The effects of anxiety on intellectual performance: When and why are they found?

An experiment tested the effects on intelligence and creativity test performance of two 16PF primary anxiety traits, and general mood and activation components of state anxiety. Two attentional theories of the deleterious effects of anxiety on performance were also tested. Subjects were 80 male students. Trait and state components of anxiety appeared to affect creativity test performance independently. Intelligence test performance was insensitive to anxiety variables. The O anxiety primary factor was significantly negatively correlated with creativity test performance, but the unique variance of the other anxiety primary (Q4) was associated with higher levels of performance. Neither specific attentional theory was supported, but data were generally compatible with “dual-mechanism” theories of anxiety, which posit separate detrimental and sometimes facilitative effects of anxiety on performance.     

Conduct disorder and personality

A sample of children with a diagnosis of conduct disorder and a sample of children from a London comprehensive school were investigated. Three questionnaires were administered to assess personality, impulsiveness and anxiety. Of the personality measures contained within the Junior Eysenck Personality Questionnaire only Psychoticism was found to significantly differentiate the conduct disorder and normal control samples. The Impulsiveness scale of the I₆ also differentiated the two samples. There were no significant differences between the two samples in their scores on the anxiety scale of the “What I Think and Feel”. The findings are discussed in relation to theories of personality proposed by Eysenck and Eysenck (1969), Gray (1987) and Quay (1988).     

Impulsiveness and anxiety: Information processing and electroencephalograph topography

Within a general systems model of personality, we are currently studying impulsiveness and other personality traits using multitrait-multimethod multivariate designs. The research involves a wide spectrum of techniques in an effort to find consistent relationships among biological, cognitive, behavioral, and environmental correlates of the personality traits. The goal is to develop unique profiles of personality traits based on these four classes of measurements. Our research has demonstrated that impulsiveness and anxiety are personality traits that have loadings on two orthogonal higher order personality factors that we have labeled action-oriented and mood-feeling. From both an empirical research and a clinical viewpoint, we have identified three subtraits of impulsiveness: cognitive (Ic), motor (Im), and nonplanning (Inp). Inp is hypothesized to relate to frontal lobe brain processes, while Ic and Im are more related to neural mechanisms that (1) control performance on tasks with “timing-and-rhythm” demands and/or (2) are related to seizure disorders. High-impulsive subjects (especially when high on Ic and Im) are less efficient at performing a wide range of psychomotor tasks. We hypothesize that this inefficiency relates to the information-gating properties of the nervous system being out of “synch” with efficient performance of selected tasks. High-impulsive subjects are visual N100 event-related potential augmentors, which would be consistent with this dyssynchrony occurring in the early stages of information processing. We also hypothesize that impulsiveness is related to serotonin (high impulsiveness related to low serotonin levels). Our psychopharmacological-psychophysiological studies of information processing would be consistent with the latter hypothesis.     

The relationship between child-report, parent self-report, and partner report of perceived parental rearing behaviors and anxiety in children and parents

This study investigated the relationship between child anxiety, parental anxiety, and perceived current parental rearing practices, using a multiple informants approach, that is, by aggregating the perception of the child, parent and partner on parental rearing behaviors. Unselected children aged 9–12 (n=75) and both their biological parents filled in the SCARED-C to measure child anxiety, and parents completed the SCARED-A to measure parental anxiety. In addition, child report, parental self-report, and partner report of the rearing dimensions “autonomy-encouragement versus overprotection”, “acceptance versus rejection”, and “psychological control” of both parents was assessed. Results showed that the homogeneity of some rearing dimensions using a single informant was insufficient, but sufficient when using multiple informants. Inter-informant agreement was low (M=0.29). Three-informants' aggregates yielded good generalizability (M=0.54), and the generalizability of six-informants' aggregates (combining both parents) was impressive (M=0.76). Using multiple informants, parental autonomy granting versus overprotection was substantially related to child anxiety (r=−0.41, p<0.001), as well as to parental anxiety (r=−0.45, p<0.001). More precisely, paternal autonomy–overprotection was predominantly related to child anxiety, whereas maternal autonomy–overprotection was predominantly related to maternal anxiety. Acceptance versus rejection and psychological control were only modestly related to child and parental anxiety.     

