Individual Interpretation Of Psychoneurotic Inventory Items

The usual finding of greater resistance to extinction (Rn) following partial reinforcement (PR) as compared to continuous reinforcement (CR) has not been well documented with the use of human S s in instrumental conditioning. One hundred twenty male and female college students practiced discrete trials on the pursuit rotor. Resistance was measured by the number of trial S was willing to continue under instructions that S would terminate the experiment. Those S s receiving knowledge of results during 25%, 50%, or 75% of the first 24 trials showed greater Rn (p < .01) than Ss receiving knowledge of results on all 24 trials.     

Partial reinforcement and partial delay of reinforcement effects with 72-hour intertrial intervals and interpolated continuous reinforcement

Three groups of rats ran 108 trials in a straight runway, one trial every 3 days. On the first 44 trials, one group received continuous (and immediate) reinforcement (CRF), a second group 50 per cent partial reinforcement (PRF), and the third group a 50 per cent schedule of partial delay of reinforcement (PDR). All groups received CRF on the next 20 trials, and extinction on the last 44 trials. The PRF and PDR groups extinguished at approximately the same rate, and significantly more slowly than the CRF group.     

Combination Scores for the Humm-Wads-Worth Temperament Scale

In an attempt to assess the degree to which specific stimulus-response associations are gradually acquired in learning a serial list, the order of the middle items was altered during acquisition. Five groups with 16 Ss per group had either no items switched, two items switched after four or eight test trials, or four items switched after four or eight test trials. The nonsense syllables were presented with slide projectors by means of standard serial anticipation procedures. Contrary to hypotheses, there were no overall differences between the four experimental groups and the control in trials to criterion or in total errors. However, although few experimental Ss reported noticing the switch, they made more errors on the trials immediately following the switch in comparison with the control group. These results are interpreted as disconfirming continuous, stimulus-specific association assumptions and supporting noncontinuous, nonassociative approaches.     

Dopamine D2 receptors mediate reversal learning in male C57BL/6J mice

Dopamine is critical for directing goal-oriented behavior. We investigated dopamine D₂ receptor involvement in reversal learning and reinforcement efficacy in mice lacking functional dopamine D₂ receptors and their heterozygous and wild-type littermates. Mice discriminated between two odors to receive a food reinforcer: One odor signaled a reinforcer (S⁺); the other odor signaled no reinforcer (S⁻). After mice learned the S⁺/S⁻ relationship, we inverted the reinforcement contingencies. The necessary number of trials to relearn the new reinforcement contingencies served as our index of reversal learning. Mice lacking functional dopamine D₂ receptors repeatedly failed to inhibit previously reinforced responses during reversal trials. In a separate experiment, mice responded for reinforcers on a progressive ratio schedule of reinforcement. Mice lacking functional dopamine D₂ receptors earned significantly fewer reinforcers than did heterozygous mice. Our results suggest that dopamine D₂ receptors regulate reversal learning and influence the reinforcing efficacy of natural rewards.     

Effects of partial reinforcement on conditioning,conditional probabilities,asymptotic performance,and extinction of the rabbit’s nictitating membrane response

Classical conditioning and extinction of the rabbit nictitating membrane response was investigated under 100 per cent, and two 50 per cent reinforcement conditions (50% equated total trials, and 50% equated reinforced trials) at average intertriai intervals (ITIs) of 30 and 60 sec. It was found that: (1) partial reinforcement reduced the rate of conditioning, but all groups eventually attained asymptomatic performance levels near 100 per cent; (2) first-order and second-order conditional probabilities following reinforced and nonreinforced trials were virtually identical; and (3) no partial reinforcement extinction effect (PREE) was observed.     

