Equating the brightness of brief visual stimuli of unequal durations

The brightness of brief displays whose durations do not exceed a critical period of integration is known to covary with stimulus duration (Bloch’s law). There are cases in which the interdependence of duration and brightness introduces an unwanted confounding that must be avoided. Three methods for equating the brightness of brief stimuli displayed under computer control are described and evaluated, and an example of the outcome obtained with the most efficient procedure is reported.     

Laboratory functions for the Tecmar Lab Tender and IBM PC

A set of assembly language functions has been written to interface laboratory software for the IBM PC to the Tecmar, Inc., Lab Tender circuit board. These functions provide convenient access to the Lab Tender’s parallel ports, timers, A/D converters, and D/A converters from laboratory control programs written in the C language.     

Auditory intensity as a variable in the conditioning treatment of enuresis nocturna

Auditory intensity in the conditioning treatment of enuresis nocturna was examined in a study by Young and Morgan (1973a). In their study of three alarm intensities, no significant differences either in terms of treatment efficacy or of subsequent relapse were found. For both theoretical and practical reasons, the finding of no differences in treatment parameters as a function of varying alarm intensities is puzzling. In learning theory terms, a very intense UCS (bell or buzzer) would be expected to lead to more rapid acquisition of dryness (conditioned response) than a less intense UCS. Learning theory notwithstanding, the depth of somnolence of the enuretic child is legend. Not only are testimonials from parents regarding difficulty in arousal of their bedwetting child commonly elicited, but the literature on causes and treatment of bedwetting is replete with evidence of a deep-sleep enuresis syndrome (Bostock, 1962). It has been demonstrated by Finley (1971) and Di Perri and Meduri (1972) that the arousal threshold of enuretic children is abnormally high compared to nonenuretic children. The failure of the enuretic to awaken to the presentation of a bell (UCS) is frequently cited as responsible for unsuccessful bell-and-pad conditioning (Browning, 1967). Young and Morgan (1973b) in their study on rapidity of response to the conditioning treatment for enuresis found that one treatment problem most significantly related to slow responders was failure of the alarm stimulus to awaken the child. For those unfamiliar with the literature, the Young and Morgan (1973b) finding appears particularly surprising when one considers that they employed as their alarm UCS “...a powerful auditory stimulus...” (p. 490).Because of these important theoretical as well as practical concerns, an attempt was made to examine the effect of two auditory intensities on treatment and relapse parameters in the conditioning of enuresis nocturna.     

Conditioning treatment of enuresis using a 70% intermittent reinforcement schedule

A 70% intermittent variable ratio reinforcement schedule was administered by automated equipment to 80 enuretic children of both sexes. Dryness criterion (14 consecutive dry nights) was reached by 94% of the sample. Mean treatment duration was less than seven weeks. Approximately 80% of the sample recorded at least one multiple wetting night during the early stages of conditioning treatment. Relapse rates varied as a function of age ranging from 5.25% in 7–8 year olds to 50% in 9–10 year olds. For all ages combined, the observed relapse rate of 25% was found to be significantly lower than reported in the enuresis literature over the past 10 years.     

Operant conditioning of the EEG in two patients with epilepsy: Methodologic and clinical considerations

Methodologic and clinical considerations are discussed in sensorimotor rhythm (SMR) biofeedback research on two dissimilar but severe epileptic males. The first case, an akinetic epileptic who prior to feedback training experienced 80–100 clinical seizures every 10 hours, showed considerable seizure reduction after 6 months of SMR and epileptiform training. A number of methodologic and instrumentation advances were pioneered with the akinetic patient: (1) development of and ultra-sharp band-pass filter; (2) use of epileptiform inhibit and feed-back circuitry; (3) use of monetary rewards as additional incentive; (4) use of correlational analysis for evaluation of acquisition in the major dependent variables and; (5) use of noncontingent feedback and rein-forcement as control techniques. The second case, a psychomotor epileptic, also showed therapeutic benefit from SMR training. Clinical information regarding the effect of anticonvulsant medications on the course and therapeutic outcome of SMR training are described. In conjunction with operant conditioning of 12 Hz activity, corresponding changes for other EEG parameters are examined.     

