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Biomedical subjects

P Muris

Publications and source records attributed to P Muris.

At least 73 records · Page 4Linked to original sources
PubMed1997

Spider phobia in children: disgust and fear before and after treatment.

Fear of spiders, disgust sensitivity, and spiders' disgust-evoking status were assessed in a group of spider phobic girls (n = 22) who applied for treatment, in a group of non-phobic girls (n = 21), and in the parents of both groups of children. The phobic girls were tested both before and after behavioural treatment which consisted of 1.5 hr eye movement desensitization and reprocessing and 1.5 hr exposure in vivo. Findings support the idea that disgust is an important aspect of spider phobia: (a) spider phobic girls exhibited higher levels of disgust sensitivity and considered spiders per se as more disgusting than non-phobic girls; (b) there was a parallel decline of spider fear and spiders' disgust-evoking status as a result of treatment; and (c) spiders' disgust-evoking status was relatively strong in mothers of spider phobic girls. The latter finding may indicate, that the acquisition of spider fear is facilitated by specific parental disgust reactions when confronted with spiders.

Adolescent↗
PubMed1997

Thought suppression in spider phobia.

The current study examined the role of thought suppression in spider phobia. Spider phobic (n = 41) and non-phobic (n = 40) subjects were asked to monitor their thoughts for three 5 min periods. During the first period, all subjects were instructed to "think about anything". During the second period, half of the subjects received suppression instructions (i.e., subjects were explicitly asked "not to think of spiders"), whereas the other half once again received instructions to "think about anything". During the third period, all subjects were instructed to "think about anything". Spider-related thoughts were monitored on-line. Also, subjects retrospectively estimated the amount of time they had spent thinking about spiders. Overall, spider phobics reported higher levels of spider-related thoughts than non-phobic subjects. Furthermore, phobic subjects tried harder to suppress spider-related thoughts than non-phobic subjects. Finally, although some evidence was found for the counterproductive effects of thought suppression, its contribution to the frequency of spider-related thoughts was minimal.

Adult↗
PubMed1997

Common childhood fears and their origins.

The present study examined rank orders and characteristics of childhood fears. A 'free option' approach ('What do you fear most?') deviated markedly from the fear rank order based on the Fear Survey Schedule for Children. A second aim of the study was to investigate the origins of prevalent childhood fears. In contrast to the results of Ollendick and King (1991, Behaviour Research and Therapy, 29, 117-123), conditioning was found to be the most commonly reported pathway related to exacerbation and onset of fears. Finally, special attention was given to the top intense fear in children, namely fear of spiders. Children who reported 'none', 'some' or 'a lot' of spider fear were compared with each other in terms of pathways. No differences between the three groups were found with respect to the frequency of modeling and information experiences. However, high fearful children more often reported conditioning experiences than low or moderate fearful children.

Adolescent↗
PubMed1997

The etiology of childhood spider phobia.

Twenty-six girls with a clinical spider phobia and 26 matched control girls were interviewed about conditioning, modeling, and negative information experiences in connection with spiders. In addition, parents of the phobic girls were independently interviewed about the origins of their child's phobia. Phobic children more often reported aversive conditioning experiences with spiders than did control children. Also, in a number of cases, conditioning events described by the phobic children were confirmed by their parents, a result that replicates the findings of Merckelbach, Muris and Schouten (1996; Behaviour Research and Therapy, 34, 935-938). Taken together, the results contradict a strong version of the non-associative account of phobias and suggest that in at least some cases, conditioning events may contribute to the development of (childhood) spider phobia.

Adolescent↗
PubMed1997

Effects of thought suppression on episodic memory.

Subjects were shown a short film fragment. Following this, one group of subjects (n = 26) was instructed to suppress their thoughts about the film, while the other group (n = 24) received no instructions. After 5 hrs subjects returned to the laboratory and completed a questionnaire testing their memory about the film. Results showed that suppression subjects reported a higher frequency of thoughts about the film than control subjects. No evidence was obtained for Wegner, Quillian, and Houston's (1996; Journal of Personality and Social Psychology, 71, 680-691) claim that suppression has an undermining effect on memory for chronology. Possible causes for the differences between the results as obtained by Wegner et al., and those found in the present study are discussed. These causes may pertain to the experimental design, but also to differences in emotional impact of the stimulus material that was used in both studies.