Informational and motivational components of social reinforcement

Thirty-six four-year-old children of each sex were tested in a two-choice marble dropping task. There were three Ss in each cell of a 3 × 2 × 2 × 2 factorial design. The factors investigated were: reinforcement condition (Contingent, Yoked, Nonreinforcement), sex, base preference level (strong vs weak), Base Rate Level (high vs low). The dependent variables were: base preference ratio, base rate, preference ratio change, rate change. The contingently reinforced Ss had significantly higher preference change scores than Ss in the other two reinforcement conditions but only at the high base preference level. The Ss in both the contingent and yoked groups had higher rate change scores than Ss in the nonreinforcement group. The results were interpreted as indicating social reinforcement may have two effects, one a cue function and the other an effect on S's motivational system. The results indicate that regression effects do not operate in the two-choice task and that crossing baseline levels of performance is an effective way to control baseline differences in analyses of change in the two-choice task.     

Differential reinforcement of vocal duration

The effects of differential reinforcement of vocal duration were examined in a series of experiments in which each of 28 subjects (Ss) emitted a vowel whenever a light was flashed. In the first phase of each experiment, a penny was dispensed after each of 20 responses. In the second and subsequent phases, only those responses whose durations exceeded a criterion were reinforced; when 10 successive reinforcements were presented, one phase was terminated and the next begun. The criterion for reinforcement in each phase was determined by a different schedule in each of six experiments; it ranged from 80 to 120 per cent of the mean duration of the 10 terminal responses in the prior phase. Differential reinforcement effected a large and systematic change in the duration of vocal responses as long as the responses selected for reinforcement had a sufficiently high probability of occurrence. This requirement was formulated as the difference between the criterion duration and the mean duration of the terminal responses in the prior phase, divided by their standard deviation. This statistic, named the shaping index, was correlated with the number of responses emitted before each phase was terminated. It was found to be large whenever the shaping process failed. Many Ss failed to tact the reinforcement contingency despite marked changes in their vocal behavior and extensive probing by a questionnaire, administered at the end of each session.     

The Rosenzweig picture-frustration study as a measure of reaction to personal Evaluation

The P-F Study was given to three groups of incarcerated delinquents categorized as to parole evaluation status. The hypothesis tested was that those Ss who were being evaluated for parole would give significantly fewer extrapunitive (E) responses than matched Ss who were not being evaluated for parole. Statistical analyses of the data supported the hypothesis.

It was suggested that the probability of external reinforcement may be a basic determinant of responses to the P-F Study and perhaps to projective tests generally.     

Premenstrual tension and personality

The premenstrual symptomalogy (PMT) of 165 students of nursing and midwifery was studied and their personality was assessed using the Eysenck Personality Questionnaire (EPQ). Thirty-four per cent of the Ss showed severe and 42% moderate PMT symptomatology. Ss with severe PMT symptomatology gave significantly higher scores in the neuroticism scale of the EPQ. Abdominal and pelvic pain as well as low back pain, i.e. symptoms of dysmenorrhoea, did not correlate with high neuroticism scores.     

Complex Visual Learning by Rats

Rats’ learning about visual patterns was studied in a computerized Y-maze where wide-angle stimuli were viewed from a distance. Many patterns were available; some were spatially complex and others were more homogeneous figures. Experiment 1 used a discrimination paradigm in which a single S⁺could be paired with any one of 15 different S⁻s. Hooded rats learned successively six such discrimination problems. Their learning rate improved across the series, and comparison with controls suggested that the learning-set did not merely reflect simple habituation. Experiments 2 and 3 employed Dark Agouti rats, again learning many discrimination problems. Each problem comprised a constant stimulus which was paired with stimuli which varied in trial-unique fashion. The version in which the constant stimulus was nonrewarded (S⁻) and the varying stimuli rewarded was performed better than the converse, constant S⁺and varying nonrewarded, reflecting rats’ preference for relatively unfamiliar stimuli. In the constant S⁻task, rats showed substantial within-problem learning when three novel problems were given per day for 20 trials each. Rats are capable of rapid learning about complex visual displays if we engage their natural dispositions to use vision for distal stimuli and to approach relatively unfamiliar cues.     