Trait anxiety, defensiveness and selective processing of threat: an investigation using two measures of attentional bias

Attentional biases for threat were examined in a non-clinical sample (N=60), with each participant tested on both the modified Stroop colour-naming and dot probe tasks. Three groups were selected on the basis of trait anxiety and social desirability scale (SDS) scores: “low anxiety” (LA: low trait, low SDS), “repressor” (REP: low trait, high SDS) and “high anxiety” (HA: high trait, low SDS). Results from the colour-naming task suggested that high levels of defensiveness (in combination with low trait anxiety) were associated with greater avoidance of threat. The REP group showed less interference in colour-naming threat than neutral words; whereas the HA group showed increased interference due to threat words. On the dot probe task, there was a general tendency for this non-clinical sample as a whole to show avoidance of social threat relative to neutral words, but there was no bias for physical threat words. Avoidance of social threat was significant only within the REP group. No relationships were found between the measures of cognitive bias from the two tasks, suggesting different underlying mechanisms. Results are discussed in relation to previous findings and theoretical views of the effects of anxiety and defensiveness on the processing of threat.     

Speech-associated gestures, Broca’s area, and the human mirror system

Speech-associated gestures are hand and arm movements that not only convey semantic information to listeners but are themselves actions. Broca’s area has been assumed to play an important role both in semantic retrieval or selection (as part of a language comprehension system) and in action recognition (as part of a “mirror” or “observation–execution matching” system). We asked whether the role that Broca’s area plays in processing speech-associated gestures is consistent with the semantic retrieval/selection account (predicting relatively weak interactions between Broca’s area and other cortical areas because the meaningful information that speech-associated gestures convey reduces semantic ambiguity and thus reduces the need for semantic retrieval/selection) or the action recognition account (predicting strong interactions between Broca’s area and other cortical areas because speech-associated gestures are goal-direct actions that are “mirrored”). We compared the functional connectivity of Broca’s area with other cortical areas when participants listened to stories while watching meaningful speech-associated gestures, speech-irrelevant self-grooming hand movements, or no hand movements. A network analysis of neuroimaging data showed that interactions involving Broca’s area and other cortical areas were weakest when spoken language was accompanied by meaningful speech-associated gestures, and strongest when spoken language was accompanied by self-grooming hand movements or by no hand movements at all. Results are discussed with respect to the role that the human mirror system plays in processing speech-associated movements.     

Media images of the "ideal" female body: can acute exercise moderate their psychological impact?

Exposure to the media's “ideal” physique increases mood and body image disturbance, especially for at-risk women. Because exercise decreases mood and body image disturbance, we examined the ability of acute aerobic exercise to moderate the negative psychological impact of exposure to media pictures of the “ideal” female body. Women reporting high drive for thinness and media internalization viewed pictures of either nonphysique or “ideal” physique pictures after engaging in 30 min of either aerobic exercise or quiet rest. Compared to the nonphysique pictures, viewing the physique pictures resulted in increased depression and body dissatisfaction. Acute aerobic exercise, however, did not moderate the negative mood states elicited by the media images. Implications of our results and future directions for research are discussed.     

Sheldon's physical-psychical typology revisited

In order to clarify some of the general findings in the literature with respect to relationships between body type and the personality dimension extraversion/introversion, typical experimental paradigms common to this field were replicated but using the first-order factors (from the R. B. Cattell, H. W. Eber, & M. M. Tatsuoka (1970, Handbook for the sixteen personality factor questionnaire, Windsor: N.F.E.R.) analysis) that load on this continuum rather than the continuum itself. Use was made of standard statistical procedures as well as discriminant analysis. The most noteworthy finding was that subjects were able to utilize the first-order factor structure for the continuum extraversion/introversion in a discriminating manner and to assign such factors in a fairly clear-cut way to three extreme body types. Personality appraisals of the mesomorphic body type and an ideal type (composed by the subjects) were shown to be virtually identical. The most positive extravert characteristics were assigned to the endomorph body build and the most positive introvert characteristics to the ectomorph. No differences in personality appraisals by male (n = 50) and female (n = 50) subjects with the exception of factor Q₂ by the ectomorphic body type were found. Both male and female subjects showed a preference for the (male) mesomorphic body type although significant differences between male and female subjects in the pattern of their distribution of preferences over the three body types were found. While the results confirm previous findings, they also extend them by the use of a first-order factor structure for the continuum extraversion/introversion and by the introduction of the explanatory concepts “extravert of affect” and “extravert of action.”     

