Perceptual grouping affects pitch judgments across time and frequency

Pitch, the perceptual correlate of fundamental frequency (F0), plays an important role in speech, music, and animal vocalizations. Changes in F0 over time help define musical melodies and speech prosody, while comparisons of simultaneous F0 are important for musical harmony, and for segregating competing sound sources. This study compared listeners' ability to detect differences in F0 between pairs of sequential or simultaneous tones that were filtered into separate, nonoverlapping spectral regions. The timbre differences induced by filtering led to poor F0 discrimination in the sequential, but not the simultaneous, conditions. Temporal overlap of the two tones was not sufficient to produce good performance; instead performance appeared to depend on the two tones being integrated into the same perceptual object. The results confirm the difficulty of comparing the pitches of sequential sounds with different timbres and suggest that, for simultaneous sounds, pitch differences may be detected through a decrease in perceptual fusion rather than an explicit coding and comparison of the underlying F0s.     

Consistency of adherence across regimen demands

The extent to which adherence to one demand of the diabetic treatment regimen is related to adherence to other regimen demands was explored in a sample of 227 diabetic patients. Adherence to weight control, urine/blood testing, medication taking, symptom reporting, and safety demands was assessed using a variety of methods: (a) patients' report in relation to physician's criteria, (b) patients' report in relation to their own understanding of those criteria, (c) significant others' reports, (d) nurses' ratings, and (e) physicians' ratings. Based on attribution theory, it was proposed that informed others would view patients as more consistent than patients themselves did. Separate intercorrelation matrices were created for each method. The correlations, however, were uniformly low (most rs less than .25) and mean correlations did not differ significantly between matrices. The relative independence of adherence to different demands of the diabetic regimen has important implications for the conceptualization and measurement of treatment adherence.     

Validation of the five-factor model of personality across instruments and observers

Two data sources--self-reports and peer ratings--and two instruments--adjective factors and questionnaire scales--were used to assess the five-factor model of personality. As in a previous study of self-reports (McCrae & Costa, 1985b), adjective factors of neuroticism, extraversion, openness to experience, agreeableness-antagonism, and conscientiousness-undirectedness were identified in an analysis of 738 peer ratings of 275 adult subjects. Intraclass correlations among raters, ranging from .30 to .65, and correlations between mean peer ratings and self-reports, from .25 to .62, showed substantial cross-observer agreement on all five adjective factors. Similar results were seen in analyses of scales from the NEO Personality Inventory. Items from the adjective factors were used as guides in a discussion of the nature of the five factors. These data reinforce recent appeals for the adoption of the five-factor model in personality research and assessment.     

Individual differences in children's private speech: Consistency across tasks, timepoints, and contexts

Children often talk themselves through their activities. They produce private speech (PS), which is internalized to form inner speech (silent verbal thought). Twenty-five 8-10-year-olds completed four tasks in a laboratory context (Tower of London, digit span, and two measures of spatial IQ). PS production was recorded. Eleven months later, the same participants completed the Tower of London and academic numeracy tasks, again in a laboratory context, as well as numeracy tasks in a classroom context. Rates of PS production and its level of internalization showed large positive correlations across time, tasks, and contexts. The results are interpreted in terms of the psychometric properties of PS production and are taken as evidence for the development of a domain-general system for verbal self-regulation in childhood.     

Consistency of adults’ earliest memories across two years

ABSTRACT

The consistency of earliest memories in content, dating, and memory qualities was investigated. A total of 84 (27 males; M_age?=?24.93, SD?=?1.36) adults reported earliest memories, estimated ages, and rated their recollections on memory qualities with a two-year time lag. At Time 2, their original reports at Time 1 were presented and they were asked to report whether the earliest memories they recalled at Time 2 were the same. Fifty-six per cent of the participants reported the same earliest memories and those remembering the same events had earlier memories than those remembering different ones. Although no significant differences were observed in estimated ages on the basis of mean ages, a predating bias of later memories and a tendency to postdate earlier memories were observed on the basis of a 48-month cut-off point. Thus, how the data is analysed is critical in detecting dating biases or errors affecting conclusions and interpretations about the dating consistency of earliest memories. Finally, memory qualities of earliest memories displayed a high level of consistency with a two-year time lag regardless of remembering the same versus different event.     