Adolescent↗
PubMed1997

Eye movement desensitisation and reprocessing versus exposure in vivo. A single-session crossover study of spider-phobic children.

BACKGROUND: Eye movement desensitisation and reprocessing (EMDR) is a relatively new therapeutic technique that has been proposed as a treatment for post-traumatic stress disorder and other anxiety complaints. METHOD: We compared the efficacy of EMDR with that of exposure in vivo in the treatment of a specific phobia. Twenty-two spider-phobic children who met the DSM-III-R criteria for specific phobia participated in the study. Children were treated with one session of exposure in vivo and one session of EMDR in a crossover design. Treatment outcome was evaluated by self-report measures, a behavioural avoidance test and a physiological index (skin conductance level). RESULTS: Results showed positive effects of EMDR, but also suggest that it is especially self-report measures that are sensitive to EMDR. Improvement on a behavioural measure was less pronounced, and exposure in vivo was found to be superior in reducing avoidance behaviour. With regard to skin conductance level, EMDR and exposure in vivo did not differ. CONCLUSIONS: EMDR has no additional value in treatment of this type of animal phobia, for which exposure in vivo is the treatment of choice.

Adolescent↗
PubMed1996

UCS inflation and human aversive autonomic conditioning.

Fifty students participated in a differential conditioning paradigm. In the first part of the experiment, one neutral slide (CS+) was paired with a tone (UCS) and another neutral slide (CS-) was never followed by a tone. During the subsequent inflation phase, unsignalled UCSs gradually increased in strength for the inflation group while they were kept constant for the control group. During extinction trials, the inflation group initially showed relatively stronger UCS expectancies on the CS+ trials than the control group. In contrast to what was predicted, the UCS inflation procedure did not result in stronger conditioning effects of the skin conductance response compared to the control procedure. The effectiveness of the UCS inflation procedure was not related to trait anxiety.

Acoustic Stimulation↗
PubMed1996

The role of parental fearfulness and modeling in children's fear.

The present study investigated the contribution of parental modeling to the fearfulness of children. Forty children (aged 9-12) who were referred to an outpatient treatment centre filled out the trait version of the Spielberger State-Trait Anxiety Inventory for Children (STAIC) and the revised version of the Fear Survey Schedule for Children (FSSC). The parents of the children completed adult versions of the STAI-trait and the FSS. In addition, parents rated to what extent they generally expressed fears to their children. Results showed that trait anxiety in children was positively associated with trait anxiety of both the mother (r = 0.34, P < 0.05) and the father (r = 0.31, P < 0.05). Fearfulness of the children was only related to fearfulness of the mother (r = 0.56, P < 0.001). Most importantly, the data showed that modeling played a role in this relationship. A linear association between FSSC scores and mothers' rating of expressing fears to their children was found. That is to say, children of mothers who never expressed their fears had the lowest FSSC scores, children of mothers who often expressed their fears had the highest FSSC scores, whereas children of mothers who sometimes expressed their fears scored in between.

Anxiety Disorders↗
PubMed1996

Spider phobia questionnaire for children (SPQ-C): a psychometric study and normative data.

The purpose of this study was to develop a reliable and valid questionnaire to assess spider fear in children. The Spider Phobia Questionnaire for adults was adapted for children by simplifying items and by assessing situations relevant to children. The SPQ for children (SPQ-C) was administered to two non-clinical samples of children aged 8-12. The first sample consisted of 586 Ss who filled in the SPQ-C twice, with a retest interval of 6-7 weeks. Internal consistency and test-retest reliability were high. The second sample consisted of 669 children of which 28 spider phobic and 30 nonphobic girls were selected for the Behavioural Approach Test (BAT). The SPQ-C predicted BAT scores, thus supporting the validity of the questionnaire as a measure of spider fear. Norms for the SPQ-C, based on the total sample of children, are provided.

Animals↗
PubMed1996

Psychometric evaluation of the Dutch version of the Aggression Questionnaire.

