stimulus was a briefly exposed study matrix of red and black squares followed by a mask. After a fixed delay, the mask was replaced by a test matrix that was either the same or different from the study matrix. The task associated with the matrices was to indicate, with no speed pressure, whether the study matrix and the test matrix were the same or different. Results from each speeded AD condition showed that subject's accuracy in the matrix task decreased as the SOA between the tone and the study matrix decreased. This effect was larger for the 3AD tone task than with a 2AD tone task. In addition, within each speeded AD condition, longer RTs in the tone task were associated with lower accuracy in the matrix task. None of these effects was evident when the subjects were told to ignore the tone. These results suggest that encoding visual information can be subject to significant capacity limitations imposed by cross-modal multitasking.     

A Triage Tool to Assess Unmet Health Needs for Children Entering Foster Care

Children in foster care have high levels of health care needs, many of which are unmet at foster care entry. Health care coordination (HCC) is essential to ensure unmet needs are addressed rapidly. Data is lacking about how best to triage children at foster care entry so limited HCC resources can be allocated most effectively. Therefore, we aimed to: (1) utilize a Triage Tool (TT) at foster care entry to stratify children based on unmet health care needs and (2) determine if the TT is an accurate predictor of health care utilization as indicated by cost during a child’s first few weeks in care. A TT was developed and utilized during the initial foster care health exam (IFCHE) to stratify children based on unmet needs. Medicaid records were reviewed to determine health care utilization and cost during the first 60 days post-IFCHE. Most children (61.6%) had the lowest level of unmet needs (Level 3), 29.5% had a moderate level of unmet needs (Level 2), and 9.9% had the highest level of unmet needs (Level 1). Medicaid claims review revealed that triage level did not correlate to health care utilization or costs during the first 60 days post-IFCHE. Youth placed in a group home incurred significantly higher costs than those placed in foster homes. These results suggest that the TT is useful clinically but does not predict health care utilization and costs during the first weeks in care. Group home placement incurs more cost than foster home placement, independent of triage level assigned.     

The Realist Wager: Challenging Rorty on His Home Ground

Philosophia - The paper is devoted to Richard Rorty’s thought, with the aim of exploiting a certain contention of his and directing it, as it were, against Rorty himself. Here is the...     

Structure and Content in Language Production: A Theory of Frame Constraints in Phonological Speech Errors

Theories of language production propose that utterances are constructed by a mechanism that separates linguistic content from linguistic structure, Linguistic content is retrieved from the mental lexicon, and is then inserted into slots in linguistic structures or frames. Support for this kind of model at the phonological level comes from patterns of phonological speech errors. W present an alternative account of these patterns using a connectionist or parallel distributed proceesing (PDP) model that learns to produce sequences of phonological features. The model's errors exhibit some of the properties of human speech errors, specifically, properties that have been attributed to the action of phonological rules, frames, or other structural generalizations.     

Positive feedback in hierarchical connectionist models: Applications to language production

Recent connectionist models of the perception and production of words make use of positive feedback from later to earlier levels of processing. This paper focuses on production and identifies several specific effects of phoneme-tomorpheme feedback. In addition, I argue that there is support for the use of this kind of feedback in production from experimental and naturalistic studies of slips of the tongue.     

The role of semantic information in episodic retrieval

In two experiments, subjects studied lists of categorized words and then were tested for recognition of those words. Response time for a test word was speeded whenever the immediately preceding test word was from the same category. This was true even for test words (lures) from categories never studied. Thus it is argued that semantic information not present at the time of study affected retrieval. This finding is discussed with respect to the distinction between episodic and semantic memories.