Biomedical subjects

Maryanne Martin

Publications and source records attributed to Maryanne Martin.

6 recordsLinked to original sources

PubMed2006

Asymptotic learning of alphanumeric coding in autobiographical memory.

Studies of autobiographical memory have shown that observed levels of incidental learning are often relatively low. Do low levels of retention result simply from a low learning rate, or is learning also asymptotic? To address this question, it is necessary to trace performance over a large number of learning opportunities, and this was carried out in the context of the recent development of widespread texting behaviour. It was found that memory for the alphanumeric layout of a phone improved as a function of sending approximately the first 500 texts, but then the improvement stopped. The incidence of memory error was incompatible with a simple power-law relation but was modelled closely by an asymptotic relation. It is suggested that this pattern reflects a movement towards automaticity in the primary task which progressively closes down the possibility that incidental learning can occur.

Adult↗

PubMed2006

Visual sharpness contingency in recognition memory for orientation: mnemonic illusion suppressed by sensory signature.

A striking finding about human memory is that people's level of accuracy in remembering the orientation of heads on coins is often not simply at the chance level but significantly below it. However, S. W. Kelly, A. M. Burton, T. Kato, and S. Akamatsu (2001) reported that this is not so when two-alternative forced-choice visual recognition is employed. The Kelly et al. result could not be replicated here with a copy of their stimuli. However, the result was successfully replicated with newly created stimuli. A series of experiments provided converging evidence that the mnemonic illusion is suppressed when recognition alternatives possess sharp visual detail. The role of a sensory signature in suppressing the mnemonic illusion and in modulating visual recognition performance in general is delineated.

Adolescent↗

PubMed2004

Illness-related parenting in mothers with functional gastrointestinal symptoms.

OBJECTIVE: Social learning has been identified as a factor that increases vulnerability to the development of irritable bowel syndrome (IBS). This study aimed to distinguish between child-mediated and parent-mediated modes of transmission of illness behavior. The reporting of infants' symptoms and treatment seeking for these symptoms, by mothers, was examined over the period during which infants were aged 0 to 18 months. Thus childrens' imitation of excessive maternal illness behavior could be ruled out as a possible cause of differences in treatment seeking. METHODS: Questionnaire data from the Avon Longitudinal Study of Parents and Children (ALSPAC) were analyzed, comparing illness-related parenting in 73 mothers who reported taking medication for functional bowel symptoms (mostly IBS) with parenting in 154 mothers who reported past or current stomach ulcers (SU). RESULTS: There were no significant differences between the groups in the reported incidence of infants' symptoms. However, mothers with bowel symptoms had taken their infants to the doctor for a greater number of conditions than mothers reporting SU. This difference was not due to increased treatment seeking for gastrointestinal symptoms. CONCLUSIONS: Mothers with functional bowel symptoms are more likely to seek treatment when their infants experience symptoms, providing evidence of early social reinforcement of illness behavior. Such reinforcement may increase the child's vulnerability to a range of functional disorders, including IBS.

Adult↗

PubMed2002

Perceived vulnerability to illness in individuals with irritable bowel syndrome.

OBJECTIVE: To determine whether individuals with irritable bowel syndrome (IBS) differ from other individuals in their perceived lifetime risk of an unrelated medical condition. METHOD: A questionnaire was used to assess worry about deep vein thrombosis (DVT) and perceived future risk of developing the condition in individuals with IBS and controls following a media scare concerning DVT. RESULTS: Individuals with IBS reported higher perceived lifetime risk of DVT than did healthy controls or individuals with asthma. Current physical symptoms, exposure to information about DVT and the illness attitudes measured could not entirely account for the higher perceived health risk among individuals with IBS. CONCLUSIONS: A perception of enhanced personal vulnerability to illness appears to be present in individuals with IBS, although it is possible that this perception is related to higher levels of negative affect amongst this group. Whilst a perception of enhanced vulnerability to illness is likely to contribute to IBS-related illness behaviour, it does not appear to be specific to reasoning about IBS and is also apparent when individuals consider an unrelated health issue.

Adolescent↗

PubMedDate not supplied

Social learning, affective state and passive coping in irritable bowel syndrome and inflammatory bowel disease.

The association between the use of passive coping strategies to deal with pain and reported levels of anxiety, depression, and parental reinforcement of illness behavior was examined in individuals with Irritable Bowel Syndrome (IBS) and Inflammatory Bowel Disease (IBD). Individuals with IBS and IBD recruited primarily from outpatient clinics completed questionnaire measures of pain-coping (the Vanderbilt Pain Management Inventory, VPMI) as well as measures of anxiety and depression, parental reinforcement of illness behavior and physical symptoms. Factor analysis of the passive coping sub-scale of the VPMI indicated that it was comprised of two components corresponding to emotional and behavioral facets of passive coping. Higher levels of behavioral passive coping were associated with higher levels of parental reinforcement of illness behavior and higher levels of depression, but only amongst individuals with IBS. In contrast emotional passive coping was associated in both groups with higher levels of anxiety and depression (but not illness-related social learning). Different factors predict the use of emotional and behavioral passive coping strategies in IBS and IBD. It is suggested that illness-related social learning occurring during childhood influences the development of habitual illness behaviors and that, because of the more benign nature of symptoms in IBS, individuals with IBS may be more likely than individuals with IBD to revert to such habitual behaviors to cope with symptoms. The degree to which the emotional component of passive coping, associated with psychological distress in both groups, can be considered in terms of 'coping strategies', rather than markers of illness-related distress, is discussed.

Adaptation, Psychological↗

PubMedDate not supplied

Does depression influence symptom severity in irritable bowel syndrome? Case study of a patient with irritable bowel syndrome and bipolar disorder.

OBJECTIVE: Irritable bowel syndrome (IBS) is frequently associated with mood disorder. However, it is typically difficult to distinguish between disturbed mood as a causal agent and disturbed mood as a consequence of the experience of IBS. This report considers the association between mood and symptom severity in a patient with diarrhea-predominant IBS and stable, rapid cycling bipolar disorder with a predominantly depressive course. Such a case provides an important opportunity to determine the direction of the relationship between mood and IBS symptom severity because the fluctuations of mood in bipolar disorder are assumed to be driven largely by biological, rather than psychosocial, processes. METHODS: The study was carried out prospectively, with ratings of mood and IBS symptom severity made daily by the patient for a period of almost 12 months. RESULTS: The patient experienced regular and substantial changes in mood as well as fluctuations in the level of IBS symptoms during the study period. Contrary to expectation, the correlation between mood and IBS symptom severity on the same day suggested that the patient experienced less severe IBS symptoms during periods of more severe depression. However, time series analysis revealed no significant association between these two processes when serial dependence within each series was controlled for. CONCLUSIONS: The unusual co-occurrence of IBS with bipolar disorder provides direct evidence to indicate that depression does not necessarily lead to an increase in the reported severity of IBS, at least in the context of bipolar disorder, and may under certain circumstances actually be associated with a reduction in the severity of IBS symptoms. Factors that might moderate the relationship between depression and symptom severity are discussed.

Affect↗