Selective attention and cerebral dominance in perceiving and responding to speech messages

The effect of attention on cerebral dominance and the asymmetry between left and right ears was investigated using a selective listening task. Right handed subjects were presented with simultaneous dichotic speech messages; they shadowed one message in either the right or left ear and at the same time tapped with either the right or the left hand when they heard a specified target word in either message. The ear asymmetry was shown only when subjects' attention was focused on some other aspect of the task: they tapped to more targets in the right ear, but only when these came in the non-shadowed message; they made more shadowing errors with the left ear message, but chiefly for non-target words. The verbal response of shadowing showed the right ear dominance more clearly than the manual response of tapping. Tapping with the left hand interfered more with shadowing than tapping with the right hand, but there was little correlation between the degree of hand and of ear asymmetry over individual subjects. The results support the idea that the right ear dominance is primarily a quantitative difference in the distribution of attention to left and right ear inputs reaching the left hemisphere speech areas. This affects both the efficiency of speech perception and the degree of response competition between simultaneous verbal and manual responses.     

Reinforcement of spaced responding in a simultaneous discrimination

Pigeons were exposed to three stimuli simultaneously with responses reinforced according to differential-reinforcement-of-low-rate schedules. Responses to one stimulus (the positive stimulus) that were spaced appropriately resulted in food presentation. The variables manipulated were the time parameter of the schedule (5, 10, 20, 30 sec) and the consequences of responding to the other two stimuli (the negative stimuli). The percentage of the total responses that occurred to each stimulus was independent of the schedule value but was dependent on the consequences of responding to the negative stimuli. If responses to both reset the schedule timer, responding was confined largely to the positive stimulus. If responses to neither had scheduled effects, the birds were more likely to respond to those stimuli. Responding to one negative stimulus could be selectively attenuated by having responses to that stimulus alone reset the timer. With the schedule time value held constant, the absolute rate of responding to the positive stimulus was either stable or decreased with maintained exposure; it did not change as a function of increases or decreases in responding to the negative stimuli. Rather than interacting and affecting each other, responses to the three stimuli were controlled independently by their relation to reinforcement. There was no evidence that responses to the negative stimuli mediated the spacing of responses to the positive stimulus.     

Utilization of global attributions in recognizing and responding to gender discrimination among college women

Although learned helplessness theories suggest that global attributions for gender discrimination may serve to promote feelings of helplessness about responding to discrimination, group consciousness theories suggest they may instead be a precursor to enhancing collective actions against discrimination. To examine this theoretical discrepancy, college women completed measures of attributions for gender discrimination, political consciousness (as measured by common fate), participation in collective action, and helplessness behavior among college women. To examine the unique role of global attributions, participants were included if they made external and unstable attributions for discrimination (N = 231). Structural equation modeling showed that recognizing discrimination occurs globally was associated with an increased sense of common fate, which in turn was related to greater collective action and less helplessness behavior. Theoretical (attributions in an intergroup context) as well as practical (institutional policies on publicizing discrimination) implications were discussed.     

Utilization of global attributions in recognizing and responding to gender discrimination among college women

Although learned helplessness theories suggest that global attributions for gender discrimination may serve to promote feelings of helplessness about responding to discrimination, group consciousness theories suggest they may instead be a precursor to enhancing collective actions against discrimination. To examine this theoretical discrepancy, college women completed measures of attributions for gender discrimination, political consciousness (as measured by common fate), participation in collective action, and helplessness behavior among college women. To examine the unique role of global attributions, participants were included if they made external and unstable attributions for discrimination (N = 231). Structural equation modeling showed that recognizing discrimination occurs globally was associated with an increased sense of common fate, which in turn was related to greater collective action and less helplessness behavior. Theoretical (attributions in an intergroup context) as well as practical (institutional policies on publicizing discrimination) implications were discussed.     

Nicotine vs. ethanol discrimination: Extinction and spontaneous recovery of responding

