The Clinical Plus the Experimental Emphasis in Elementary Work in Psychology

Forty-two Ss were run in one experimental and in two control conditions. The Ss recalled a short story immediately after reading it and again 24 hours later. All Ss were monitored on two physiological variables during reading. The experimental group was subjected to a 0.2-second delayed auditory feedback in the middle section of the story. One control group received no special treatment; the other received shock at the point in the story at which the experimental group received delayed auditory feedback. Both the experimental group and the control group that received shock showed marked changes in GSR measurements during the reading of the middle section of the story. The immediate memory of the story was significantly poorer for the experimental group as contrasted with that for each of the control groups. For accuracy of delayed memory, there were no significant differences among the three groups.     

An Exploratory Study of Discrimination of Composer Style

With an alternate study-test procedure, 254 college students attempted either to free-recall or rearrange in order items of an 11-CVC serial list to a criterion of two consecutive perfect trials. Ss learned the list with or without an isolate which was placed on each of the 11 serial positions. The main findings were as follows: (a) While the reconstruction condition required fewer study trials to criterion than the free-recall condition, the isolation effect occurred equally in both conditions. (b) The isolation effect was a function of the serial position; the effect was greater at the central positions than at the peripherals in free-recall and this trend was essentially reversed in the reconstruction condition. (c) In free-recall, no reliable and systematic spreading effect was obtained for the items immediately preceding and following the isolate; however, a positive spreading effect occurred concurrently with the isolation effect in the reconstruction condition. The isolation effect has been accounted for by a selective rehearsal assumption. Implications regarding the functional cues in serial order learning and the isolation effect in serial learning are suggested.     

Serial rote-learning: Incremental or all-or-none?

If the associative connections in a serial list are acquired in an all-or-none fashion, rather than gradually with every trial adding an increment of associative strength, then changing the serial order of the middle items in the list during the course of practice should have no effect on the rate of learning the list as a whole or even of the particular items that have been interchanged. Thirty subjects learned a serial list by the anticipation method. The middle items of the list were reversed in serial order approximately half-way through the number of trials required for mastery. The subjects took no longer to learn the list and made no more errors than did 30 control subjects for whom there was no change in serial order. The serial-position curves of the two groups were almost identical. It was also shown that the learning “curves” of single items in the series, when plotted for individual subjects do not reveal a gradually increasing probability of the correct response, but show instead a sudden jump on one trial from the chance guessing level to a level close to 100 per cent, correct responses. The results are consistent with a non-incremental theory of serial learning.     

The Levels Hypothesis and the Study of Stimulus Value of Projective Test Items

Summary

Anagrams and semantic differential (S-D) test responses of Ss for whom words were “loaded” on a free association test were compared with those of Ss for whom the words were neutral. No differences in rate of word building or mean productivity of the two groups on the anagrams test were found. Mean S-D scale values similarly failed to differentiate between the two groups. However, when numbers of neutral (0) and extreme (+3 and ?3) responses were compared, “loaded” Ss were found on the whole to rate words more neutrally or more positively. The conclusion was that the stimulus value of the words in the associative condition could not be directly determined from responses in other conditions. The strategy of studying stimulus value of projective test items by using those items as stimuli on tests eliciting different levels of response was, therefore, questioned. Several other related experimental strategies which may mix response levels were also discussed and more appropriate techniques were suggested.     

Task-set reconfiguration with predictable and unpredictable task switches

Participants switched frequently between high/low and odd/even classification of a digit. The interval between a task cue and the next digit varied between blocks. In Experiment 1, the task switched predictably every two, four, or eight trials. In Experiment 2, switching predictably every four trials was compared with random switching. With predictable switching, the cost was limited to the first trial of a run. Random switching produced a more gradual approach to asymptotic performance. After one performance, control processes attenuate the resulting change in task-set bias if a further switch is likely, but this strategic modulation is soon overwhelmed by task-set priming through further performances. Preparation reduced switch costs but not interference from the irrelevant attribute: Control of interference appears to be reactive, not proactive. Switch costs did not increase with run length, suggesting that retrieval of the task set last associated with the stimulus did not contribute to switch costs.     

