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141.
This experiment tested the transitivity of hens' choices between response requirements differing in both form and number. In a concurrent second-order schedule procedure, 6 hens chose between two alternatives by making either key-peck or door-push responses. The reinforcement rates on the two alternatives remained constant and equal throughout conditions, but the number of responses (i.e., key pecks or door pushes) required on each alternative was varied by changing the second-order (fixed-ratio) requirements. The preferences obtained from two pairings of response requirements allowed prediction of the preferences expected in a third pairing. No intransitivities were found, implying that the response requirements lie on a common unitary scale of value. For response-based measures, the obtained preferences varied evenly around perfect, multiplicative prediction, and all satisfied strong transitivity, implying an underlying interval scale of value. For time-based measures, only moderate transitivity was satisfied, implying only an ordinal scale of value. Time-based measures were confounded with the differing times taken to complete each response requirement. The existence of such scales indicates that direct comparisons of different response requirements may be possible. 相似文献
142.
Self-categorization theory suggests thatwhen asocialidentity is salient,grouporiented behavior willensue. Thus, women should be likely to actoutagainstgender discrimination when their social identity as women is salient. However,self-categorization theory has typically defined asocial identity along stereotypes, which may serveinstead to maintain the status quo. Two studiestherefore examined the effects of two different social identities ontaking action against discrimination. Participants werefemale students (Anglo American (93%), African American(2%), Native American (2%), Hispanic (1%), Asian American (1%)and Other (1%)). Study 1 examineda structural model and Study 2 examined the causalrelationships, both hypothesizing that a social identitybased on stereotypes would be associated with less collective action than a social identity basedon social experiences. The hypothesis was supported, andimplications for expanding definitions of socialidentities were discussed. 相似文献
143.
Matthew J. Sharps Brandon T. Foster Sandy S. Martin Michael A. Nunes 《Current Psychology》1999,18(3):241-253
Previous studies have demonstrated that older adults can use visually distinctive cues to enhance their spatial memory performance
and their recall of the identities of items located in space. Other research has shown that older adults can also use relational
information to enhance recall. The relationship between relational and visuospatial support for memory across the adult lifespan
is complex and has been little explored. In the present study, this relationship was examined in tasks that measured free
recall for item sets possessing different degrees of visuospatial and relational support for recall. It was predicted that
both types of support would enhance older adult recall relative to that of the young, and that the two types of support would
synergize. The results were generally consistent with these predictions. These findings show that older adults can use relatively
simple relational or visuospatial support systems to enhance free recall significantly.
This research was supported by Grant AGI 1605, National Institute on Aging. 相似文献
144.
Foster JK Meikle A Goodson G Mayes AR Howard M Sünram SI Cezayirli E Roberts N 《Memory (Hove, England)》1999,7(5-6):715-732
Healthy young female participants were tested on a measure of delayed verbal recall and then received volumetric Magnetic Resonance Imaging (MRI) scans. The analysis of the MRI scans focused on the volume of the hippocampus. Left hippocampal volume was negatively associated with the level of delayed verbal recall performance. This relationship was confirmed in further testing. This finding is consistent with a previous report of a similar relationship in healthy elderly individuals, but not in patients with Alzheimer's disease, in whom the opposite relationship was observed. An explanation of these findings in terms of impaired neural pruning of the hippocampus is advanced, whereby insufficient pruning of the hippocampus during childhood and adolescence (following adequate growth) may lead to reduced mnemonic efficiency. 相似文献
145.
Kratochwill T Alden K Demuth D Dawson D Panicucci C Arntson P McMurray N Hempstead J Levin J 《Journal of applied behavior analysis》1974,7(4):629-633
It is argued that the analysis-of-variance model is inappropriate for assessing treatment effects in single-subject designs. In particular, such designs are demonstrated to violate the crucial assumption concerning the statistical independence of observations. Alternative methods of data analysis are suggested. 相似文献
146.
The movement-activated recording monitor (MARM) is a small noninvasive device that continuously detects, accumulates, and stores the amount of motor activity produced during sequential time intervals of designed duration. If motor activity totals are recorded every 15 min, the MARM is capable of calculating and storing 96 data points/day for 5.33 days. The MARM employs large-scale-integrated complementary-metal-oxide integrated circuits. To date, application has been primarily limited to psychiatric investigations, but the MARM is readily applicable for other time-motion studies of human or animal subjects. 相似文献
147.
An inexpensive multichannel event counting digital recording system has been designed for compatibility with automated data analysis equipment. For as many as 16 channels, events are simultaneously summed over preselected repetitive time intervals and recorded. Each data entry is marked with the time of day and a code identifying each channel’s data. The data is formated to be computer compatible and is logged on inexpensive readily available digital magnetic tape cassettes. 相似文献
148.
Three rats were trained on a temporally defined avoidance schedule logically similar to a fixed-interval, limited-hold positive reinforcement schedule. This avoidance schedule was composed of time periods during which responses had no scheduled consequences alternating with time periods during which a response precluded shock. As with fixed-interval length and response rate on positive reinforcement schedules, an inverse relationship was obtained between the length of the no-consequence interval and response rate during the no-consequence interval. An inverse relationship was also obtained between the length of the no-consequence interval and the per cent of shocks avoided. A rate increase within the no-consequence interval, similar to that typically produced by fixed-interval positive reinforcement procedures, was displayed by one of the rats where the no-consequence interval was at intermediate values and frequency of shock was relatively high. The introduction of a discriminative stimulus correlated with the avoidance interval produced typical discriminated avoidance behavior as well as alterations in temporal patterning of responses during the no-consequence interval in the two rats exposed to this procedure. These alterations in temporal patterning disappeared when the discriminative stimulus was removed. The results were consonant with those reported in the literature involving food reinforcement and fixed-interval, limited-hold schedules. 相似文献
149.
Two experiments investigated the impact of responding to recognition test items that do not include a correct alternative. In Experiment 1, subjects who were given exclusively incorrect response alternatives were less likely than control subjects to favor the correct alternatives on a second recognition test. Analysis of subjects’ responses indicated that commitments, rather than distractor familiarity, was the main source of this effect. In Experiment 2, an impairing effect of committing to an incorrect alternative was observed even when the initial distractors were excluded from the final test. Thus, this decreased performance cannot simply be attributed to a bias toward remaining consistent. One interpretation of these results is that committing to a distractor causes subjects to remember a false detail that can interfere with their later ability to access the original information. Other potential theoretical and applied implications of these results are explored. 相似文献
150.
The literature indicates that the IQs and school performance of children tend to decline with increasing order of birth. A hypothesis is here presented that the effect of birth order upon intellectual performance may result from an increasing probability of maternal immune attack upon the fetal brain in utero with order of parity. In support of this hypothesis, evidence is adduced from the literature that the fetal brain is antigenic, that fetal antigens may reach the immune system of the mother, that the incidence of maternal sensitization to fetal antigens increases with parity, that antibodies may readily cross the placenta and reach the fetal brain, that antibodies can be highly teratogenic, and that certain antibodies may damage, in a lasting way, the structure, function, and learning capacity of brains in experimental animals and human infants. 相似文献