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Do specific EEG frequencies indicate different processes during mental calculation?

EEG recordings during mental calculation and a control task (with presentation of stimuli with similar physical characteristics to the arithmetic symbols) were obtained in 10 subjects. Narrow band analyses of the EEG and distributed sources for each EEG frequency were calculated using variable resolution electromagnetic tomography. Significant differences between the sources for arithmetic and control tasks were observed at 3.9 Hz within Broca's and left parietotemporal cortices, suggesting that this frequency may be related with the production of internal speech, storage and rehearsal of verbal working memory. Differences at 5.46 Hz within the right dorsolateral prefrontal cortex were considered to be associated to sustained attention. The decrease at 12.46 Hz within the left parietal cortex was interpreted as a sign of retrieval of arithmetic facts from long term memory.

Adult↗

Differences between mentally retarded and nonretarded persons' efficiency of auditory sentence processing.

Mentally retarded adolescents and MA-matched nonretarded children participated in three experiments designed to examine differences in language-processing efficiency. A compressed speech technique was used in Experiments 1 and 2. Experiment 3 relied on a sentence-picture verification procedure. Our results suggest that retarded and nonretarded individuals differ in the speed with which they are able to execute the semantic-analytic processes but not necessarily the phonological encoding processes that are involved in auditory language comprehension. In addition, the data suggest a possible group difference in the quality of the semantic representation encoded during sentence processing.

Adolescent↗

Ironic processes of mental control.

A theory of ironic processes of mental control is proposed to account for the intentional and counterintentional effects that result from efforts at self-control of mental states. The theory holds that an attempt to control the mind introduces 2 processes: (a) an operating process that promotes the intended change by searching for mental contents consistent with the intended state and (b) a monitoring process that tests whether the operating process is needed by searching for mental contents inconsistent with the intended state. The operating process requires greater cognitive capacity and normally has more pronounced cognitive effects than the monitoring process, and the 2 working together thus promote whatever degree of mental control is enjoyed. Under conditions that reduce capacity, however, the monitoring process may supersede the operating process and thus enhance the person's sensitivity to mental contents that are the ironic opposite of those that are intended.

Arousal↗

Dynamic cortical activation in mental image processing revealed by biomagnetic measurement.

The mental rotation task has been reported to activate the human parietal and extra-striate areas, based on the results of fMRI and PET analysis. In the present study, we investigated the dynamic properties of the distributed cortical activity related to mental rotation processes at high temporal resolution by means of brain magnetic field measurements and a linear inversion algorithm. Distributed neural activities during the mental rotation and control tasks were estimated for six subjects, and the differences in the activity distribution were analyzed. Statistically significant differences in the parietal and lateral posterior temporal region were detected 200-300 ms after the visual stimulus, indicating that the dorsal and ventral pathway were included in the mental image processing.

Adult↗

Mental resources, processing speed, and inhibitory control: a developmental perspective.

The present article addresses the claim that the speed of information processing qualifies as a processing resource. This claim contends that age-related changes in processing speed pertain to all cognitive processes to the same proportional degree. That is, processing speed is compared to the clock speed of a microcomputer: as young children's clock speed increases, the speed of processing in all cognitive processes increases until the adult level is reached. Re-analyses of recent behavioral and psychophysiological data provide evidence against the notion that development is characterized by an increase in children's global clock speed, and refute the claim that processing speed operates as a mental resource on which all cognitive processes depend to the same extent. Rather, the results emphasize the role of inhibitory control in cognitive development, and we consider the relevance of inhibitory development to the issue of age-related changes in processing capacity.

Evoked Potentials↗

South African Mental Health Process Indicators.

BACKGROUND: In post-apartheid South Africa the organisation and delivery of mental health care is undergoing significant change. With the heritage of an under-resourced, fragmented, racially inequitable service, heavily reliant on chronic custodial treatment in large centralised institutions, this change is long overdue. New policy has set out a vision for a community-based, comprehensive, integrated mental health service. In order to realise this vision a review is required of the way in which care is currently delivered, or the 'process' of mental health care. To date, no national research has been conducted regarding process of care indicators in South African mental health services. AIMS OF THE STUDY: This study documents four public sector mental health service process indicators in South Africa: bed occupancy rates, admission rates, average length of stay and default rates. METHODS: A questionnaire was distributed to provincial mental health co-ordinators, requesting numbers of occupied and available beds in psychiatric inpatient facilities, annual mental health admissions, average length of stay (ALOS), and default rate in ambulatory care settings. The information was supplemented by consultations with mental health co-ordinators in each of the 9 provinces. RESULTS: The national bed occupancy rate is 83% (range: 63-109%). The national annual rate of admission to psychiatric inpatient facilities is 150 per 100 000 population (range: 33-300). The national average length of admission is 219 days in psychiatric hospitals, 11 days in general regional hospitals and 7 days in general district hospitals. On average 11% of psychiatric patients who attend ambulatory care services on a monthly basis fail to keep their appointments. DISCUSSION: Although the national mean bed occupancy is compatible with international figures, there is considerable discrepancy between provinces, indicating both over- and under- utilisation of inpatient resources. Admission rates are low, relative to developed countries, though comparable to developing countries. Low admission rates are associated with a range of factors including inadequate service provision, unmet need, inaccessible services, cross-border flow between provinces and custodial patterns of care. There is evidence of long periods of admission relative to international settings. There is also considerable diversity between provinces, with certain institutions continuing to provide long term custodial patterns of care. Default rates are low relative to international settings and past reports default in South Africa. IMPLICATIONS FOR HEALTH POLICIES: In keeping with current policies there is an urgent need for local level evaluation and reform of chronic custodial care. The ongoing monitoring of process indicators is important in the transition to community-based mental health care. IMPLICATIONS FOR FURTHER RESEARCH: Limitations of the data, and problems of collecting information on mental health care within an integrated health system indicate the need for further research in this area. There is also a need for further research into unmet need for mental health care in South Africa.

