Anxiety Disorders: Sloman L

Sloman L. · Department of Psychiatry, University of Toronto, Centre for Addiction and Mental Health, 250 College St, Toronto, On Canada M5T 1R8. · J Affect Disord. · Pubmed #17765322 No free full text.

Abstract: Difference amplification was the process whereby the difference in fitness between two competing individuals in early man was magnified by the results of the competition. It arises from adaptive and maladaptive cycles (characterized by depression and anxiety) that are initiated by winning and losing agonistic encounters. Those who were most successful were likely to find mates that were also successful and vice versa. This would have contributed to well-endowed progeny and accelerated phylogenetic evolution. The adaptive and maladaptive cycles of the difference amplification model are also a feature of the social rank and attachment models. Ineffective operation of social rank and attachment systems is associated with anxiety and depression. This paper introduces the notion that the efficient operation of these two systems in hierarchical encounters accelerates the phylogenetic adaptation of the individual's genetic line. This suggests an adaptive function of attachment and social rank mechanisms that has not been previously described. Social rank, attachment and difference amplification should be viewed as different aspects of a comprehensive evolutionary model of depression and anxiety. This new model has psychotherapeutic implications.

Sloman L, Farvolden P, Gilbert P, Price J. · Centre for Addiction and Mental Health, 250 College Street, Toronto, ON, Canada M5T 1R8. · J Affect Disord. · Pubmed #16442166 No free full text.

Abstract: This paper explores the well-known overlap of anxiety and depressive symptoms in mood and anxiety disorders. We suggest that the regulation of both negative and positive affects has served important adaptive functions (especially for coping with threats, losses, failures and defeats), and that in some contexts both affect systems require regulation at the same time (e.g. increased anxiety coupled with low positive affect). Here we will focus on how low positive and high negative affect in the individual experiencing losses and defeats regulates their competitive and acquisitive behaviors and in some cases may prevent, de-escalate, and possibly terminate on-going agonistic (hierarchical) encounters. When high negative affect (anxiety) and low positive affect (depression) fail to fulfill their adaptive roles, they tend to persist and often intensify. This may lead each affect control system to stimulate specific types of anxiety and depressive disorders, exhibiting features reminiscent of the original adaptive function of the behavior. Furthermore, as these different systems tend to operate in a synchronous fashion, the psychiatric syndromes they generate are often comorbid.

Manassis K, Fung D, Tannock R, Sloman L, Fiksenbaum L, McInnes A. · Department of Psychiatry, Hospital for Sick Children, Toronto, Ontario, Canada. · Depress Anxiety. · Pubmed #14625881 No free full text.

Abstract: Selective mutism (SM) occurs when a child persistently lacks speech in some social situations but not in others, despite the ability to use and comprehend language. While considered to be related to anxiety, SM is poorly understood and studies of SM children are often based on parent reports. This study developed a unique, non-verbally based assessment protocol for SM children in order to better characterize their clinical profile, language abilities, and learning abilities. A comparison was done with a group of children of similar age, with social phobia (SP) but no SM, to search for characteristics that might distinguish SM from other anxiety disorders. Twenty-three children participated in the study (14 SM and 9 SP). The assessment protocol included standardized anxiety rating scales, cognitive and academic tests, and a speech and language assessment. SM and SP groups showed similar levels of anxiety and academic ability, but the SM group showed some language impairments relative to the SP group. Though requiring replication with a larger sample and nonclinical comparison group, the results suggest that SM children can be assessed by non-verbal means and that their disorder is characterized by anxiety and subtle language impairments.