Conflict monitoring and cognitive control

A neglected question regarding cognitive control is how control processes might detect situations calling for their involvement. The authors propose here that the demand for control may be evaluated in part by monitoring for conflicts in information processing. This hypothesis is supported by data concerning the anterior cingulate cortex, a brain area involved in cognitive control, which also appears to respond to the occurrence of conflict. The present article reports two computational modeling studies, serving to articulate the conflict monitoring hypothesis and examine its implications. The first study tests the sufficiency of the hypothesis to account for brain activation data, applying a measure of conflict to existing models of tasks shown to engage the anterior cingulate. The second study implements a feedback loop connecting conflict monitoring to cognitive control, using this to simulate a number of important behavioral phenomena.     

The role of prosody in discourse processing

The influence of prosody and its visual analog, punctuation, in text comprehension was investigated in two experiments. In the first experiment 20 subjects listened to three taped passages of equal length and difficulty varying in intonation (normal, monotonous, or altered) and were tested on tasks of text comprehension and word recognition. In the second experiment 20 new subjects read the same passages but with varying punctuation (appropriate, no punctuation, or altered) and were also tested on text comprehension and word recognition. Subjects' reading time was also recorded. ANOVA results revealed that altered prosody and punctuation affect performance in a similar fashion and seriously impair text comprehension and word recognition. This sensitivity to altered intonation suggests that linguistic prosody not only supplies redundant cues for judging sentence structure but that it also manages attentional resources to help with semantic encoding of lexical units and with the organization of linguistic information in long term memory.     

Mechanisms underlying dependencies of performance on stimulus history in a two-alternative forced-choice task

In choice reaction time tasks, response times and error rates demonstrate differential dependencies on the identities of up to four stimuli preceding the current one. Although the general profile of reaction times and error rates, when plotted against the stimulus histories, may seem idiosyncratic, we show that it can result from simple underlying mechanisms that take account of the occurrence of stimulus repetitions and alternations. Employing a simple connectionist model of a two-alternative forcedchoice task, we explored various combinations of repetition and alternation detection schemes in an attempt to account for empirical results from the literature and from our own studies. We found that certain combinations of the repetition and the alternation schemes provided good fits to the data, suggesting that simple mechanisms may serve to explain the complicated but highly reproducible higher order dependencies of task performance on stimulus history.     

Party over policy: The dominating impact of group influence on political beliefs

Four studies demonstrated both the power of group influence in persuasion and people's blindness to it. Even under conditions of effortful processing, attitudes toward a social policy depended almost exclusively upon the stated position of one's political party. This effect overwhelmed the impact of both the policy's objective content and participants' ideological beliefs (Studies 1-3), and it was driven by a shift in the assumed factual qualities of the policy and in its perceived moral connotations (Study 4). Nevertheless, participants denied having been influenced by their political group, although they believed that other individuals, especially their ideological adversaries, would be so influenced. The underappreciated role of social identity in persuasion is discussed.     

Stability of formal thought disorder and referential communication disturbances in schizophrenia

This study examined the degree to which different types of communication disturbances in the speech of 48 schizophrenia patients and 28 controls were variable and state related versus stable and traitlike. Clinically rated formal thought disorder and 5 types of referential disturbance showed substantial stability within participants over time. The sixth type of referential disturbance, the vague reference, was not stable over time. Formal thought disorder was associated with the severity of core psychotic symptoms in patients. whereas referential disturbances showed little or no association with positive or negative symptom severity. Furthermore, changes in psychotic symptoms over time were accompanied by corresponding changes in formal thought disorder but not referential disturbances. These results support the idea that some types of referential disturbances are traitlike and may be reflective of vulnerability as well as manifest illness.     

When communications collide with recipients' actions: effects of post-message behavior on intentions to follow the message recommendation

Two experiments investigated the processes through which post-message behavior (e.g., noncompliance) influences resistance to the message. Participants in Experiment 1 read preventive, consumer-education messages that either opposed the consumption of an alcohol-like product or recommended moderation. Half of the participants then tried the product, whereas the remaining participants performed a filler task. In the absence of trial, the two messages had the same effect. However, recipients of the abstinence-promoting preventive message who tried the product had stronger intentions to use the product in the future than recipients of the moderation message. This finding suggests that assessments of message impact may be inadequate unless an opportunity for trial is also provided. Results are interpreted in terms of self-perception and cognitive dissonance and contrasted from psychological reactance.     

Signification and Pain: A Semiotic Reading of Fibromyalgia

Patients with persistent pain who lack adetectable underlying disease challenge thetheories supporting much of biomedicalbody-mind discourse. In this context,diagnostic labeling is as inherently vulnerableto the same pitfalls of uncertainty that besetany other interpretative endeavour. The endpoint is often no more than a name ratherthan the discovered essence of a pre-existentmedical condition. In 1990 a Committee of theAmerican College of Rheumatology (ACR)formulated the construct of Fibromyalgia in anattempt to rectify a situation of diagnosticconfusion faced by patients presenting withwidespread pain. It was proposed thatFibromyalgia existed as a ``specific entity',separable from but curiously able to co-existwith any other painful condition. Epistemological and semiotic analyses ofFibromyalgia have failed to find any sign,clinical or linguistic, which coulddifferentiate it from other diffusemusculoskeletal pain states. The construct ofFibromyalgia sought to define a discernablereality outside the play of language and topass it off as a natural phenomenon. However,because it has failed both clinically andsemiotically, the construct also fails the testof medical utility for the subject inpersistent pain.     

Adjustment to divorce: a preliminary study among Muslim Arab citizens of Israel

Adjustment to divorce in a sample of 312 Muslim Arab citizens of Israel was associated both with variables that have been shown to affect adjustment to divorce in Western societies and with variables specific to the culture of the study. The former included male gender, education, current employment, fewer accompanying stressors, and greater satisfaction with the divorce process. The latter were the respondents' self-defined modernity (as opposed to traditionalism) and their disinclination to perceive divorced persons as bad parents and spouses and as socially deviant, in accord with the social stereotype of their community.