Adaptive and qualitative changes in encoding strategy with experience: evidence from the test-expectancy paradigm

Three experiments demonstrated learners' abilities to adaptively and qualitatively accommodate their encoding strategies to the demands of an upcoming test. Stimuli were word pairs. In Experiment 1, test expectancy was induced for either cued recall (of targets given cues) or free recall (of targets only) across 4 study-test cycles of the same test format, followed by a final critical cycle featuring either the expected or the unexpected test format. For final tests of both cued and free recall, participants who had expected that test format outperformed those who had not. This disordinal interaction, supported by recognition and self-report data, demonstrated not mere differences in effort based on anticipated test difficulty, but rather qualitative and appropriate differences in encoding strategies based on expected task demands. Participants also came to appropriately modulate metacognitive monitoring (Experiment 2) and study-time allocation (Experiment 3) across study-test cycles. Item and associative recognition performance, as well as self-report data, revealed shifts in encoding strategies across trials; these results were used to characterize and evaluate the different strategies that participants employed for cued versus free recall and to assess the optimality of participants' metacognitive control of encoding strategies. Taken together, these data illustrate a sophisticated form of metacognitive control, in which learners qualitatively shift encoding strategies to match the demands of anticipated tests.     

Children Exposed to the Arrest of a Family Member: Associations with Mental Health

The arrest of a parent or other family member can be detrimental to children’s health. To study the impact of exposure to the arrest of a family member on children’s mental health and how said association may change across developmental periods, we examined baseline data for children (birth through 11 years) entering family-based systems of care (SOC). Children exposed to the arrest of a family member had experienced significantly more 5.38 (SD = 2.59) different types of potentially traumatic events (PTE) than children not exposed to arrest 2.84 (SD = 2.56). Multiple regression model results showed that arrest exposure was significantly associated with greater behavioral and emotional challenges after controlling for children’s age, gender, race/ethnicity, household income, caregiver’s education, parenting factors, and other PTE exposure. Further analyses revealed differences in internalizing and externalizing behaviors associated with arrest exposure across developmental levels. This study highlights some of the mental health challenges for children exposed to the arrest of a family member, while adding to our knowledge of how such an event affects children across different developmental periods. More trauma-informed, developmentally appropriate systems need to be in place at all levels to assist children and families experiencing arrest.     

A Sequential Examination of Parent–Child Interactions at Anesthetic Induction

Parental presence is often employed to alleviate distress in children within the context of surgery under general anesthesia. The critical component of this intervention may not be the presence of the parent per se, but more importantly the behaviors in which the parent and child engage when the parent is present. The purpose of the current study was to examine the sequential and reciprocal relationships between parental behaviors and child distress during induction of general anesthesia. Participants were 32 children (3–6 years) receiving dental surgery as a day surgery procedure, and their parents. A modified Child Adult Medical Procedures Interaction Scale-Revised was used to code parent and child behaviors. Initial child distress led to increased parental provision of reassurance and decreased provision of physical comfort. Our findings may inform the development of preoperative preparation programs whereby parents can be appropriately educated about what behaviors will be helpful/unhelpful for their child during induction of general anesthesia.     

The effect of continuous, intermittent, and "placebo" reinforcement on the effectiveness of the conditioning treatment for enuresis nocturna

It has been suggested that intermittent reinforcement may be of value in reducing the rate of relapse in bedwetting conditioning therapy. An experiment was conducted with 30 enuretic boys to examine acquisition and extinction parameters of continuous (100%), intermittent (70% variable ratio), and “placebo” (0%) reinforcement schedules. Reinforced trials were administered as in the typical Mowrer conditioning procedure. Non-reinforced trials were achieved by means of a time delay with the subsequent alarm being activated in the parent's room rather than in the child's room. These procedures required the development of a new conditioning device which could be programmed to automatically administer the desired schedule of reinforcement. The results of the field investigation revealed that continuous reinforcement (CR) and intermittent reinforcement (IR) groups attained acquisition in approximately the same number of trials and with essentially the same success rate. Relapse rate was significantly greater in the CR group than in the IR group. The placebo group showed no improvement over the 6 weeks of treatment. The results of this study may be interpreted as supporting the tenet that relapse can be viewed and treated as an extinction of the acquired response.     

Measurement of Preoperative Anxiety in Young Children: Self-report Versus Observer-rated

The utility of the self-report Children’s Anxiety and Pain Scale Anxiety subscale (CAPS-A) in comparison to the widely used, observer-rated Modified Yale Preoperative Anxiety Scale (mYPAS) in assessing anxiety in children undergoing day surgery procedures was examined. The CAPS-A test-retest reliability, concurrent validity with the Modified Yale Preoperative Anxiety Scale (mYPAS), and sensitivity to expected increases in anxiety at stressful times during the preoperative period were examined. Levels of observer-rated (mYPAS) and self-reported anxiety (CAPS-A) were obtained from 61 children (3 to 6 years) undergoing day surgery procedures. The CAPS-A demonstrated adequate test-retest reliability. Concurrent validity between the CAPS-A and mYPAS scores was poor. The CAPS-A failed to show sensitivity to the expected increases in anxiety at stressful time-points. Thus, an alternative scoring strategy for the CAPS-A was proposed (i.e., child’s refusal to point was scored as high anxiety). Post-hoc analyses demonstrated good concurrent and adequate convergent validity with the alternative scoring strategy.