Journal Article↗

Processes of mental health service use by adolescents with depression.

PURPOSE: To begin development of a substantive theory of the processes of mental health service use by adolescents who are depressed and by their families. DESIGN: Grounded theory. METHODS: Open-ended interviews were conducted with 52 young adults who were depressed as adolescents, four of their parents, and eight professionals who work with adolescents who are depressed. The constant comparison method was used to analyze the data. FINDINGS: Adolescents who are depressed and their families perceived several "treatment pitfalls" associated with formal mental health services: (a) "They'll (mental health clinicians) think I'm crazy," (b) "They'll tell my business," and (c) "They won't have a clue." The adolescents and their families interacted with the mental health care providers by engaging in the psychosocial process of "venturing through the system," that is, proceeding despite possible dangers and risks by steering clear, holding back, and letting it take hold. CONCLUSIONS: Mental health service use by adolescents with depression involved complex and fluid interactional processes among the depressed adolescents, their parents or caretakers, and mental health care providers. Strategies are needed to avoid creating the pitfalls that concern adolescents and their families.

Adolescent↗

The relationship between cardiac function and neuropsychological status among heart transplant candidates.

BACKGROUND: Cognitive deficits among heart transplant candidates have been well documented. This study was designed to examine the hypothesis that impaired cognitive test performance among heart transplant candidates may be attributed, in part, to decreased cerebral perfusion secondary to poor cardiac function. METHODS AND RESULTS: Sixty-two patients participated in the study who underwent heart catheterization within 1 day of completing a battery of cognitive tests. Multiple demographic and patient characteristics were examined for their potential moderating role in the relationship between measures of cardiac function and cognitive performance including age, education, race, gender, psychiatric history, medication usage, cardiac surgical history, and self-reported symptoms of depression and anxiety. Only age and education were significantly related to cognitive performance (P < .01). Thus, partial correlation analyses controlling for age and education were used to examine the relationship between cardiac function and cognitive performance. In general, increasing hemodynamic pressure variables (ie, pulmonary artery pressure and right atrial pressure), and to a lesser extent cardiac output and cardiac index, were related (r = - .32 to - .43; P < .01) to decreased performance on cognitive tasks that assessed simple attention, speed of mental processing, and mental flexibility (Digit Span-Forward, Trail Making Test-Part B, Symbol Digits Modalities Test, and Stroop Neuropsychological Screening Test). Left ventricular ejection fraction, systemic and pulmonary vascular resistance, and mean arterial pressure were largely unrelated to cognitive performance in this sample of patients with end stage cardiac disease. CONCLUSIONS: Hemodynamic pressure variables seem to be most consistently related (ie, inversely) to cognitive functioning among heart transplant candidates.

Cognition Disorders↗

Number processing and calculation--normative data from healthy adults.

Despite the high incidence of numerical deficits in neurological patients, little attention has been paid to the development of diagnostic tools. In fact, most of the published reports on acquired numerical disorders, whether single case or group studies, do not refer to standardised measures of performance providing little, if any, control data specifically collected for the examination. In this study we present data of 282 healthy controls of different age groups and educational levels in a new battery of Number Processing and Calculation (NPC). The NPC battery includes a total of 35 tasks, assessing different counting abilities, various aspects of number comprehension (such as parity and magnitude judgements), numerical transcoding, calculation, arithmetic reasoning and conceptual knowledge. Special attention is paid to the assessment of different calculation abilities, including simple fact retrieval, rule based processing, mental calculation and written calculation in all four operations. Moreover, text problem solving is assessed as well as the understanding of arithmetic principles. Thus, the NPC battery differs from the EC 301 battery proposed by Deloche et al., 1994 (Dellatolas, Deloche, Basso, & Claros-Salinas, 2001) and allows a more fine grained diagnosis which is relevant for planning targeted interventions. The battery is easy to administer and does not require special materials or equipment.

