Effects of 7.5% CO2-Induced Anxiety on Individual Performance During a Group Computer Combat Game

The inhalation of 7.5% CO₂ has been shown to induce cognitive effects similar to anxiety. Sixteen healthy participants (14 male; mean age 25.6 years) inhaled either a mixture of 7.5% CO₂ gas or air while playing a group combat computer game. Participants reported greater feelings of anxiety and fired fewer bullets when inhaling CO₂ compared with air, indicating CO₂-induced anxiety may improve efficiency without task-related decrements. Being able to induce controlled and measured anxiety in group situations by CO₂ inhalation may be a useful technique when evaluating response to stressful situations, such as combat, in simulators or real-life scenarios.     

Quality of Relationships Between Youth and Community Service Providers: Reliability and Validity of the Trusting Relationship Questionnaire

We examined the factor structure and psychometric properties of the Trusting Relationship Questionnaire, a brief measure of relationship quality between youth and community-based service providers involved in their care. Data on youth residing in Therapeutic Foster Care and in Group Homes (N = 296) were collected. We identified a one-factor solution for the child version of the measure and a two-factor structure for the adult version: child's perception of the relationship and adult's perception of the relationship. Both versions appear to be highly reliable and possess adequate levels of construct, criterion, and discriminative validity. While no statistically significant age differences were noted on the parent version, on the child version, older youth were more likely to report lower relationship scores. Gender differences were found on both versions: Female youth reported higher scores on the child version as did adults reporters of relationships with female youth, but only for the first factor—child's perception of the relationship. Overall, the TRQ appears to capture the quality of the relationship between service providers and youth in their care, thus bridging a gap in assessment measures.     

Psychometric analysis of the Psychopathic Personality Inventory (PPI) with female inmates

This study evaluated the reliability, internal structure, and validity of the Psychopathic Personality Inventory (PPI; Lilienfeld & Andrews, 1996) among female inmates (n = 153) housed at a multilevel prison facility. Findings from this research suggested both strengths and weaknesses associated with PPI psychopathy assessment. Reliability of the PPI was supported by internal consistency analyses of scale and subscale item sets, and test-retest reliability was supported by findings obtained with a subsample (n = 36) retested an average of 49 days after initial test administration. Validity of the PPI total score was also supported by moderate to very high correlations with other self-report measures of psychopathy. Relative weaknesses of the PPI were evident by the low or negative associations among many of the PPI subscales, moderate associations that PPI total scores demonstrated with response set indexes, and the similarity of PPI total scores among female inmates and undergraduates. Findings from this research are considered in relation to possible sex differences in the expression of psychopathy and challenges associated with the assessment of the psychopathy construct with self-report methods.     

Evidence for a visuo-spatial scratch-pad in working memory

Experiments are reported which address the nature of the working memory system. Articulatory suppression (continuous recital of the digits 1 to 4) disrupted concurrent performance of a verbal reasoning task, but had no effect upon performance of a spatial reasoning task. In contrast, spatial suppression (continuous sequential tapping) produced reliable interference only with spatial reasoning. These findings are taken as consistent with Baddeley's argument for two slave systems in working memory: the articulatory loop and the more controversial visuo-spatial scratch-pad.     

Comparison for aphasic and control subjects of eye movements hypothesized in neurolinguistic programming

Neurolinguistic programming's hypothesized eye movements were measured independently using videotapes of 10 nonfluent aphasic and 10 control subjects matched for age and sex. Chi-squared analysis indicated that eye-position responses were significantly different for the groups. Although earlier research has not supported the hypothesized eye positions for normal subjects, the present findings support the contention that eye-position responses may differ between neurologically normal and aphasic individuals.     

Dyslexia and a temporal processing deficit: A reply to the commentaries

A number of points and criticisms were raised in the commentaries on our review paper (Farmer & Klein, 1995), and in this reply we address the most pertinent and major of those points. First, we clarify and expand upon what we mean by a temporal processing deficit. We then address Studdert-Kennedy and Mody’s (1995) major claims, which are confined to the auditory modality, that (1) a discriminative deficit underlies what they see as a rate of processing deficit, and (2) discriminative/rate deficits for speech and nonspeech materials are independent. We explain why we believe the first proposal is unlikely to provide an explanation of the temporal processing deficits that we reviewed, and we present a simple framework within which speech and nonspeech perceptual codes are viewed as higher level isolable subsystems that depend on a common, lower level, auditory input system. The speech and nonspeech systems may be influenced similarly by damage to, or impairments of, their common input system, but they can be selectively influenced by insults after the pathways diverge. Then we address some of the issues raised by Rayner, Pollatsek, and Bilsky (1995), relating to visual deficits and oculomotor behavior, and we point to the rapidly growing evidence to diminish skepticism about the occurrence of a transient system deficit in dyslexia. Next, while agreeing that case studies are valuable, we dispute Martin’s (1995) endorsement of the case study as the preferred methodology for studying a heterogeneous deficit such as developmental dyslexia. Finally, we affirm our original conclusion that more research aimed at revealing the nature and generality of the visual and auditory temporal processing deficits is warranted, and we reiterate some of our suggestions for the types of study that might help elucidate if and how these deficits might be causally related to the dyslexia with which they are frequently associated.     

Behavioral assessment of personality disorders

This article examines the definition of personality disorders (PDs) from a functional analytical framework and discusses the potential utility of such a framework to account for behavioral tendencies associated with PD pathology. Also reviewed are specific behavioral assessment methods that can be employed in the assessment of PDs, and how information derived from these assessments may be linked to specific intervention strategies.     

Insurance Coverage and Mental Health Service Use by Adolescents with Serious Emotional Disturbance

This paper examines the relationships between insurance coverage, need, and mental health services in a community-based sample of 1,015 youths who were 9, 11, and 13 years old at the beginning of the study. They were followed over a two-year period. A strong measure of need based on a standardized diagnostic interview was available and repeated over three annual waves. Data on service use was collected quarterly across two years. Major findings included: (a) high need (serious emotional disturbance [SED]) was strongly related to use of any mental health services; (b) services use was much more likely to occur with public (Medicaid) insurance coverage than either private or no insurance; (c) considerable unmet need was observed even for youths with SED; (d) school-based mental health services potentially substituted for professional mental health services; and (e) there was little unnecessary use of mental health services in the low need group. The major policy implication of these findings is that the regulation of insurance benefits should be based on level of need, rather than on arbitrary limits which are likely to either reduce the probability of or appropriate amount of care for youths who most need mental health services.