Acoustical correlates of the perception of speech rate: An experimental investigation

The purpose of the study was to investigate the influence of vocal frequency and vocal intensity upon the perception of speech rate at three levels of actual speech rate. A single sample of spontaneous speech was electronically varied to produce nine stimulus segments that factorially combined three levels each of vocal frequency and intensity. The nine stimuli were recorded such that preceding each was the original segment that served as the standard with which each of the nine stimuli was to be compared. The speech rate of the set of nine stimulus pairs was then electronically altered to obtain a slow set, a moderate set, and a fast set, although the duration of every segment in the three sets was 20 seconds. The sets were rated by different groups of judges in terms of four 7-point scales that measured perceived speech rate, pitch, loudness, and perceived duration. The results indicate that the perception of speech rate is positively related to vocal frequency and intensity at each of the three actual speech rates, and suggest that these relationships are a function of the repeated experience of almost always hearing such covariation in spontaneously occurring speech.The authors are indebted to the Language Laboratory of the University of Maryland Baltimore County and are grateful for the generous amount of computer time provided by the Computer Centers of the Baltimore County and College Park campuses of the university. They are also indebted to Mr. George J. Johnson, Jr., for the design and construction of the instrument used in the study, to Drs. Edwin Susskind and Jahathan Finkelstein for their active concern about the meaning of the results, and to Dr. Klaus Scherer for his very helpful critique.     

Frequency of measurement and data utilization as factors in standardized behavioral assessment of academic skill

A study was conducted to investigate the effects on students' spelling achievement of variations in teacher assessment procedures. Teachers measured student spelling performance at a constant level of task difficulty using different measurement frequencies and different rules to interpret the data. Each teacher wrote two consecutive 3-week goals for improved spelling performance for two sets of 100 spelling words and then measured student performance either daily or weekly by dictating randomly selected words from each 100-word list. Teachers were trained to apply either a predetermined set of decision rules or their own judgment to the data to decide if the spelling program they had implemented for the student was effective. Ineffective programs were changed or modified. Results indicated that daily measurement was significantly more effective than weekly measurement in increasing spelling achievement and that, under certain conditions, decision rules were more effective than teacher judgment in determining when to make program changes or modifications.This research was conducted pursuant to Contract 300-77-0491 between the Bureau of Education for the Handicapped (now called Special Education Programs) and the University of Minnesota Institute for Research on Learning Disabilities.     

Family patterns leading to learning disability: A cognitive approach

Traditional treatment of the learning disabled child seeks to offer an individualized remediation. The authors offer as an alternative the innovative use of the family therapy modality for treatment of the learning dysfunction. This approaches the source of the learning dysfunction embedded in the faulty communication patterns within the family. The child has the opportunity to experience and more accurately comprehend the communication patterns, become more adept at interpretation of implicit meanings, and to transfer these developing skills to the formal learning situation.     

The legacy is loss

Psychotherapy with the second generation of Holocaust Survivors involves understanding that the Survivors and their offsprings are not a homogeneous group. Numerous variables, such as the age of the Survivor during the Holocaust period, the nature of the experiences, and the length of time the Survivor was imprisoned, all affect the Survivor's adaptive or maladaptive reactions. Recommendations for treating the second generation of Survivors include ascertaining the extent of loss experienced by the parents and their preoccupation with depression and mourning. It is also important to elicit whether the parents were overinvested in their children, affectively impoverished, excessively anxious and overprotective, or able to separate from the Holocaust and invest anew in their new life and family. Further suggestions for treatment are the therapist's need to be aware of countertransference reactions that may duplicate Survivor reactions to their offspring. Flexibility in treating the second generation is also indicated and may call for playing the role of auxiliary ego or, at times, even parent surrogate.     

Effects of ethanol on multiple fixed-interval fixed-ratio schedule performances: dynamic interactions at different fixed-ratio values.

Key pecking by three pigeons was maintained under a multiple fixed-interval fixed-ratio schedule of food presentation. The fixed-interval value remained at 3 minutes, while the fixed-ratio size was increased systematically in 30-response increments from 30 to either 120 (two pigeons) or 150 (one pigeon). At least two lower fixed-ratio values were also redetermined. The effects of ethanol (5 to 2.5 g/kg) were assessed at each of the different schedule parameters. Both overall and running response rates under the fixed-ratio schedule decreased with increases in the size of the fixed-ratio schedule; pause duration under the fixed-ratio schedule was directly related to increases in fixed-ratio size. Overall and running rates of responding under the fixed-interval schedule changed little with increases in the size of the fixed-ratio schedule. Despite the relative invariance of fixed-interval responding across the different fixed-ratio values, the effects of ethanol on responding under the fixed-interval schedule differed depending on the size of the fixed-ratio schedule. Greater increases occurred in both overall and in lower local rates of responding under the fixed-interval schedule when the fixed-ratio value was 120 or 150. The effects of ethanol on responding under the fixed-ratio schedule also depended on the size of the fixed ratio. Increases in responding under the fixed-ratio schedule were typically greater at the higher fixed-ratio values where response rates were lower. When the effects of ethanol were redetermined at the lower fixed-ratio parameter values, rates and patterns of responding were comparable to those obtained initially. However, the dose-effect curves for responding under both fixed-ratio and fixed-interval schedules were shifted up and to the right of those determined during the ascending series. The effects of ethanol can depend on rate or responding, behavioral history, and the context in which behavior occurs.     

Distinguishing between stochastic models of heterogeneity and contagion

Historically, the Poisson process has been the “benchmark” model for many stochastic processes. When event counts from a particular process fail to be described adequately by a Poisson distribution, a researcher may turn to generalized Poisson processes to model the empirical data more accurately. Two common generalizations are the (1) heterogeneous Poisson process, in which the process rate is a Gamma random variable, and (2) contagious Poisson process, in which the process rate depends linearly on the current state of the process. Paradoxically, both the heterogeneous and contagious processes yield the same theoretical distribution for the number of events that occur in a single interval of time. Consequently, distinguishing between these two using event counts can be difficult. This situation is discussed, first reviewing the models and distribution, then giving strategies for choosing between them using event count data, and demonstrating these techniques on episodes of hospitalization for schizophrenia.     

Non-equilibrium dynamics as an indispensable characteristic of a healthy biological system

Healthy systems in physiology and medicine are remarkable for their structural variability and dynamical complexity. The concept of fractal growth and form offers novel approaches to understanding morphogenesis and function from the level of the gene to the organism. For example, scale-invariance and long-range power-law correlations are features of non-coding DNA sequences as well as of healthy heartbeat dynamics. For cardiac regulation, perturbation of the control mechanisms by disease or aging may lead to a breakdown of these long-range correlations that normally extend over thousands of heartbeats. Quantification of such long-range scaling alterations are providing new approaches to problems ranging from molecular evolution to monitoring patients at high risk of sudden death. We briefly review recent work from our laboratory concerning the application of fractals to two apparently unrelated problems: DNA organization and beat-to-beat heart rate variability. We show how the measurement of long-range power-law correlations may provide new understanding of nucleotide organization as well as of the complex fluctuations of the heartbeat under normal and pathologic conditions.     

Persons and their Properties

According to what I call 'the asymmetry thesis', persons, though they are the direct bearers of the properties expressed by mental predicates, are not the direct bearers of properties such as those expressed by 'weighs 135 pounds' or 'has crossed legs'. A number of different views about persons entail the asymmetry thesis. I first argue that the asymmetry thesis entails an error theory about our discourse involving person-referring terms. I then argue that it is further threatened by consideration of the grounds we have for self-ascribing mental and physical predicates.