The futility of explicit knowledge of a sequence of tasks

In an experiment that combined the task-shifting methodology with a serial reaction-time task, three groups of participants had to shift among a set of four tasks that were arranged in regular sequences of length eight. Two groups of participants were given explicit knowledge about the sequence of tasks. To ensure that the knowledge of the sequence was referred to in each trial, one group was asked to verbalise the forthcoming task (verbalisation group), whereas the other group had to detect trials that deviated from the learned sequence (detection group). Participants of a control group were given no information about the sequence of tasks. In addition, for all experimental groups in half of the blocks of trials external precues were presented which indicated the forthcoming task. The control group exhibited substantial task-shifting costs that were greatly reduced by the presentation of precues. Participants of the explicit-knowledge groups showed no indication that explicit knowledge resulted in advance preparation of the forthcoming task. In addition, the effect of the precues depended on the secondary task that had to be performed on the basis of explicit knowledge. Whereas for the detection group precues reduced shift costs to the same degree as for the control group, the verbalisation group showed no precueing benefits at all.     

KNOWLEDGE OF THE ORDINAL POSITION OF LIST ITEMS IN RHESUS MONKEYS

Abstract —What is learned during mastery of a serial task: associations between adjacent and remote items, associations between an item and its ordinal position, or both? A dear answer to this question is lacking in the literature on human serial memory because it is difficult to control for a "naive" subject's linguistic competence and extensive experience with serial tasks. In this article, we present evidence that rhesus monkeys encode the ordinal positions of items of an arbitrary list when there is no requirement to do so. First, monkeys learned four nonverbal lists (1–4). each containing four novel items (photographs of natural objects). The monkeys then learned four 4-item lists that were derived exclusively and exhaustively from Lists 1 through 4, one item from each list. On two derived lists, each item s original ordinal position was maintained. Those lists were acquired with virtually no errors. The two remaining derived lists, on which the original ordinal position of each item was changed, were as difficult to learn as novel lists. The immediate acquisition of lists on which ordinal position was maintained shows that knowledge of ordinal position can develop without the benefit of language, extensive list-learning experience, or explicit instruction to encode ordinal information.     

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.     

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 semantic relatedness on immediate serial recall and serial recognition

The present study examined the effects of semantic relatedness on immediate serial recall and serial recognition. Each participant received either blocked or randomly intermixed serial recall or serial recognition trials. Replicating the findings of previous studies (e.g., Saint-Aubin, Ouellette, & Poirier, 2005), semantic relatedness boosted percentage serial recall but also increased order errors, after taking into account the proportion of correctly recalled items, regardless of their orders, in serial recall trials. In serial recognition trials, participants' responses were slower and less accurate for related lists than for unrelated lists. There were intraindividual correlations among order memory measures in serial recall versus serial recognition trials. The implications of these findings for item redintegration theories are discussed.     

Value Hierarchies of French Catholics Committed to the Fight Against AIDS

Summary

An attempt was made to create the social satiation effect via vicarious learning. Second-grade boys and girls from middle class homes in a Jerusalem school observed other children being administered a short treatment in which the stimulus word Yafeh (“Good”) was presented by E twice (low-satiation) or 20 times (high-satiation). Immediately thereafter, E administered to the observers a 75-trial binary discrimination task, to test the efficacy of the word Yafeh as a reinforcer. The control groups consisted of Ss treated and tested by the same E. A typical satiation effect (i.e., decreased performance of the group presented with 20 stimuli) was observed for the control groups, but no difference was found between groups of Ss observing the high- and low-satiation treatments. It was thus concluded that social satiation had not been learned vicariously. The post-treatment inquiry on the Ss who were observed by the experimental Ss revealed that these children were aware of the frequency of stimuli presented in the treatment. However, the cognitive mechanism hypothesized to mediate the social satiation effect—perceived lack of contingency—was not confirmed by their verbal reports.     