Confirmatory factor analyses were done in an attempt to replicate the factor structure of the Aggression Questionnaire constructed by Buss and Perry (1992) [Journal of Personality and Social Psychology, 63, 452-459] in a Dutch sample. The findings indicated that the Buss and Perry 4-factor model provided a poor fit to the full 29-item questionnaire. Although generally confirming the 4-factor structure, subsequent analyses revealed that a better fit was obtained by omitting 3 items (1 Verbal Aggression and 2 Hostility items). In general, the present findings are rather similar to previous research and emphasize the importance of assessing not only overall aggression but also its separate components.

Adolescent↗
PubMed1996

Dimensions of hostility and myocardial infarction in adult males.

The present case-control study investigated the association between dimensions of hostility and myocardial infarction (MI) in adult males. Hostility was measured with the Buss-Durkee Hostility Inventory (BDHI), which assesses two distinct dimensions of hostility, namely experiential and expressive hostility. Cases were 81 males who were admitted in hospital because of a first MI. The reference group consisted of 168 age-matched, healthy male neighbourhood controls. Analyses revealed that especially experiential hostility (comprised of the subscales Resentment and Suspicion) was significantly associated with MI. These results are in contrast with the findings of previous studies, which showed expressive hostility to be positively related to coronary heart disease (CHD). Explanations for these contradictory findings are discussed.

Adult↗
PubMed1996

A comparison of two spider fear questionnaires.

The present studies compared the psychometric properties of two self-report measures of spider fear: Fear of Spiders Questionnaire (FSQ) and Spider Phobia Questionnaire (SPQ). In the first study, adequate test-retest stability and internal consistency was found for both FSQ and SPQ. In the second study, both instruments were able to differentiate between phobic and non-phobic subjects. Furthermore, FSQ as well as SPQ were sensitive to therapeutic change and correlated in a meaningful way with other subjective and behavioral indices of spider fear. Data suggest that the FSQ is superior to the SPQ in measuring fear in the non-phobic range. Also, the FSQ taps a somewhat different aspect of subjective spider fear (i.e., fear of harm) and, consequently, may provide additional information.

Adolescent↗
PubMed1996

Defence style and behaviour therapy outcome in a specific phobia.

The Defense Style Questionnaire (DSQ) was administered to patients with a specific phobia (animal type; N = 54) and to control subjects (N = 29). Results indicated that specific phobia patients and non-phobic control subjects exhibit a similar pattern of defences. Also, the study investigated whether specific DSQ defence styles affect behaviour therapy outcome. It was found that an immature defence style, and especially the defence mechanism projection, was related to less favourable treatment results.

Adolescent↗
PubMed1995

Exposure therapy outcome in spider phobics: effects of monitoring and blunting coping styles.

The present study examined whether monitoring (i.e. seeking out threat-related information) and blunting (i.e., avoiding threat-related information) coping styles affect therapy outcome. The sample consisted of 36 spider phobics who underwent one 2.5 hr session of exposure in vivo. Monitoring and blunting were assessed with the Miller Behavioural Style Scale (MBSS) at two points in time: before and after (i.e. at 2 years follow-up) treatment. It was found that coping styles did not change dramatically over a 2-year period. Furthermore, pre-treatment and follow-up coping style scores essentially produced the same results: monitoring was associated with less favourable therapy outcome, whereas blunting was related to better treatment results.

Adaptation, Psychological↗
PubMed1995

Negative cognitions of dental phobics: reliability and validity of the dental cognitions questionnaire.

This study investigated the psychometric properties of the Dental Cognitions Questionnaire (DCQ). This measure contains 38 items and assesses both frequency and believability of negative cognitions related to dental treatment. The results indicated that the DCQ has good internal consistency, high test-retest reliability, and satisfactory concurrent validity, as indicated by positive associations with indices of anxiety and other cognitive measures (n = 180). Factor analysis revealed a one factor solution. Furthermore, the DCQ discriminated strongly between dental phobics (n = 85) and non-phobic Ss (n = 70). Moreover, it was found that combinations of DCQ items have substantially more explanatory power than did a measure of dental trait anxiety, explaining up to 70.7% of the variance in state anxiety ratings in the dental situation. Overall, it appears that dental phobics have many extremely negative beliefs and self-statements about themselves and about what might happen during treatment. Since certain cognitions seem to play a critical role in fear evocation, diminishing catastrophizing ideation may be an important determinant of adjustment to dental treatment and reduction of psychological distress.

Adolescent↗