Studies regarding extinction and spontaneous recovery of the discriminative stimulus effects of drugs are limited. Eight rats were initially trained to discriminate nicotine (0.4 mg/kg) vs. ethanol (800 mg/kg). For four rats, itraperitaneal (IP) administrations of nicotine fifteen minutes prior to fifteen-minute training sessions served as a discriminative stimulus (S^D) for predicting food-reinforced lever pressing (VI-1 min). On other sessions ethanol functioned in predicting nonreinforcement (S^Δ). The stimulus roles of the drugs were counterbalanced for the remaining four rats. S^Δ and S^D sessions alternated quasi-randomly with two daily sessions at 1000 and 1400 hours. Discriminative control was not disrupted following ten extinction sessions under a non-drug/saline condition, but was disrupted following extinction sessions under the original training drugs. Instances of spontaneous recovery (SR) occurred throughout extinction under the drug condtions. There was no evidence for SR two weeks following extinction, but partial recovery four weeks following the final extinction phase. Contextual status (context renewal) had neither a restorative or disruptive impact on extiguished or discriminated responding, respectively. Theser results support and extend the limited number of other studies by demonstrating extinction and spontaneous recovery of responding discriminated bytwo distinct drugs. Some theoretical interpretations regarding history effects and training in the context of drug discrimination are entertained.     

Genetic differences in avoidance learning by Rattus norvegicus: escape/avoidance responding, sensitivity to electric shock, discrimination learning, and open-field behavior

The behaviors of rats selectively bred for either good or poor shuttle box avoidance learning were studied. The results of Experiment 1 indicated that the phenotypic difference in avoidance learning is not associated with differences in speed of escape or avoidance responding. Differences between the lines in frequency of intertrial responses (ITRs), which appear during training but not during pretest, suggest that ITRs in animals of the low-avoidance (SLA) line are more suppressed by electric shock than in animals of the high-avoidance (SHA) line. This result suggests that SLA animals may be more emotionally responsive than SHA animals. Experiment 2 demonstrated that the animals of the two lines do not differ in absolute sensitivity to electric shock, and Experiment 3 showed that the poor performance of the SLA line is not due to an inability to learn. Experiment 3 also provided evidence which suggests that the poor avoidance learning by SLA animals is due to their emotional reactivity. Observations of open-field behavior in Experiment 4 are consistent with this hypothesis. The major consistent correlate of the phenotypic difference in avoidance learning is greater emotionality or emotional reactivity in SLA than in SHA animals.     

African American male adolescents' preferences in responding to racial discrimination: effects of ethnic identity and situational influences

This study investigated male African American adolescents' thinking about responses to racial discrimination. Participants (N=67) were recruited from an urban public high school in southern California. Students completed paper and pencil measures assessing their ethnic identity status and their preferred responses to racial discrimination. African American male adolescents whose scores fell into the unexamined ethnic identity or exploration ethnic identity range more strongly endorsed passive responses than individuals whose scores fell into the achieved ethnic identity range. However, a variety of situational factors moderated participants' responses, including the status of the perpetrator of discrimination and the circumstances in which the discrimination occurred. Results were discussed in terms of the social cognitive variables of self-presentation and perceptions of discrimination.     

Noticing and responding in a discrimination based on a distinguishing element

In learning a successive go/no-go discrimination between a positive display consisting of the elements A and B, and negative display consisting of A-alone, pigeons first trained to peck A shift to pecking the distinguishing B element. In order to learn whether or not the shift to B is facilitated by B's function as a signal of the reinforcer, apart from the direct reinforcement of B responses, six arrangements of the elements with respect to the food reinforcer were used. Discrete trials were terminated by a single peck or after 4 sec. The A and B elements were dots of different color. The most critical comparison was between two groups, both of which received no reinforcement for a response directed to B. In one case, B signaled the reinforcer: An A response was reinforced when B was present but not when A appeared alone. In the other, B signaled the absence of a reinforcer: An A response was nonreinforced when B was present, while the response to A-alone was reinforced. During training and in extinction many more reponses were made to B when it signaled the reinforcer than when it signaled its absence. It is concluded that in a discrimination between AB positive and A negative the shift from pecking A to pecking B is facilitated by B's role as a signal for the reinforcer even on trials in which the peck is not made to B. Results from certain other groups showed that, unless pecks shifted to B within the positive display, pecks to A continued on the negative, A-alone trials as well as on the positive AB trials.     

An experimental study of the correlates and consequences of perceiving oneself to be the target of gender discrimination

An experimental methodology was used to test hypotheses concerning the effects of contextual, cognitive-developmental, and individual difference factors on children’s views of whether they have been the target of gender discrimination and the possible consequent effect of such views on two forms of state self-esteem: performance and social acceptance. Children (N = 108, 5-11 years of age) completed theory of mind and gender attitude measures and a drawing task. Next, children received feedback that was designed to appear either gender biased (discrimination condition) or nonbiased (control condition). Children’s attributions for the feedback and state self-esteem were assessed. As expected, children reported having been the target of gender discrimination more often in the discrimination condition than in the control condition. Older and more cognitively advanced children made fewer attributions to discrimination than their peers. Perceptions of discrimination were associated with higher performance state self-esteem and, among egalitarian children, lower social state self-esteem.     