Positive contrast obtained in reacquisition following interpolation of nonreinforced or partially reinforced trials

Two experiments investigated the effects of shifting from either nonreinforcement or partial reinforcement (PRF) to continuous reinforcement conditions (CRF). In the first experiment, three groups of rats were given food reinforcement under CRF conditions in a runway followed by regular extinction trials (RE), extinction trials where Ss were delayed for 30 sec before entering the empty goal box (DE), or CRF trials where Ss were delayed for 30 sec before entering the baited goal box (DF). Then all Ss were run on the delayed reinforcement condition (DF). In the final delayed reinforcement condition, group DE ran significantly faster than group DF, reflecting positive contrast. In the second experiment, four groups of rats were trained in a runway to receive either 4% or 18% sucrose reinforcers under either PRF or CRF conditions. Then all Ss were transferred to a Skinner box and bar presses were continuously reinforced, with each S continuing to receive the same sucrose concentration as before. The former PRF Ss, regardless of the reinforcer, bar pressed at a significantly higher rate in the Skinner box than the former CRF Ss. The evidence seemed to favor the view that the effectiveness of a reinforcer is not an absolute, unchanging quantity but rather depends on the historical context in which the reinforcer occurs.     

The Measurement of Retinal Fatigue to Achromatic Stimulation–I

Experiment I was conducted to investigate memory in a concept identification (CI) problem as a function of the number of trials that precede the recall task. It was found that the recall performance on the initial trials of CI problems was quite good, but declined rapidly when the recall test was given on later trials. It was pointed out that the bulk of the solutions to CI problems are obtained by Ss during the initial trials where an S has good recall for past stimuli. In Experiment II, recall by Ss in a normal CI problem was compared to the recall by Ss in an incidental learning control group. As the performance of Ss in a normal CI problem was significantly better, it was concluded that Ss actively try to store and retain information during their search for a solution.     

Contrast and stimulus generalization following prolonged discrimination training

Different groups of pigeons received discrimination training in which the reinforcement-associated and extinction-associated stimuli were respectively either (a) a line tilt vs a blank key, (b) a blank key vs a line tilt, or (c) two different line tilts. The high response rates that developed to the positive stimulus in all groups during discrimination learning were maintained over 64 sessions of training. After these sessions, all subjects were tested for stimulus generalization along the line-tilt dimension. Gradients of relative (per cent) generalization around the stimulus associated with reinforcement (so-called excitatory gradients) and around the stimulus associated with extinction (so-called inhibitory gradients) were as steep as they typically are after much briefer training periods. These results do not support several of Terrace's predictions on the basis of the hypothesis that emotional responses develop to the stimulus associated with extinction during discrimination learning with errors, but eventually dissipate after extended training.     

Relationship Between Performance on the Rotter Aspiration Board and Various Types of Tests

A Completely Randomized Factorial analysis was used in assessing the effects of sex of E, sex of S, and age of S on WISC performance. The Ss were 511 male and female, black and white public school children ranging in age from 6 years and 0 months to 14 years and 11 months. The sample was restricted to those referred for possible mental retardation or learning disability. Results indicated that for white Ss, female Es obtained significantly higher scores for the youngest age group, while male Es obtained higher scores for the intermediate age group. It was also found that performance decreased with age and that males generally performed better than females. Implications of the study include increasing sophistication in interpreting test results and avoiding E-S combinations that increase the chance of poor results.     

Effects of stimulus differentiation training upon hypotheses,strategies, and stereotypes in discrimination learning among kindergarten children

Two groups of kindergarten children received stimulus differentiation training either with feedback (experimental Ss) or without (controls), prior to presentation of a series of discrimination-learning problems using blanktrial probes. Results were as follows: Performance of both groups was virtually perfect during differentiation training (less than one error per 1000 trials). In transfer, however, experimental Ss solved more problems, generated more consistent Ss during blank-trial probes, manifested fewer response sets, were more likely to abandon a disconfirmed H, sampled more locally consistent Ss following errors, and retained a confirmed H more frequently than control Ss. Experimental Ss also manifested strategy Sys (hypothesis sampling systems) predominately, while controls generated only stereotypes. Findings were discussed in relation to theoretical perspectives derived from Piagetian theory and developmental learning theory.     

