A dynamic developmental theory of attention-deficit/hyperactivity disorder (ADHD) predominantly hyperactive/impulsive and combined subtypes

Attention-deficit/hyperactivity disorder (ADHD) is currently defined as a cognitive/behavioral developmental disorder where all clinical criteria are behavioral. Inattentiveness, overactivity, and impulsiveness are presently regarded as the main clinical symptoms. The dynamic developmental behavioral theory is based on the hypothesis that altered dopaminergic function plays a pivotal role by failing to modulate nondopaminergic (primarily glutamate and GABA) signal transmission appropriately. A hypofunctioning mesolimbic dopamine branch produces altered reinforcement of behavior and deficient extinction of previously reinforced behavior. This gives rise to delay aversion, development of hyperactivity in novel situations, impulsiveness, deficient sustained attention, increased behavioral variability, and failure to "inhibit" responses ("disinhibition"). A hypofunctioning mesocortical dopamine branch will cause attention response deficiencies (deficient orienting responses, impaired saccadic eye movements, and poorer attention responses toward a target) and poor behavioral planning (poor executive functions). A hypofunctioning nigrostriatal dopamine branch will cause impaired modulation of motor functions and deficient nondeclarative habit learning and memory. These impairments will give rise to apparent developmental delay, clumsiness, neurological "soft signs," and a "failure to inhibit" responses when quick reactions are required. Hypofunctioning dopamine branches represent the main individual predispositions in the present theory. The theory predicts that behavior and symptoms in ADHD result from the interplay between individual predispositions and the surroundings. The exact ADHD symptoms at a particular time in life will vary and be influenced by factors having positive or negative effects on symptom development. Altered or deficient learning and motor functions will produce special needs for optimal parenting and societal styles. Medication will to some degree normalize the underlying dopamine dysfunction and reduce the special needs of these children. The theory describes how individual predispositions interact with these conditions to produce behavioral, emotional, and cognitive effects that can turn into relatively stable behavioral patterns.     

Time Perception in Boys With Attention-Deficit/Hyperactivity Disorder According to Time Duration,Distraction and Mode of Presentation

The present study describes the incidence of test refusal at neuropsychological assessment, investigates its correlates, and its stability. The participants were 124 children aged 3.5 years whose development has been followed from birth in the Jyväskylä Longitudinal Study of Dyslexia (JLD). The frequency of test refusal on the Finnish version of the NEPSY was analyzed with respect to the children's concurrent and earlier cognitive and language skills, assessed using tests and parental ratings. Refusal during test-taking was found to be relatively common at this age, and high frequency of refusal at an earlier age was associated with similar tendency at a later age. High test refusal was associated with compromised neuropsychological and linguistic test scores. Missing data due to refusal were more common in neuropsychological tasks requiring verbal production. It is concluded that test refusals reflect a child's poor underlying skills and an attempt to avoid failure, rather than noncompliant or oppositional behavior.     

Motivation to Manage in China and Hong Kong: A Gender Comparison of Managers

Although women comprise an important part of the labor force in Hong Kong and the People's Republic of China (PRC), they remain underrepresented and underutilized in managerial positions. This study investigates the applicability of role motivation theory in the Chinese culture and examines if lack of motivation to manage is a potential explanation for this underrepresentation. Data were collected from 127 Hong Kong (68 men and 59 women) and 175 mainland Chinese (128 men and 47 women) managers. As expected, Hong Kong managers possess significantly higher levels of motivation to manage than do their PRC counterparts. There are, however, no significant gender-based differences in levels of motivation to manage in either Hong Kong or the PRC. Lack of motivation to manage does not appear to contribute to the underutilization of Chinese women in management in Hong Kong and mainland China.     

Panic disorder: A product of classical conditioning

Contrary to the common view that all panic attacks have a single etiology, it is shown that a distinction must be made between initial attacks, for which there are many causes, and recurrent attacks (panic disorder) which have a common basis. Most initial panic attacks are attributable to the physiological effects of hyperventilation resulting from severe and prolonged anxiety. It has been claimed that the attacks are due to such symptoms as dyspnea, tachycardia and dizziness being misattributed to deadly illness or incipient insanity. We reject this view on several grounds, and in particular because of a pilot study that showed that such attributions follow the onset of panic. Apart from some biological cases, the common initial panic is an unconditioned response to a bizarre stimulus complex produced by excessive hyperventilation, and panic disorder is the result of contiguous stimuli, especially endogenous stimuli, being conditioned to the elicited anxiety. Treatment accords with principles of conditioning.     

Maternal sensitivity and overt aggression in young children with Down syndrome

Children with genetic syndromes offer a unique opportunity to combine genetic and environmental approaches to the study of aggression. Children with genetic syndromes associated with developmental delay are at increased risk for behavior problems, but little is known about risk and resilience factors. In this study, we examined maternal sensitivity of mothers of children with Down syndrome using home observations when their children were 2, 3, and 5 years old, and relations with maternal reports and observations of overt aggression at school at age 5. Maternal sensitivity at ages 2 and 3 years did not significantly predict child aggression at age 5, but low maternal sensitivity at age 5 was significantly related to overt aggression at both home and school. By replicating and extending earlier work, this study informs developmental theory and identifies an important maternal variable related to aggression in children with Down syndrome.     

“Communities isn't just about trees and shops”: students from two South African universities engage in dialogue about ‘community’ and ‘community work’

The question of what constitutes ‘a community’ or even ‘the community’ takes on an extra salience in a divided society such as South Africa where the entire environment remains imprinted with the legacy of enforced segregation along racial lines. Higher education institutions need to prepare emerging health and social service students for the world of practice in a context of diversity, continuing segregation and marked inequality. As one step to helping students deal with working in a divided society, academic departments from two different South African universities have been involved in a collaborative teaching and research project. Fourth year psychology and social work students from the two universities took part in a collaborative, practical course which formed part of their curricula. In this course, students were given the opportunity to engage with the notion of ‘community’ and ‘community work’ with each other. The students came from diverse racial, class and political backgrounds, and by engaging with one another as they did, had the opportunity to ‘visit’ worlds they have rarely had access to. While this course was able to achieve a broadening awareness among students from different backgrounds about the notion of community, it will take both more engagement with courses of this kind, and a continuing history of change in South Africa, for students to feel more comfortable in transcending both physical and psychological boundaries. Copyright © 2007 John Wiley & Sons, Ltd.