An investigation of the gate control theory of pain using the experimental pain stimulus of potassium iontophoresis

This study investigated a prediction derived from gate control theory—that there would be a pulse of pain as a pain stimulus was being ramped off due to the rapidly transmitting, inhibitory large fiber activity falling away sooner at the spinal level than the excitatory activity of the slow-transmitting, small nociceptive afferents. A further prediction was that the more distant the peripheral stimulus was from the spine, the greater the pain pulse would be. Fourteen subjects had the pain stimulus of iontophoretically applied potassium ions (K⁺) applied to an upper and a lower site on the dominant arm. In a threshold detection task using the double random staircase method, subjects were asked to indicate whether they could detect a pulse of additional pain during this ramp-off phase. The average rate of stimulus ramp-off in order to detect a pain pulse was statistically greater for the upper-arm site (14.3 μg K⁺/sec) than for the lower-arm site (9.4 μg K⁺/sec). These results were consistent with gate control theory. Alternative explanations, including intrinsic differences in nociceptive responding for different dermatomes and anode break, were considered. It was concluded that the detection of a pain pulse during the ramping off of a peripheral pain stimulus potentially provides a quantitative measure of the spinal modulation of pain.     

Complementarity in relationships of couples affected by HIV

Psychological interventions with patients with HIV infection may affect the stability of the patient's relationship with others. Two clinical cases are described to illustrate this. Both the impact of AIDS on patients and their relationships, and the impact of psychological interventions on the index patient and others, should always be considered when HIV-infected patients are referred to psychiatrists and other mental health care workers.     

Sentential synonymity judgment

Despite the acknowledged theoretical importance of sentential synonymity, there has been little interest in the psychological mechanisms responsible for recognizing it. Here an attempt is made to explore ways in which specific models originally devised for other particular psycholinguistic tasks (e.g., sentence-picture verification, three-term series problems, syllogistic reasoning) can be generalized to synonymity judgment and ways in which recent psychosemantic theories can be made more specific to deal with this same paradigm. Differential predictions from these models are derived for a set of spatiotemporal bidimensional comparative synonym pairs (e.g., High before Low, First above Second), and an experiment to test these predictions is reported. It is argued that, although the results are consonant with predictions from one type of model, they do not favor it definitively. This is because models of this type do not detail how bidimensional comparatives can be parsed into the same propositional representation and because other models can be subjected to further post hoc modifications to account for the data. Finally, general problems arising from attempts to adapt existing models to new tasks are discussed.     

Can the Discretionary Nature of Certain Criteria Lead to Differential Prediction Across Cultural Groups?

We examined the conjecture that relations between constructs across cultures may be susceptible to cultural moderation where the performance of the criterion construct is discretionary. This hypothesis was investigated using the relationship between personality and three performance constructs, with samples from the United States and New Zealand, two ideologically distinct cultures with respect to achievement orientation. All hypotheses were supported by results of hierarchical moderated regression analyses using bias free measures, suggesting that considering whether construct behaviors are discretionary is important when considering the merit of generalizing research findings across cultures.     

Production benefits both recollection and familiarity

In three experiments, we investigated the roles of recollection and familiarity in the production effect—the finding that words read aloud are remembered better than words read silently. Experiment 1, using the remember/know procedure, and Experiment 2, using the receiver operating characteristic procedure, converged in demonstrating that production enhanced both recollection and familiarity. Experiment 3 supported the role of recollection by demonstrating that specific episodic information—that is, whether a word had been studied aloud or silently—was stronger for items studied aloud. These findings fit with an explanation of the production effect as hinging on two factors: greater recollection of distinctive information from the study episode, and more familiarity due to greater attention allocated to the material studied aloud.     