The effect of S− on observing behavior

Eight pigeons were run on a one-key, discrete-trials observing procedure. Pecks during a trial produced S⁺ and S^?, colored key lights which signalled whether the trial would end with response-independent grain reinforcement or nonreinforcement. S⁺ and S^? were produced on a VI schedule which began operating at the onset of the trial. In the main experimental condition, only a response preceded by at least 6 sec of nonresponding could produce S^? on nonreinforced trials; any response which satisfied the VI requirement produced S⁺ on reinforced trials. This procedure allowed the birds to produce S⁺ on reinforced trials with or without producing S^? on nonreinforced trials. The subjects learned to produce fewer S^?s over sessions, indicating that S^? had a punishing effect on observing. The results were taken as evidence for the conditioned reinforcement hypothesis of observing and against the uncertainty reduction hypothesis.     

Changes Accompanying Practice upon Successive Samples of Verbal Material

Three groups of rats received either continuous, partial, or zero reinforcement in a first acquisition phase which was followed by an extended extinction phase. Then all Ss were given a reacquisition phase under continuous reinforcement conditions followed by a second extinction phase. While the usual partial reinforcement extinction effect (PREE) was found during the major part of the first extinction phase, it disappeared during the last few trials of that phase. No PREE was obtained during the second extinction phase in any of the three sections of the runway. The abolition of the PREE was attributed to the extinction of the r_F-s_F mechanism in the partial reinforcement group.     

The Best Years of Life: A Study in ranking

The relationship between temporal behavior (as measured by the method of reproduction) and the relative acquisition rate of discrimination-reversal learning was investigated in 52 sixth-grade students (22 boys, 30 girls).

The results indicate that (a) temporal performance tends to be less variable than learning performance, (b) a significant, negative correlation exists between mean time estimation scores and mean learning scores, (c) relatively fast learning is associated with relative overestimation of time, and (d) relatively slow learning is associated with relative underestimation of time. No sex differences were found.

These results are in contrast with results reported by Montare with adult Ss whose underestimation was associated with fast learning and overestimation with slow learning. It is theorized that perhaps these results represent a developmental pattern in learning which shifts from a predominance of inhibitory processes underlying relatively fast learning during childhood towards a predominance of excitatory processes necessary for relatively fast learning in adulthood.     

Self-control behavior in hyperactive and nonhyperactive children

This study was aimed at evaluating the self-control behaviors of hyperactive (HA) and nonhyperactive (NHA) first-grade pupils under conditions of repeated failure on a previously learned concept formation task. Subjects were divided into HA and NHA groups on the basis of their scores on the Conners (1969) Teacher Rating Scale. During the training stage of the experiment the children learned a concept formation task under a schedule of contingent positive reinforcement. In the test stage they performed the same task but under a negative noncontingent reinforcement schedule. The results revealed no differences in initial rate of learning the task between the groups. After the introduction of the negative noncontingent reinforcement schedule, however, the HA group showed a marked decrease in the use of effective problem-solving strategies. The HA children's performance on the concept formation task was accompanied by the emission of negative self-evaluations and solution-irrelevant statements. The NHA group used significantly more statements showing useful goal directed cognitive mediations than the HA children. The results suggested that HA children may have deficits in self-control skills.Grateful acknowledgment is made to the two anonymous reviewers whose insightful comments were very helpful in producing the final form of this paper.     

阅读范文对小学生作文成绩的影响

为考察阅读范文是否能够提高三年级小学生记叙文写作的成绩,在建立低年级小学生记叙文写作评价指标的基础上,选择1篇完整范文并设计8篇不同类型的不完整范文,选取300名三年级小学生为被试进行了实验研究。实验结果表明:(1)阅读完整范文和联结内容式、补充中间式、补充开头式、补充结尾式等不完整范文能够明显提高小学生记叙文写作结构分项的成绩,阅读其他4种类型的不完整范文作用不明显。(2)阅读完整的和8种不完整范文均能明显提高小学生在记叙文写作内容分项的成绩。(3)除了补充开头式、补充中间和结尾式两种不完整范文之外,阅读其他7种范文均能明显提高作文词句分项的成绩。(4)阅读范文对避免写作中出现错别字、错用标点符号和病句无显著作用。