Heart rate variability and respiratory concomitants of visual and nonvisual “imagery” and cognitive style

Attention to visual and nonvisual imagery, elicited by an imagery questionnaire, was studied using both within and between subjects analyses of cardiac and respiratory parameters. Visual imagery was accompanied by more regular interbeat heart rate (HR) and shorter, more stable respiratory cycles than nonvisual imagery. “Visually-oriented” thinkers (visualizers), identified by a word association test, manifested less overall variability in HR than “verbally-oriented” thinkers (verbalizers), as well as less variable HR and respiratory period during visual imagery. Visual and nonvisual imagery differed in HR variability for verbalizers and in respiration period for visualizers. The results are discussed in terms of the concepts of attention deployment, “mental load”, cerebral asymmetry, and stylistic personality differences in cognitive functioning.     

Predicting the Early Developmental Course of Symptoms of Attention Deficit Hyperactivity Disorder

Data from the National Institute of Child Health and Human Development Study of Early Child Care were examined to test whether: attention deficit/hyperactivity disorder (ADHD) symptoms remain stable from 54 months through early elementary school; behavioral inhibition and attention deficits assessed at 54 months predict ADHD symptoms in elementary school, even after controlling for their temporal stability; and early behavioral inhibition and attention deficits moderate the longitudinal stability in ADHD symptoms. Data were examined using continuous and categorical measures of symptoms. Modest stability in ADHD symptoms from 54 months to third grade was found. Measures of inhibition and inattention predicted later teacher ratings uniquely, but no evidence was found for moderation. Measures of preschool behavioral inhibition also predicted “persistently at risk status” defined by elevated teacher ratings over time. Results are discussed in terms of executive and motivational facets of inhibition that may be related to early signs of ADHD.     

Contrast of hand preferences between communicative gestures and non-communicative actions in baboons: Implications for the origins of hemispheric specialization for language

Gestural communication is a modality considered in the literature as a candidate for determining the ancestral prerequisites of the emergence of human language. As reported in captive chimpanzees and human children, a study in captive baboons revealed that a communicative gesture elicits stronger degree of right-hand bias than non-communicative actions. It remains unclear if it is the communicative nature of this manual behavior which induces such patterns of handedness. In the present study, we have measured hand use for two uninvestigated behaviors in a group of captive olive baboons: (1) a non-communicative self-touching behavior (“muzzle wipe” serving as a control behavior), (2) another communicative gesture (a ritualized “food beg”) different from the one previously studied in the literature (a species-specific threat gesture, namely “hand slap”) in the same population of baboons. The hand preferences for the “food beg” gestures revealed a trend toward right-handedness and significantly correlated with the hand preferences previously reported in the hand slap gesture within the same baboons. By contrast, the hand preferences for the self-touching behaviors did not reveal any trend of manual bias at a group-level nor correlation with the hand preferences of any communicative gestures. These findings provide additional support to the hypothesized existence in baboons of a specific communicative system involved in the production of communicative gestures that may tend to a left-hemispheric dominance and that may differ from the system involved in purely motor functions. The hypothetical implications of these collective results are discussed within the theoretical framework about the origins of hemispheric specialization for human language.     

Dual language use in sign-speech bimodal bilinguals: fNIRS brain-imaging evidence

The brain basis of bilinguals’ ability to use two languages at the same time has been a hotly debated topic. On the one hand, behavioral research has suggested that bilingual dual language use involves complex and highly principled linguistic processes. On the other hand, brain-imaging research has revealed that bilingual language switching involves neural activations in brain areas dedicated to general executive functions not specific to language processing, such as general task maintenance. Here we address the involvement of language-specific versus cognitive-general brain mechanisms for bilingual language processing. We study a unique population, bimodal bilinguals proficient in signed and spoken languages, and we use an innovative brain-imaging technology, functional Near-Infrared Spectroscopy (fNIRS; Hitachi ETG-4000). Like fMRI, the fNIRS technology measures hemodynamic change, but it is also advanced in permitting movement for unconstrained speech and sign production. Participant groups included (i) hearing ASL–English bilinguals, (ii) ASL monolinguals, and (iii) English monolinguals. Imaging tasks included picture naming in “Monolingual mode” (using one language at a time) and in “Bilingual mode” (using both languages either simultaneously or in rapid alternation). Behavioral results revealed that accuracy was similar among groups and conditions. By contrast, neuroimaging results revealed that bilinguals in Bilingual mode showed greater signal intensity within posterior temporal regions (“Wernicke’s area”) than in Monolingual mode. Significance: Bilinguals’ ability to use two languages effortlessly and without confusion involves the use of language-specific posterior temporal brain regions. This research with both fNIRS and bimodal bilinguals sheds new light on the extent and variability of brain tissue that underlies language processing, and addresses the tantalizing questions of how language modality, sign and speech, impact language representation in the 7brain.     