Avoidance of eye gaze by adults who stutter

PurposeAdults who stutter are at significant risk of developing social phobia. Cognitive theorists argue that a critical factor maintaining social anxiety is avoidance of social information. This avoidance may impair access to positive feedback from social encounters that could disconfirm fears and negative beliefs. Adults who stutter are known to engage in avoidance behaviours, and may neglect positive social information. This study investigated the gaze behaviour of adults who stutter whilst giving a speech.Method16 adults who stutter and 16 matched controls delivered a 3-min speech to a television display of a pre-recorded lecture theatre audience. Participants were told the audience was watching them live from another room. Audience members were trained to display positive, negative and neutral expressions. Participant eye movement was recorded with an eye-tracker.ResultsThere was a significant difference between the stuttering and control participants for fixation duration and fixation count towards an audience display. In particular, the stuttering participants, compared to controls, looked for shorter time at positive audience members than at negative and neutral audience members and the background.ConclusionsAdults who stutter may neglect positive social cues within social situations that could serve to disconfirm negative beliefs and fears.Educational objectives: The reader will be able to: (a) describe the nature of anxiety experienced by adults who stutter; (b) identify the most common anxiety condition among adults who stutter; (c) understand how information processing biases and the use of safety behaviours contribute to the maintenance of social anxiety; (d) describe how avoiding social information may contribute to the maintenance of social anxiety in people who stutter; and (e) describe the clinical implications of avoidance of social information in people who stutter.     

Prepared for the best: readiness to modify attentional processing and reduction in anxiety vulnerability in response to therapy

Individuals differ in the extent to which their vulnerability to anxiety is reduced by psychological therapy. However, the cognitive basis for such individual differences is still poorly understood. To test a cognitive account of differences in anxiety reduction in response to treatment, the present study examined individuals undergoing group therapy for social anxiety disorder. We assessed whether differences in their readiness to adopt selective attentional processing in response to an experimental contingency predicted positive changes in a range of anxiety measures in response to treatment. Findings were consistent with the position that readiness to alter attentional processing bias may underpin individual differences in the tendency to respond to positive experiential conditions, such as group therapy, by reducing anxiety vulnerability.     

Predictors of complicated grief

Abstract

This study examined whether process variables predict an outcome of complicated grief. A turbulent and prolonged grief was predicted to occur after the death of a spouse in subjects who had self-blame, used the deceased for an extension of self, had ambivalence toward the deceased, or overcontrolled emotional responses. Ninety subjects were examined at 6, 14, and 25 months after the loss via a self-report battery of process variables and a structured clinical interview designed to assess symptoms. Subjects with complicated grief were compared with those with normative grief. Predictions were supported only in tertiary data analyses; they were not supported well in the primary and secondary statistical analyses. The authors concluded that either self-reports of process variables are inadequate measures or the theory that led to these measures and predictions is in need of revision.     

Nonsense on Stilts? Wittgenstein,Ethics, and the Lives of Animals

Wittgenstein is often invoked in philosophical disputes over the ethical justifiability of our treatment of animals. Many protagonists believe that Wittgenstein's philosophy points to a quantum difference between human and animal nature that arises out of humans' linguistic capacity. For this reason – its alleged anthropocentrism – animal liberationists tend to dismiss Wittgenstein's philosophy, whereas, for the same reason, anti‐liberationists tend to embrace it. I endorse liberationist moral claims, but think that many on both sides of the dispute fail to grasp the import of Wittgenstein's philosophy. My argument proceeds through close engagement with Michael Leahy's Against Liberation, which makes extensive use of Wittgenstein's ‘notion of language‐games’ as an ‘essential methodological aid’ in its defence and justification of the moral status quo. Leahy's understanding and application of that method exemplifies an entrenched interpretative stance in the wider Wittgensteinian scholarship which I seek to counter. This enables me to show that far from entailing conservatism, as some of his critics and followers contend, Wittgenstein's philosophical method is just as conducive to radical moral and political critique as it is to any other normative position.     

Rich Egalitarianism,Ordinary Politics,and the Demands of Justice

In this paper I develop a theory of the physical realization of higher-level properties. I argue that physical realization is in an important sense indirect, and that at each level causal relations are crucial to realizing next-level phenomena. My account makes it intelligible how higher-level properties can be realized by wide stretches of physical reality without the inter-level dependence becoming weak, or global; it also explains how both physicalism and non-reductivism can be true.