Errorless learning of a conditional temporal discrimination

In the present study we extended errorless learning to a conditional temporal discrimination. Pigeons' responses to a left-red key after a 2-s sample and to a right-green key after a 10-s sample were reinforced. There were two groups: One learned the discrimination through trial and error and the other through an errorless learning procedure. Then, both groups were presented with three types of tests. First, they were exposed to intermediate durations between 2 s and 10 s, and given a choice between both keys (stimulus generalization test). Second, a delay from 1 s to 16 s was included between the offset of the sample and the onset of the choice keys (delay test). Finally, pigeons learned a new discrimination in which the stimuli were switched (reversal test). Results showed that pigeons from the Errorless group made significantly fewer errors than those in the Trial-and-Error group. Both groups performed similarly during the stimulus generalization test and the reversal test, but results of the delay test suggested that, on long stimulus trials, responding in the errorless training group was less disrupted by delays.     

Learning a list for free recall: Selective reminding versus the standard procedure

Almost all free-recall experiments involve an acquisition phase in which the set of to-be-learned items is presented repeatedly in its entirety. Two experiments are described that pit this standard procedure against theselective reminding procedure (Buschke, 1973), wherein only items incorrect on trial n are presented again on trial n+ 1. The two methods were virtually identical in terms of (1) trials to reach an acquisition criterion of one errorless recall, (2) number of items correct on each recall trial during acquisition, (3) number of items correct on a 3-week delayed-recall test, (4) number of items correctly relearned after the 3-week retention interval, (5) extent of subjective organization on all retention tests, and (6) pattern of errors over all test trials. These results generalized to both single-category and random lists of 20 words, and were thoroughly consistent across the two experiments. However, the standard procedure required that many more items be presented over trials, and more subjects failed to learn the list within 1 h using the standard procedure. Because the selective reminding procedure is more efficient and has no apparent drawbacks, it is recommended that memory researchers switch to selective reminding as the preferred way to teach a subject a free-recall list.     

Stimulus hierarchy generalization in systematic desensitization

A group of snake phobic Ss were desensitized to the first 5 items of a standard 7 item snake fear hierarchy in which the items were ordered on the basis of distance from a snake. This group and a no-treatment control group (which did not receive the desensitization) were treated for fear of all the hierarchy stimuli in terms of ratings both before and after the desensitization. The Ss rated their fear responses to all the stimuli as presented to them in (1) real form (2) by slide, and (3) in imaginal form. The results verified all four experimental hypotheses: (1) The experimental Ss showed greater fear reduction than the control Ss to both the training stimuli (the stimuli on which desensitization done) and the generalization stimuli (the other two stimuli), (2) The systematic desensitization (SD) group showed (a) more fear reduction to the last training stimuli than to the lower generalization stimulus and (b) more to the latter than to the higher generalization stimulus, (3) The SD group showed less fear reduction to the generalization stimuli in their real form than in both the slide and imaginai modalities (in the desensitization each stimulus presentation was done first in slide form and then in imaginal form), and (4) There were significant overall individual differences in generalization of fear reduction to the generalization stimuli.     

The Induction of Color Blindness by a Technique of Hypnotic Suggestion

The relative efficacy of auditory feedback, varying in the amount of information contained in the feedback signal, for the self-control of heart rate (HR) was determined by comparing groups of 10 Ss who received either: (a) continuous proportional feedback, (b) discontinuous proportional feedback, (c) binary feedback, (d) heart sounds, or (e) no feedback. At each of two sessions Ss were given eight trials in each direction on which they were to raise or lower their HR.

Without regard to the amount of information contained in the signal, presentation of auditory feedback aided Ss in raising HR relative to Ss who received no feedback; however, feedback did not yield an advantage in lowering it. These results suggest that perhaps the informing quality of feedback is multidimensional and also that perhaps the mechanisms involved in acceleration and deceleration of HR may be different.     