Age-dependent consequences of seizures: relationship to seizure frequency, brain damage, and circuitry reorganization

Seizures in the developing brain pose a challenge to the clinician. In addition to the acute effects of the seizure, there are questions regarding the impact of severe or recurrent seizures on the developing brain. Whether provoked seizures cause brain damage, synaptic reorganization, or epilepsy is of paramount importance to patients and physicians. Such questions are especially relevant in the decision to treat or not treat febrile seizures, a common occurrence in childhood. These clinical questions have been addressed using clinical and animal research. The largest prospective studies do not find a causal connection between febrile seizures and later temporal lobe epilepsy. The immature brain seems relatively resistant to the seizure-induced neuronal loss and new synapse formation seen in the mature brain. Laboratory investigations using a developmental rat model corresponding to human febrile seizures find that even though structural changes do not result from hyperthermic seizures, synaptic function may be chronically altered. The increased understanding of the cellular and synaptic mechanisms of seizure-induced damage may benefit patients and clinicians in the form of improved therapies to attenuate damage and changes induced by seizures and to prevent the development of epilepsy.     

Comparing and unifying slope estimates across psychometric function models

The psychometric function relating stimulus intensity to response probability generally presents itself as a monotonically increasing sigmoid profile. Two summary parameters of the function are particularly important as measures of perceptual performance: the threshold parameter, which defines the location of the function over the stimulus axis (abscissa), and the slope parameter, which defines the (local) rate at which response probability increases with increasing stimulus intensity. In practice, the psychometric function may be modeled by a variety of mathematical structures, and the resulting algebraic expression describing the slope parameter may vary considerably between different functions fitted to the same experimental data. This variation often restricts comparisons between studies that select different functions and compromises the general interpretation of slope values. This article reviews the general characteristics of psychometric function models, discusses three strategies for resolving the issue of slope value differences, and presents mathematical expressions for implementing each strategy.     

Programming generalization and maintenance of treatment effects across time and across settings

Effects of three experimental and one control strategy were investigated in facilitating generalization and maintenance of treatment effects after two months in a token-economy classroom. At the conclusion of treatment, subjects were randomly assigned to one of three maintenance strategies or a control group and returned to their regular classrooms. The maintenance strategies were peer reprogramming, equating stimulus conditions between the experimental and regular classrooms, and teacher training in behavior management techniques. The maintenance strategies were implemented in the regular classroom for a two-month period and then terminated. Results indicated a powerful treatment effect produced by the token economy. Behavior maintenance effects following treatment were also obtained. The mean per cent appropriate behavior for the peer reprogramming and equating stimulus conditions strategies was significantly greater than the mean for the control subjects. The teacher training and control group means were not significantly different.     

On the relation between frequency estimates and recognition memory

The paper concerns the relation between frequency estimates and recognition decisions. Theories postulating that these two measures reflect independent retrieval processes and theories that postulate that frequency estimation and recognition are mutually dependent processes are discussed. Empirical results apparently supporting both positions are also reviewed. Results of experiments in which instructions and test methods are varied factorially and results of conditional and correlational analyses establishing a dependency between frequency estimates and recognition decisions are taken as evidence supporting the dependent process view. However, the results do not permit discrimination within this class of theories.     

Driving speed changes and subjective estimates of time savings,accident risks and braking

Participants made decisions between two road improvements to increase mean speed. Time saved when speed increased from a higher driving speed was overestimated in relation to time saved from increases from lower speeds. In Study 2, participants matched pairs of speed increases so that they would give the same time saving and repeated the bias. The increase in risk of an accident with person injury was underestimated and the increase in risk of a fatal accident grossly underestimated when speed increased. The increase of stopping distance when speed increased was systematically underestimated. In Study 3, the tasks and results of Study 2 were repeated with engineering students. When forming opinions about speed limits and traffic planning, drivers, the public, politicians and others who do not collect the proper facts are liable to the same biases as those demonstrated in the present study. Copyright © 2008 John Wiley & Sons, Ltd.     

A validation of the five-factor model of personality in academically talented youth across observers and instruments

Four instruments—the NEO-Five-Factor Inventory (NEO-FFI), the Adjective Check List (ACL), the Myers–Briggs Type Indicator (MBTI) and the California Child Q-Set (CCQ)—and two data sources—self reports and parental ratings—were used to assess personality dimensions according to the five-factor model of personality in 870 academically talented youth (mean age = 13.77) from the U.S.A. Data from the parents of 565 of these children were also analysed. The factor structure of the self and parent reports, the convergence between the two sources of reports and the correlations of the adjectives in the ACL with the scores on the NEO-FFI were all consistent with previous results obtained from adults. The findings largely support the notion that the five-factor model as derived from data from adults is applicable to academically talented youth.     

