The clenching-grinding spectrum and fear circuitry disorders: clinical insights from the neuroscience/paleoanthropology interface

This review discusses the clenching-grinding spectrum from the neuropsychiatric/neuroevolutionary perspective. In neuropsychiatry, signs of jaw clenching may be a useful objective marker for detecting or substantiating a self-report of current subjective emotional distress. Similarly, accelerated tooth wear may be an objective clinical sign for detecting, or substantiating, long-lasting anxiety. Clenching-grinding behaviors affect at least 8 percent of the population. We argue that during the early paleolithic environment of evolutionary adaptedness, jaw clenching was an adaptive trait because it rapidly strengthened the masseter and temporalis muscles, enabling a stronger, deeper and therefore more lethal bite in expectation of conflict (warfare) with conspecifics. Similarly, sharper incisors produced by teeth grinding may have served as weaponry during early human combat. We posit that alleles predisposing to fear-induced clenching-grinding were evolutionarily conserved in the human clade (lineage) since they remained adaptive for anatomically and mitochondrially modern humans (Homo sapiens) well into the mid-paleolithic. Clenching-grinding, sleep bruxism, myofacial pain, craniomaxillofacial musculoskeletal pain, temporomandibular disorders, oro-facial pain, and the fibromyalgia/chronic fatigue spectrum disorders are linked. A 2003 Cochrane meta-analysis concluded that dental procedures for the above spectrum disorders are not evidence based. There is a need for early detection of clenching-grinding in anxiety disorder clinics and for research into science-based interventions. Finally, research needs to examine the possible utility of incorporating physical signs into Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition posttraumatic stress disorder diagnostic criteria. One of the diagnostic criterion that may need to undergo a revision in Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition is Criterion D (persistent fear-circuitry activation not present before the trauma). Grinding-induced incisor wear, and clenching-induced palpable masseter tenderness may be examples of such objective physical signs of persistent fear-circuitry activation (posttraumatic stress disorder Criterion D).     

Using the Past to Enhance the Present: Boosting Happiness Through Positive Reminiscence

Two studies explored relations between positive reminiscing and emotional experience – a survey of naturally occurring reminiscence (Study 1) and a field experiment testing the affective consequences of two styles of reminiscing (Study 2). In Study 1, frequency of positive reminiscing predicted perceived ability to enjoy life, and students who reminisced using cognitive imagery reported a greater ability to savor positive events than those who reminisced using memorabilia. In Study 2, students were randomly assigned either to reminisce about pleasant memories using cognitive imagery, reminisce about pleasant memories using memorabilia, or think about current concerns (control condition) for 10 min twice daily for a week. Both reminiscence groups reported greater increases in the percent of time they felt happy over the past week than the control group; and happiness increased more in the cognitive imagery group than in the memorabilia group.     

What is the optimal position of low-frequency words across line boundaries? An eye movement investigation

When displaying text on a page or a screen, only a finite number of characters can be presented on a single line. If the text exceeds that finite value, then text wrapping occurs. Often this process results in longer, more difficult to process words being positioned at the start of a line. We conducted an eye movement study to examine how this artefact of text wrapping affects passage reading. This allowed us to answer the question: should word difficulty be used when determining line breaks? Thirty-nine participants read 20 passages where low-frequency target words were either line-initial or line-final. There was no statistically reliable effect of our manipulation on passage reading time or comprehension despite several effects at a local level. Regarding our primary research question, the evidence suggests that word difficulty may not need to be accounted for when determining line breaks and assigning words to new lines.     

Filling in the Gaps: False Memories and Partisan Bias

While cognitive psychologists have learned a great deal about people's propensity for constructing and acting on false memories, the connection between false memories and politics remains understudied. If partisan bias guides the adoption of beliefs and colors one's interpretation of new events and information, so too might it prove powerful enough to fabricate memories of political circumstances. Across two studies, we first distinguish false memories from false beliefs and expressive responses; false political memories appear to be genuine and subject to partisan bias. We also examine the political and psychological correlates of false memories. Nearly a third of respondents reported remembering a fabricated or factually altered political event, with many going so far as to convey the circumstances under which they “heard about” the event. False-memory recall is correlated with the strength of partisan attachments, interest in politics, and participation, as well as narcissism, conspiratorial thinking, and cognitive ability.     

Civic Engagement in a Post-Communist State

During the communist era, numerous social and political constraints limited civic engagement in communities throughout Central and Eastern Europe. This paper explores whether such constraints have left lasting marks, and whether such lingering effects potentially slow the process of democratization. Three specific questions were explored: (1) whether civic engagement in a post-communist state differs from that in an established Western democracy; (2) whether the quality of social perception suffers when civic engagement is constrained; and (3) whether a link exists between civic engagement and tangible forms of political judgment. Data were analyzed from surveys conducted in Cluj-Napoca, Romania, in 1994 and in South Bend, Indiana, in 1984. Compared with South Bend residents, the people of Cluj-Napoca discuss politics less, engage in interactive forms of political participation at lower rates, know less about their neighbors, and fail to link the interests of people in the community to broader political judgments. Given the centrality of civic engagement to democratic legitimacy, these findings justify concern regarding the prospects for full democratization in Central and Eastern European contexts in which social interaction does not yet flourish.     

REDUCING THE ILLEGAL SALES OF CIGARETTES TO MINORS: ANALYSIS OF ALTERNATIVE ENFORCEMENT SCHEDULES

The majority of adolescent smokers are able to purchase cigarettes even though laws prohibit the sale of cigarettes to minors (Radecki & Zdunich, 1993). The present study focused on merchant licensing, civil penalties, and monitoring of merchant behavior. Several different schedules of enforcement in the city of Chicago were evaluated to determine the optimal schedules to reduce the sale of cigarettes to minors in a major metropolitan area. Schedules of 2, 4, and 6 months were effective in reducing illegal sales, from 86% to 19%, 87% to 34%, and 87% to 42%, respectively. In a control condition, illegal sales remained high (approximately 84%). Cigarette control laws that regularly enforce civil penalties for tobacco sales violations can successfully reduce minors' access to cigarettes.     

Graduate trends for one marriage and family therapy program in an interdisciplinary setting

This research compared trends from 1981 to 1993 in several mental health professional training programs at the University of Houston Clear Lake, surveying graduates from three professional mental health master's programs—clinical psychology, school psychology, and family therapy—with the goal of identifying trends in the status of their professional credentialing and current employment. Four mental health groups have attained licensure since a 1981 survey, resulting in graduates now seeking professional licenses and perform psychotherapy more exclusively than other mental health activities. Interdisciplinary training has become increasingly important due to the introduction of managed care and other insurance regulating entities.