Response acquisition and fixed-ratio escalation based on interresponse times in rats

The effectiveness of a fixed‐ratio (FR) escalation procedure, developed by Pinkston and Branch (2004) and based on interresponse times (IRTs), was assessed during lever‐press acquisition. Forty‐nine experimentally naïve adult male Long Evans rats were deprived of food for 24 hr prior to an extended acquisition session. Before the start of the session, three food pellets were placed in the magazine. Otherwise, no magazine training, shaping, nor autoshaping procedure was employed. The first 20 presses each resulted in the delivery of a 45‐mg food pellet. Then, the FR increased (2, 4, 8, 11, 16, 20, 25, 30) when each IRT in the ratio was less than 2 s during three consecutive ratios. Sessions lasted 13 hr or until 500 pellets were earned. On average, rats reached a terminal ratio of 11 (mean) or 16 (median) during the first session. Seven rats reached the maximum value of FR 30 and only one rat did not acquire the response. In most rats, a break‐and‐run pattern of responding characteristic of FR schedules began to develop in this acquisition session. Subsequently, the ratio‐escalation procedure continued during daily 2‐hr sessions. In these sessions, the starting ratio requirement was set at the terminal ratio reached in the previous session. Using this procedure, over half (26) of the rats reached the FR 30 requirement by the fourth session. These data demonstrate that a ratio‐escalation procedure based on IRTs provides a time‐efficient way of establishing ratio responding.     

Solving and Creating Raven Progressive Matrices: Reasoning in Well- and Ill-Defined Problem Spaces

We studied the development of creative cognition in children ranging from nursery school to Grade 6 (4–12 yr old, N = 511), performing a problem generation task. The task involved inventing a novel item for a classical problem solving task they had completed beforehand: the Raven Progressive Matrices (RPM). This task and the generating task both comprise matrixes of components, to which a set of transformational relations are applied; only in the first case these are inferred to solve a puzzle, but in the second they are invented to create one. We analyzed the matrixes invented in the generation task and compared them to those of the original solving task. We observed that (a) both in solving and generation, the ability to combine more than 1 relation increased with grade level, (b) within all 8 grades, except Grades 3 and 6, performance was uncorrelated between both tasks, (c) relations that were applied in the generation task often did feature in the solving task, and (d) relations occurring in both tasks were applied with different frequencies. Overall, we conclude that standard problem solving ability is not a precondition for creative reasoning and that the comprehension of relations between components featured in solving task differs from that applied in generation.     

The Relationship Between Implicit Beliefs,Anxiety, and Attributional Style in High-Level Soccer Players

We assessed the role of parental behaviors on sport performance anxiety. Measures of trait anxiety, parental pressure, and parent-initiated motivational climate were administered to youth swimmers throughout the season. High parental pressure within either a low mastery or a high ego motivational climate was associated with the highest levels of anxiety at all time points. An early-season, high-pressure/low-mastery combination was also associated with relative increases in anxiety over the season, whereas high pressure within a high mastery climate was associated with relative decreases. Results indicate that parental pressure can have differential effects depending upon motivational climate.     

Experimentation with Group Techniques with Ego-Disturbed Mothers

Abstract

Psycho–educational groups (PEGs) have been shown to be a particularly effective form of treatment for patients classified under the rubric of severely and persistently mentally ill (SPMI). However, recent surveys suggest that certain professionals, such as nurses and clinical psychologists, called on to conduct these groups may have limited to no training. This study tested three methods (self–instructional, workshop, and workshop plus clinical supervision) designed to provide on-the-job training to practicing clinicians. Specifically, training was based on two manuals; one that operationalized the basic knowledge and skills needed to run an effective PEG and the second being a commonly used PEG program for symptom management targeted at SPMI patients. Eight nurses from four adult units at a state psychiatric hospital initially received self–instructional or workshop training and then conducted a 12–session symptom management PEG composed of four to five SPMI patients (e.g., schizophrenia, schizoaffective or major depression disorders). In a second wave of additional training, nurses received workshop training or clinical supervision and then conducted a second PEG. Differences between training methods were assessed by nurse– and patient–completed measures that tapped the knowledge and skills emphasized in the symptom management and PEG (nurses only) manuals. Results indicated limited support for the superiority of the workshop method on the nurse measures alone. Implications for training working professionals in group treatments and assessing outcomes with chronic SPMI patients are discussed.     

Center-Based Care for Young Children: Examining Predictors of Quality

The authors collected information from caregivers, trained observers, and parents to investigate quality elements in child-care programs designed for young children in center-based settings. Participants were 75 parents of children aged 15 to 36 months and their caregivers from 13 child-care centers in a southeastern state. Observers collected indicators of program quality and process and structural quality indicators, including adult-child ratio, group size, use of planned activities, use of child-designated space, housekeeping activities, and caregiver-child interactions. Participants responded to questions regarding their child-rearing beliefs, social support networks, perceived stress levels, and demographic characteristics. The best predictors of higher quality care and sensitive caregiver-child interaction in centers were specialized caregiver training, higher adult-child ratios, use of planned activities, and less perceived stress by caregivers. Implications of these findings are discussed.     

The Effect of Differential Post-Weaning Environment on the Rigidity of an Animal's Behavior

Seventy-two first, second and third grade boys and girls were administered seriation problems involving different combinations of shape and color variation. Success rates and latency scores were influenced by shape variation, but not by color variation or grade level. The failure to obtain predicted interactions between the effects of grade level and stimulus variation was attributed to the clarity of the relevant stimulus dimension.     

An Informational Analysis of Active Kinesthesis as Measured by Amplitude of Movement

5 blindfolded Ss were required to make absolute judgments of the extent to which their extended right arm was voluntarily moved in the horizontal plane. The first experiment entailed the judgment of 20 different amplitudes and from these data a scale of equal discriminability was constructed for each S. From these individual scales amplitudes were selected for 5 additional absolute judgment experiments where the number of amplitudes were varied from 4 to 16. Analysis of the mean equal discriminability scale showed that kinesthetic sensitivity varied over the continuum of movements. The primary analysis of information transfer between number of amplitudes of movement and responses indicated that information transfer varied considerably over the 5 experiments with a maximum transfer of 2.48 bits occurring when 16 amplitudes were used. These results were discussed in terms of the possible cues involved in movement discrimination and whether kinesthetic cues could be used in a closed-loop model of voluntary movement control.     

Psychophysics of Kinesthesis

A horizontal straight-arm movement was used to determine the relationship between the physical stimulus continuum and the psychological continuum of kinesthetic extent of arm movement. A power function with an exponent of 1.075 best described this relationship. In addition, to classify extent of movement as belonging to either a prothetic or metathetic continuum, the category scale was derived. According to the functional criteria described by Stevens (1957), extent of movement was subserved by a metathetic process which would indicate that, for the present task, judgments were made through the use of positional cues rather than amplitude cues.