Retroactive inhibition as a function of similarity of meaning in free-recall learning

Summary Retroactive inhibition in free-recall learning was measured under six degrees of meaningful similarity: zero, low, low-medium, medium, medium-high, and high. For each degree of similarity, an experimental and a control group of 20 Ss each learned a list of 20 unrelated adjectives through three cycles of alternate study and unpaced free recall. Immediately thereafter, the experimental group learned a second list of 20 adjectives, while the control group rested. Finally, a single recall trial was administered to both groups to measure first-list retention. The results have revealed a relationship which is at variance with the relationships observed in both serial and paired-associate learning but conforms to the curvilinear function earlier formulated by Skaggs and Robinson. Fresh arguments are offered in defence of the Skaggs-Robinson hypothesis.     

Sequential planning in rhesus monkeys (<Emphasis Type="Italic">Macaca mulatta</Emphasis>)

In the current study, we examined the planning abilities of rhesus monkeys (Macaca mulatta) by training them on a five-item list composed of coloured photographs and then testing them on switch and mask trials. In contrast to previous studies where monkeys made responses using a joystick, in the current study, monkeys made responses directly to a touch screen. On switch trials, after a response to the first list item, the on-screen positions of two list items were exchanged. Performance on trials in which the second and third list items were exchanged was poorer compared to normal (non-switch) trials for all subjects. When the third and fourth items were exchanged, however, only one subject continued to show performance deficits. On mask trials, following a response to the first item, the remaining items were covered by opaque white squares. When two items were masked, all four subjects responded to each masked item at a level significantly above chance. When three items were masked, however, only one subjected was able to respond to all three masked items at a level significantly above chance. The results of the present study indicate that three of our four monkeys planned one response ahead while a single monkey planned two responses ahead. The significance of these findings is discussed in relation to previous studies on planning in chimpanzees and monkeys.     

Unchained Memory: Error Patterns Rule out Chaining Models of Immediate Serial Recall

Many models of serial recall assume a chaining mechanism whereby each item associatively evokes the next in sequence. Chaining predicts that, when sequences comprise alternating confusable and non-confusable items, confusable items should increase the probability of errors in recall of following non-confusable items. Two experiments using visual presentation and one using vocalized presentation test this prediction and demonstrate that: (1) more errors occur in recall of confusable than alternated non-confusable items, revealing a 'sawtooth' in serial position curves; (2) the presence of confusable items often has no influence on recall of the non-confusable items; and (3) the confusability of items does not affect the type of errors that follow them. These results are inconsistent with the chaining hypothesis. Further analysis of errors shows that most transpositions occur over short distances (the locality constraint), confusable items tend to interchange (the similarity constraint), and repeated responses are rare and far apart (the repetition constraint). The complete pattern of errors presents problems for most current models of serial recall, whether or not they employ chaining. An alternative model is described that is consistent with these constraints and that simulates the detailed pattern of errors observed.     

The effects of verbal approval and disapproval upon the performance of third and fourth grade children on four subtests of the Wechsler intelligence scale for children

The purpose of this study was to determine the effects of three modes of test administration upon the performance of third and fourth grade boys and girls on four subtests of the Wechsler Intelligence Scale for Children. Ninety Ss were randomly assigned to three groups, two experimental and one control. Each of the three groups was subdivided to enable two examiners to administer the same treatment. The Approval group was given verbal approval after the first response in each subtest and between subtests. Verbal disapproval was given in the same sequence for the Disapproval group. The Neutral group received the standard test administration without any intended approval or disapproval. For both examiners the Approval group performed significantly higher (p < .05) than the Disapproval group; the Neutral group performed higher than the Disapproval group and lower than the Approval group, although the differences were slightly less than significant at the .05 level.     

Auditory List Memory in Rhesus Monkeys

Auditory memory of 2 rhesus monkeys was tested in a serial probe recognition task. Lists of four environmental or natural sounds were followed by a retention interval and a test. The test matched one of the list items on half of the trials. The retention interval was varied across sessions. Six experiments showed similar results and changes in the serial position function. At short retention intervals, there was good memory for first list items (primacy effect) and poor memory for last list items. At intermediate retention intervals, memory improved for last list items (recency effect). At long retention intervals (20 s and 30 s), the recency effect was strong, and the primacy effect had dissipated. These auditory primacy and recency effects and their changes with retention interval were opposite to those for visual memory. Implications for processes and mechanisms of memory are discussed.