To Ask or Not to Ask: Enhancing Donations to Nonprofits by Soliciting Opinions Upfront,Rather than Donations

The success of non-profit organizations depends mainly on the strategies they use to recruit new donors. One common strategy is to solicit donations upfront (mostly online)—but is this indeed an effective approach? We conducted three experiments (N_total?=?1287), in which we compared an upfront appeal of that sort with one that offered prospective donors the opportunity to express their opinion about a given fundraising campaign—and then asked if they cared to donate to it. Drawing on foot-in-the-door and escalation of commitment theories, we found that soliciting an opinion (as opposed to a donation) led to greater engagement with the charity among prospective donors, as reflected by their greater willingness to read about the cause. This, in turn, encouraged them to donate. In experiment 1, we showed that the direct effect of request type on donations was mediated by the donors’ willingness to learn about the charity. In experiment 2, we showed that pairing an appeal for an opinion with a donation request was more effective than merely appealing for a donation. Finally, in experiment 3, we found that the more donors learn about a given cause, the stronger their emotional response to it, and the greater their donations to it. Further, we showed that soliciting an opinion (as opposed to a donation) made donors feel a greater connection with the organization. In sum, we propose a simple and cost-effective intervention that may help non-profit businesses become more effective.

     

Emotional and self‐esteem consequences of perceiving discrimination against a new identity group

With a sample of Asian international students, the consequences of perceiving pervasive discrimination against one's in‐group were examined by experimentally manipulating perceived discrimination (pervasive vs rare) and group identification (low vs high). We report evidence that supports and integrates aspects of two contrasted models; namely, the discounting model and the rejection–identification model. Consistent with both models, the effects of perceiving discrimination on one's psychological well‐being depended on the level of group identification. Nevertheless, after reading about pervasive discrimination, low (vs high) identifiers reported less depressed affect, consistent with the discounting model. However, they also reported lower self‐esteem, consistent with the rejection–identification model.     

An analysis of two central stages underlying responding to personality items: The self-referent decision and response selection

A technique for isolating substages in a processing sequence (Sternberg, 1969) was used to examine two central stages in a postulated model of responding to personality items. The Self-Referent Decision (SRD) stage, where item content is compared to stored memory elements, and the Response Selection Stage, where the output of the SRD is mapped into available response alternatives, were analyzed to determine if they could be seen as separate stages. Results indicated that a modular model that viewed these two stages as being separate was supported. These results were also discussed in relation to existing models of item responding processes and the dichotomous/Likert response format issue.     

An analysis of the stages underlying the process of responding to personality items

Three experiments were done to determine the additivity of pairwise comparisons of three personality item characteristics: (1) Length, (2) Ambiguity and (3) Controversiality, using Sternberg's (1969) method. Each of these item attributes was chosen as an experimental factor to represent a stage in a postulated model of responding to personality items. Results indicated non-additivity of the experimental factors which was interpreted as supporting the postulated model.     

Retrieval processes in restructuring: Answer to Keane

In a comment on the attempt by Ohlsson (1984) to interpret the Gestalt theory of restructuring and insight in information processing terms, Keane argues that memory retrieval is central to restructuring and that Ohlsson ignores higher-order memory organizations. Careful comparison between Ohlsson's and Keane's hypotheses about what kind of retrieval occurs in restructuring reveals that they take different stands on three well-known issues in the study of knowledge representation: semantic vs. episodic memory, declarative vs. procedural knowledge, and "small" vs. "large" memory units. Since humans obviously have several types of memory units, both types of retrieval processes may be involved in restructuring.     

Naive optics: Predicting and perceiving reflections in mirrors

Undergraduate students predicted what would be made visible by a planar mirror. A paper-and-pencil task confirmed previous findings that when approaching a mirror from the side, participants expected to see their reflection in the mirror earlier than they actually would. This early response was found for all mirrors when the observer moved horizontally--even when the mirror was placed on the floor or the ceiling--but not when the observer moved vertically (in a lift). The data support the hypothesis that many people imagine the world in the mirror as rotated around the vertical axis. When participants had to judge manipulated mirror reflections according to their naturalness, a high degree of tolerance was found. In contrast to the prediction task, a rotation around the vertical axis was judged to be less natural than other distortions. The authors conclude that perceptual knowledge and predictive knowledge lead to different patterns of errors. ((c) 2003 APA, all rights reserved)