The role of local context in autoshaping

Three experiments used an autoshaping procedure with pigeons to examine the effects of nonreinforced, nontarget stimuli (ITI-fillers) during the intertrial interval on responding to a reinforced target CS. Experiment 1 replicated a previous demonstration that an ITI-filler that occupied a substantial portion of the ITI attenuated responding to the target CS relative to a group trained with a similar ITI but lacking the ITI-filler. Experiment 2 found that the superiority of responding typically found with a long ITI relative to a short ITI, that is, the trial-spacing effect, can be reversed by imposing a filler stimulus during the ITI in the former condition. Experiment 3, using a within-subject design, found that when one background stimulus condition occupied a majority of the interreinforcement interval, pairings of one target CS with reinforcement that were embedded within this background condition, that is, a long duration local context occurred for this CS, yielded better performance that a second, reinforced, target CS paired with reinforcement in the shorter duration background condition. These results confirmed predictions derived from a local context view of cycle time. Comparator theories of classical conditioning require incorporation of this notion into their conceptualization of effective cycle time in order to explain the present findings.     

Sexual harassment of university students

The sexual harassment of junior, senior, and graduate student women and men by male and female professors, graduate assistants, and staff was investigated to determine students' personal experiences in the classroom, outside the classroom, and in job-related settings. Usable survey responses were returned by 393 students, and incidents were detailed by 38 women and 9 men who noted their responses to the harassment and its effects. Attitudes toward and acceptance of sexually harassing behaviors were measured by a 10-item Tolerance for Sexual Harassment Inventory (TSHI). The frequency of initiation of sexual behaviors was also assessed. More women than men reported being sexually harassed. Male and female perceptions of classroom behaviors were in agreement for most items. Men and women differed significantly on the TSHI, with men more tolerant of sexual harassment than women, and highly significant age differences were found, indicating a greater acceptance of sexual harassment by younger students. There was little difference between male and female students in the frequency of their initiating sexual behaviors. The TSHI was assessed; reliability coefficients and a factor analysis are presented.This research was supported by a grant from the College of Arts and Sciences. We are grateful to Betty Jones and Joan Bentley for their secretarial assistance.     

Sex Differences in Visual Recognition Memory: Support for a Sex-Related Difference in Attention in Adults and Children

The selectivity hypothesis of Meyers-Levy (1989) proposes that cognitive sex differences reflect underlying differences in information processing between males and females. Males are considered to be more likely to organize information in a self-related manner, whereas females are more likely to adopt a comprehensive approach to information processing. We tested this hypothesis in children (10–15 years) and adults using recognition memory tasks. Tests were devised which employed male-oriented objects, female oriented objects, or random objects. In both the child and adult samples, females performed significantly better than males on tests using random and female-oriented objects. Males performed at the level of females only when tested for recognition of male-oriented objects. These results demonstrate that this sex difference is present prior to puberty and support the concept of sex differences in information processing.     

Inter‐confessional relations in nineteenth‐century Syria: Damascus,Homs and Hama compared

This article examines relations between Muslims and Christians in Syria during the later Ottoman period in light of social science literature on ethnicity and ethnic conflict. It argues that the social science literature illuminates the historiography of this question by bringing to the fore historians’ underlying assumptions about religion and ethnicity. By comparing three Syrian towns with contrasting histories of inter‐communal relations, the article argues that religious consciousness in Syria ought not to be understood in strictly primordialist terms. Rather, a more circumstantialist approach is needed where specific conditions transform an otherwise unproblematic situation of religious diversity into one of inter‐confessional hatred and strife.     

An experimental test of the influence of selection procedures on fairness perceptions,attitudes about the organization,and job pursuit intentions

College juniors and seniors (N=184) reviewed a 12-page college recruiting brochure containing information about a large, high-technology corporation. Six versions of the brochure created a 2×3 experimental design in which the compensation and selection practices of the company were manipulated. Compensation and benefit packages were described as being either above or comparable to the industry average. The selection procedure was described as either a biodata inventory, an abstract cognitive test, or an in-basket simulation. We hypothesized that selection procedures would have an indirect, rather than direct, effect on attitudes about the organization and job pursuit intentions. LISREL analyses found good fits for the measurement model (RNI=.97) and the structural model (RNI=.95). All hypothesized paths were significant (p<.05) except for the path between compensation and attitudes about the organization. It is suggested that different selection procedures with comparable levels of validity may have different effects on candidates' attitudes about employers.     

Signaled Delay of Reinforcement: Effects of Postconditioning Manipulation of Context Associative Strength on Instrumental Performance

Two experiments examined the influence of postconditioning treatments of contextual cues on instrumental responding acquired with a signaled delay of reinforcement schedule. In Experiment 1, mere exposure to the conditioning context after instrumental training resulted in an attenuated response rate during an extinction test. In the second experiment, responding was decreased by exposure to the contextual cues or sessions in which signaled noncontingent reinforcements occurred. The greatest response decrement, however, occurred following unsignaled noncontingent food presentations. The results are discussed with respect to the different roles of contextual cues on operant responding.     

Response stereotypy without automaticity in pigeons

Previous research has shown that when pigeons are required to peck each of two keys four times in any order for reinforcement, stereotyped response sequences develop though they are not demanded by the task. The present experiment explored whether the functional value of sequence stereotypy was that sequences became automatized, freeing cognitive resources for other activities. Pigeons were exposed to variants of the task requiring four pecks on each key that differed in the degree of task stringency. Concurrent with the sequence task, pigeons were required to process the color of the keys in order to complete successfully either a matching or a conditional discrimination task. The delay between sequence execution and matching or discrimination choice was varied between 0 and 10 sec. Matching and discrimination accuracy were decreasing functions of delay, but the stringency of the concurrent sequence task had no effect on choice accuracy, suggesting that stereotyped sequences were automatized. However, the matching and discrimination tasks produced substantial disruptions of sequence performance, suggesting that stereotyped sequences were not automatized. The data were taken to suggest that response stereotypy need not imply automaticity.     

Perinatal indicators of sudden infant death syndrome: A study of 34 Rhode Island Cases

Pre- and perinatal characteristics of 34 victims of Sudden Infant Death Syndrome (SIDS) were compared with those controls matched for sex, race, birthdate, and hospital. Data were collected retrospectively from hospital records. Factors which reliably differentiated the SIDS group from controls included low birth-weight, short second stage of labor, fewer years of maternal schooling, and maternal anemia during pregnancy. The constellation of findings was interpreted as reflecting the interaction of physiological predispositions and environmental “setting conditions”, culminating in sudden and unexpected death. The efficacy of a previously established SIDS risk scale was assessed for these cases. Some issues concerning prediction of outcome from perinatal variables are discussed.     

Discrimination training, partial reinforcement, and increases in intertrial interval all reduce response speed in a continuously reinforced key-pecking task

Pigeons were trained in a discrete-trial task in which a response to the center key obtained illumination of a side key and a single response to the side key terminated a trial with either reinforcement or nonreinforcement. Center-key speeds (i.e., reciprocals of latencies) declined with increases in intertrial interval, and it is argued that this effect is related to a decreased likelihood as intertrial interval increases that birds will be near the key at trial onset. Side-key speeds on trials with reinforcement decreased both with increases in intertrial interval and with shifts from continuous reinforcement to either a discrimination or a partial-reinforcement condition. The effects on side-key speeds are compared with effects observed in alley-running tasks using rats, and an interpretation in terms of frustration theory is offered for the results obtained in both types of task.