Schizotypal personality traits and prediction of one's own movements in motor control: what causes an abnormal sense of agency?

Background. Positive schizophrenic symptoms, especially passivity phenomena, including auditory hallucinations, may be caused by an abnormal sense of agency, which people with schizotypal personality traits also tend to exhibit. A sense of agency asserts that it is oneself who is causing or generating an action. It is possible that this abnormal sense of self-agency is attributable to the abnormal prediction of one’s own movements in motor control. Method. We conducted an experiment using the “disappeared cursor” paradigm in which non-clinical, healthy participants were required to click on a target using an invisible mouse cursor. Prediction error was defined as the distance between the target and the click point. Results. The results showed that schizotypal personality traits, but not depressive or anxious traits, were correlated with deficits in predicting movements of the subjects’ left hand. In particular, auditory hallucination proneness had the strongest relationship with movement prediction error. In this report, we also discuss the error tendency (overestimations or underestimations of one’s own movements). Conclusions. This finding is in accordance with the idea that passivity phenomena or proneness may be caused by the abnormal prediction of one’s own actions or movements.     

Cognitive Coping Tool Kit for Psychosis: Development of a Group-Based Curriculum

This article outlines an 8-week curriculum that was created to help outpatients develop cognitive and behavioral skills for coping with delusions and hallucinations as well as to reduce patients’ comorbid subjective levels of distress (e.g., depression, anxiety). The manualized protocol consisted of psychoeducation and training in a variety of CBT skills that have shown promise in treating individuals with residual psychosis, using recovery-oriented “naturalistic” methods and culminating in the creation of an individualized “tool kit” of cognitive coping resources. A preliminary study of the effectiveness of this brief group-based CBT program for outpatients with chronic, residual symptoms of schizophrenia was conducted. Participants were 24 outpatients diagnosed with schizophrenia spectrum disorders who were stable on medications and connected to case management community follow-up. The Positive and Negative Syndrome Scale for Schizophrenia interview and the Symptom Checklist-90 self-report symptom scales were administered pre- and post-intervention. The results suggest that there were significant improvements in psychotic symptoms and self-reported distress from pre- to posttreatment.     

Cognitive epidemiology: With emphasis on untangling cognitive ability and socioeconomic status

This commentary touches on practical, public policy, and social science domains informed by cognitive epidemiology while pulling together common themes running through this important special issue. As is made clear in the contributions assembled here, and others (Deary, Whalley, & Starr, 2009; Gottfredson, 2004; Lubinski & Humphreys, 1992, 1997), social scientists and practitioners cannot afford to neglect cognitive ability when modeling epidemiological and health care phenomena. However, given the dominant concern about the confounding of general cognitive ability (GCA) and socioeconomic status (SES), and the extent to which SES is frequently seen as the primary cause of health disparities (while GCA is neglected as a possible influence in epidemiology and health psychology), some methodological applications for untangling the relative influences of GCA and SES are reviewed. In addition, cognitive epidemiology is placed in a broader context: Just as cognitive epidemiology facilitates an understanding of pathology (“at risk” populations, and ways to attenuate undesirable personal and social conditions), it may also enrich our understanding of optimal functioning (“at promise” populations, and ways to identify and nurture the human and social capital needed to develop innovations for saving lives, economies, and perhaps even our planet). Finally, while GCA is likely the most important dimension in the study of individual differences for modeling healthy behaviors and outcomes, other relatively independent dimensions of psychological diversity do add value (Krueger, Caspi, & Moffitt, 2000). For example, compliance has at least two psychological components: a “can do” competency component (ability) and a “will do” motivational component (conscientiousness). Ultimately, developing and modeling healthy behaviors, interpersonal environments, and medical maladies are best accomplished by teaming multiple dimensions of human individuality.     

