Perceived control in continuous loud noise

The effects of two types of perceived control were assessed for performance during and following exposure to continuous loud noise at 90 dBC. Subjects performed a tracking task during exposure and the Stroop test in the period following exposure. Control could be effected either (1) by attenuating the intensity of the noise or (2) by reducing the difficulty of the tracking task. In both cases subjects were encouraged not to exercise control. Performance in treatments involving loud (90 dBC) and soft (55 dBC) noise served as baseline conditions. Perceived control of task difficulty accentuated the tendency for root-mean-square error to rise during the tracking task. There were no significant effects of noise intensi ty on tracking performance. Loud noise reduced the incidence of errors in the Stroop test but perceived control failed to influence this effect. The results are discussed in terms of the generality of perceived control phenomena.     

Controlled attending as a function of melodic and temporal context

Melodic and rhythmic context were systematically varied in a pattern recognition task involving pairs (standard-comparison) of nine-tone auditory sequences. The experiment was designed to test the hypothesis that rhythmic context can direct attention toward or away from tones which instantiate higher order melodic rules. Three levels of melodic structure (one, two, no higher order rules) were crossed with four levels of rhythm [isochronous, dactyl (A U U), anapest (U U A), irregular]. Rhythms were designed to shift accent locations on three centrally embedded tones. Listeners were more accurate in detecting violations of higher order melodic rules when the rhythmic context induced accents on tones which instantiated these rules. Effects are discussed in terms of attentional rhythmicity.     

Negative recency and measurement of primary memory.

The technique of Waugh & Norman (1965) is widely used in measuring the capacity of primary memory. Watkins (1974) has proposed a modification of the technique which takes into account registration failure. A further modification is proposed which takes into account findings of negative recency in delayed recall.     

Time-series analysis in operant research

A time-series method is presented, nontechnically, for analysis of data generated in individual-subject operant studies, and is recommended as a supplement to visual analysis of behavior change in reversal or multiple-baseline experiments. The method can be used to identify three kinds of statistically significant behavior change: (a) changes in score levels from one experimental phase to another, (b) reliable upward or downward trends in scores, and (c) changes in trends between phases. The detection of, and reliance on, serial dependency (autocorrelation among temporally adjacent scores) in individual-subject behavioral scores is emphasized. Examples of published data from the operant literature are used to illustrate the time-series method.     

A controlled trial of the treatment of nocturnal enuresis in residential homes for children

The present study was undertaken to evaluate the practicability and efficacy of treating enuretic children in residential Children's Homes by means of the enuresis alarm. A control group design was employed with 19 and 20 subjects in the treatment and control groups respectively. Eighteen of the nineteen treatment group children achieved initial arrest of enuresis in a mean of 11.9 weeks of treatment (range 5–28 weeks). Over the initial 12-week period, the treatment group showed a statistically significant reduction in mean wetting frequency, both over time and in comparison with the control group. After a follow-up period of at least 20 months. 17 of the 19 children were known to be dry. The results of an independent evaluation are reported, and it is concluded that alarm treatment is as effective and practicable in Children's Homes as it is in family situations.     

Haloperidol and the treatment of stuttering

Reports of the use of haloperidol in the treatment of stuttering show that it does reduce the severity of the disorder in some subjects. Two trials of the drug in adult stutterers confirmed this effect in 17% of the 52 subjects tested. Side effects —principally drowsiness—caused many subjects to discontinue taking the drug and only one subject voluntarily continued on haloperidol after the trial concluded. It is concluded that haloperidol, a potentially simple remedy, is not the treatment of choice in adults who stutter.     

Evidence for an outflow theory of skill.

We argue that central monitoring of efferent signals (CME) is a necessary and perhaps sufficient condition for the most accurate reproduction of a linear movement. In a movement duplication task where the subject sets or is given a criterion movement which he then attempts to reproduce, we argue that voluntary criterion and reproduction movements may be based upon some ‘pre-set’ instruction whereas passive movement duplication must be based upon proprioceptive information. We show that subjects can perform a visual signal detection task during the voluntary criterion movement which does not affect accuracy of reproduction. The same task carried out during the passive criterion movement does affect reproduction. These findings suggest that pick-up of proprioceptive information is not involved in voluntary movement.     

On the limits of Kagan’s impulsive reflective distinction

A logical analysis is made of the Matching Familiar Figures (MFF) Test on the basis of which children have been classified as "impulsive" or "reflective." The reflective strategy is implicitly preferred to the impulsive because the reflective child makes fewer errors though generally taking longer to make his first response. We show that the test allows the choice of a number of "game plans" and speed-accuracy tradeoffs which in practice may not be very different. Error rates may not indicate perceptual sensitivity, in any case, since sensitivity and response factors may be confounded in the error rate. Using a visual running-memory-span task to avoid the inherent difficulties of the MFF test, we found that children previously classified on the basis of that test as impulsive or reflective did not differ in recognition accuracy but did differ in response bias and response latency. Accuracy and bias are estimated by way of Luce's choice theory (Luce, 1963), and the results are discussed in those terms.