The internal clock: evidence for a temporal oscillator underlying time perception with some estimates of its characteristic frequency

Evidence for the proposition that human time perception is determined by an internal clock is largely indirect. It would strengthen the case for this hypothesis if a model for the internal clock were available from which predictions could be derived and tested, and if the basic parameter of such a model, the frequency at which the clock runs, could be estimated. A model for an internal temporal pacemaker is briefly described and its properties are explored by computer simulation. Results are obtained that provide a basis for predicting that, under appropriate conditions, interference between an imposed rhythm and the frequency of a temporal oscillator may cause perturbations in temporal judgment which are related to the characteristic frequency of that oscillator. Experimental data are reported which appear to demonstrate such an interference pattern. These results allow some estimates of the characteristic frequency of the temporal oscillator to be obtained.     

A comparison of frequency, interval, and time-sampling methods of data collection

Data representing high, medium, and low response rates in constant and nonconstant patterns were generated by electromechanical equipment to determine whether the same data collected by time-sampling, interval recording, and frequency recording would be represented similarly by each method. Results indicated: (1) that time-sampling provided an extremely inaccurate estimate of responding, and (2) that interval recording accurately represented responding of low and medium rates, but grossly underestimated high-rate responding.     

Conceptions of the self and others across time

People are full of plans, goals, hopes, and fears-future-oriented thoughts that constitute a significant part of the self-concept. But are representations of others similarly future oriented? Studies 1a and 1b demonstrate that the future is seen as a larger component of the self than of another person. Study 2 found that because self-identity is tied to an unrealized future, the self is thought to be less knowable than others in the present. Study 3 indicates that people believe that others need to know who they are striving to be in order to be understood-more so than they believe they need to know others' strivings to understand them. Studies 4a and 4b tested an important implication of these findings, that because so much of who they are is tied to the future, people believe they are further from their ideal selves than others are. Implications for judgment and decision making are discussed.     

Risk factors for adolescent marijuana use across cultures and across time.

An integrated analysis of the data from 3 different studies was conducted to examine the early psychosocial predictors of later marijuana use among adolescents. Longitudinal analysis of interview data was performed. The data used in the analysis were derived from (a) a sample of 739 predominantly White adolescents representative of the northeastern United States, (b) a sample of 1,190 minority adolescents from the East Harlem section of New York City, and (c) a sample of 1,374 Colombian adolescents from two cities in Colombia, South America. In 2 of the samples, participants were interviewed in their homes, and in the 3rd study, participants were assessed in school. The predictors included a number of variables from (a) the personality domain, reflecting the adolescents' conventionality and intrapsychic functioning; (b) the family domain, representing the parent-child mutual attachment relationship and parental substance use; (c) the peer domain, reflecting the peer group's delinquency and substance use; and (d) the adolescents' own use of legal drugs. The dependent variable was adolescent marijuana use. The results of the analysis demonstrated remarkable consistency in the risk and protective factors for later marijuana use across the 3 samples, attesting to the robust nature of these predictors and their generalizability across gender, time, location, and ethnic/cultural background. These findings have important implications for designing intervention programs. Programs aimed at preventing adolescent marijuana use can be designed to incorporate universal features and still incorporate specific components that address the unique needs of adolescents from different groups.     

Virtue theory,ideal observers,and the supererogatory

I argue that recent virtue theories (including those of Hursthouse, Slote, and Swanton) face important initial difficulties in accommodating the supererogatory. In particular, I consider several potential characterizations of the supererogatory modeled upon these familiar virtue theories (and their accounts of rightness) and argue that they fail to provide an adequate account of supererogation. In the second half of the paper I sketch an alternative virtue-based characterization of supererogation, one that is grounded in the attitudes of virtuous ideal observers, and that avoids the concerns raised in the first part of the paper.     

Consistency and inconsistency in infant emotional and social interactive behavior across contexts and caregivers

This study examined consistency in infant emotional and social interactive behavior in stressful and nonstressful situations with mothers and fathers. Infants were seen at 12 and 13 months, once with each parent. Emotion was assessed during free play and the Strange Situation. Strange Situation social interactive behaviors were also examined. Results demonstrated that (a) proximity seeking and contact maintaining are consistent cross-parent, (b) emotion is more consistent from free play to the Strange Situation with the father than with the mother, and (c) emotion is primarily consistent cross-parent within the Strange Situation, not in free play. These results suggest both infant- and relationship-based determinants of behavior within the Strange Situation. The greater cross-context consistency in infant emotion with the father is interpreted as supportive of the view that infant—father interactions reflect primarily affiliative, rather than attachment, relationships.