Stimulus Characteristics Determine Processing Approach on Random Array Letter-Cancellation Tasks

Target-to-distractor ratio strongly influences performance on typical random array letter cancellation tasks, suggesting that a “controlled” processing approach is used. This study was designed to determine whether “automatic” processing could be also demonstrated in the random array cancellation paradigm by changing the perceptual characteristics of the stimuli. Thirty-two healthy subjects sequentially performed four random array cancellation tasks with 50 and 100 stimuli. The letters “I” or “O' were targets and “L” served as the distractor. Performance was measured by the number of correctly canceled targets divided by the time to completion, corrected for accuracy. There was a strong effect of the number of stimuli on forms using I targets (p< .00001), but not for O's (p= .15) Performance scores were lower for I target forms than for O targets. These findings demonstrate that performance approximating “automatic” processing can also be elicited on clinically useful, office-based, or bedside tests such as random array cancellation.     

The Meaning of Meaning-Fallibilism

Much discussion of meaning by philosophers over the last 300 years has been predicated on a Cartesian first-person authority (i.e. “infallibilism”) with respect to what one’s terms mean. However this has problems making sense of the way the meanings of scientific terms develop, an increase in scientific knowledge over and above scientists’ ability to quantify over new entities. Although a recent conspicuous embrace of rigid designation has broken up traditional meaning-infallibilism to some extent, this new dimension to the meaning of terms such as “water” is yet to receive a principled epistemological undergirding (beyond the deliverances of “intuition” with respect to certain somewhat unusual possible worlds). Charles Peirce’s distinctive, naturalistic philosophy of language is mined to provide a more thoroughly fallibilist, and thus more realist, approach to meaning, with the requisite epistemology. Both his pragmatism and his triadic account of representation, it is argued, produce an original approach to meaning, analysing it in processual rather than objectual terms, and opening a distinction between “meaning for us”, the meaning a term has at any given time for any given community and “meaning simpliciter”. the way use of a given term develops over time (often due to a posteriori input from the world which is unable to be anticipated in advance). This account provocatively undermines a certain distinction between “semantics” and “ontology” which is often taken for granted in discussions of realism.     

Show-That-I-Can (Homework) in Cognitive-Behavioral Therapy for Anxious Youth: Individualizing Homework for Robert

Cognitive-behavioral therapy (CBT) has been reviewed and described as an empirically supported treatment for anxious youth. One component of CBT is the use of out-of-session “Show That I Can” tasks (STIC; i.e., homework tasks). STIC tasks vary in content and are to be completed between sessions. We discuss homework in CBT for Robert, a 13-year-old boy with social anxiety. Robert experienced distressing anxiety participating in and giving presentations at school and was fearful of open-ended questions. Robert had difficulty maintaining conversations with peers and reported being preoccupied with a concern that he would say something “weird” or “stupid.” Robert avoided numerous situations, and his social anxiety affected his grades, social interactions, family, and quality of life. Robert’s initial homework tasks entailed (a) journaling and self-monitoring anxious feelings and thoughts, and (b) practicing relaxation skills. During the second half of treatment, Robert’s STIC assignments were exposure tasks, including (a) opinion discussion assignments, (b) participating in class, and (c) initiating conversations with children at the bus stop. The present discussion focuses on how homework was individualized and presented so that it was palatable and sensitive. Issues regarding out-of-session exposure tasks that elicit sufficient anxiety, resistance to high-level exposure tasks, and parent involvement are explored.     

Personality from a realist’s perspective: Personality traits, criminal behaviors, and the externalizing spectrum

Reviews ways in which the author’s program of research has been influenced by Tellegen’s (1991) conceptualization of personality traits as both real and biologically based entities. Analyses of longitudinal-epidemiological data on personality and criminal behavior indicate that personality measures and measures of criminal behavior can be conceived of as indicators of a latent, stable propensity to act in an unconstrained manner. In addition, an unconstrained personality style, substance dependence, and antisocial behavior can be modeled as indicators of a highly heritable propensity towards “externalizing” or acting-out behaviors, with environmental factors playing a key role in determining the specific way in which this general, heritable externalizing propensity is expressed. Such research outlines the value of concepts from personality psychology in understanding consequential behaviors in the population at large.