Adolescent↗

Four types of visual mental imagery processing in upright and tilted observers.

We investigated the role of body position on performance in four distinct types of mental imagery processing. Previous studies used the upright body position as standard procedure and therefore do not address the issue of whether mental imagery tasks are processed in accordance with ego-centered or gravitational coordinates. In the present study, the subjects were brought into one of three different body positions: upright, horizontal, or supine. In each of these body positions, we measured performance in four imagery tasks, which assessed (1) the ability to generate vivid, high-resolution mental images; (2) the ability to compose mental images from separate parts; (3) the ability to inspect patterns in mental images; and, (4) the ability to mentally rotate patterns in images. Not all processes were affected in the same way when subjects performed them in different body positions. Performance in the image composition and detection tasks depended on body position, whereas there was no such effect for the transformation and resolution tasks.

Adolescent↗

Risk analyses for the cognitive phenotype in Turner's syndrome: evidence of familial influence as a decisive factor.

The interindividual varying cognitive performance in female patients with Turner's syndrome has usually been attributed to the interindividual varying mosaicism with a consecutive variable loss of X-chromosome DNA or to secondary risk factors such as estrogen deficiency owing to ovarian failure. The aim of our study was to determine the specific impact of X chromosome-related features and associated risk factors, on the one hand and familial influences, on the other hand on the interindividual variation in the cognitive phenotype. One hundred and one subjects with Turner's syndrome and 53 sisters as controls for familial influences were examined by comparing the cognitive information processing abilities (Kaufmann Assessment Battery for Children [K-ABC]). Subjects with Turner's syndrome performed at a significantly lower level than sisters on all subscales (eg, Mental Processing Composite: Turner's syndrome 86.4 [SD 15.0] versus sisters 99.3 [SD 10.6]; P < .001). For the neurocognitive phenotype in subjects with Turner's syndrome, a significant correlation was found only with the sisters' cognitive abilities (Mental Processing Composite: r = .38, P < .05). In contrast, neither the individual mosaic status nor the known associated risk factors predicted the neurocognitive phenotype in Turner's syndrome. These results are corroborated in the regression analyses in those subjects with Turner's syndrome with a sister (Simultaneous Processing(sister) for Simultaneous Processing(Turner's syndrome): beta = .346, P < .05, corrected R2 = .049; and Mental Processing Composite(sister) for Mental Processing Composite(Turner's syndrome): beta = .354, P < .05, corrected R2 = .033). The interindividual variation of intellectual abilities in Turner's syndrome seems to be primarily related to familial coinfluences and not to the interindividual varying loss of X-chromosome DNA in terms of hidden mosaicism or potential associated risk factors.

Child↗

Modulation of spatial orientation processing by mental imagery instructions: a MEG study of representational momentum.

Under appropriate conditions, an observer's memory for the final position of an abruptly halted moving object is distorted in the direction of the represented motion. This phenomenon is called "representational momentum" (RM). We examined the effect of mental imagery instructions on the modulation of spatial orientation processing by testing for RM under conditions of picture versus body rotation perception and imagination. Behavioral data were gathered via classical reaction time and error measurements, whereas brain activity was recorded with the help of magnetoencephalography (MEG). Due to the so-called inverse problem and to signal complexity, results were described at the signal level rather than with the source location modeling. Brain magnetic field strength and spatial distribution, as well as latency of P200m evoked fields were used as neurocognitive markers. A task was devised where a subject examined a rotating sea horizon as seen from a virtual boat in order to extrapolate either the picture motion or the body motion relative to the picture while the latter disappeared temporarily until a test-view was displayed as a final orientation candidate. Results suggest that perceptual interpretation and extrapolation of visual motion in the roll plane capitalize on the fronto-parietal cortical networks involving working memory processes. Extrapolation of the rotational dynamics of sea horizon revealed a RM effect simulating the role of gravity in rotational equilibrium. Modulation of the P200m component reflected spatial orientation processing and a non-voluntary detection of an incongruity between displayed and expected final orientations given the implied motion. Neuromagnetic properties of anticipatory (Contingent Magnetic Variation) and evoked (P200m) brain magnetic fields suggest, respectively, differential allocation of attentional resources by mental imagery instructions (picture vs. body tilt), and a communality of neural structures (in the right centro-parietal region) for the control of both RM and mental rotation processes. Finally, the RM of the body motion is less prone to forward shifts than that of picture motion evidencing an internalization of the implied mass of the virtual body of the observer.

Adult↗

Motor dimension of visual mental image transformation processes.

This paper concerns the influence of perceptual motor skills on the transformation processes during mental visual imaging. We first administered a visual recognition task to subjects, during which they scanned and rotated visual mental images. Then, we measured motor skills in perceptual situations. The main result is that both mental scanning and mental rotation processes are quicker when they simulate a perceptual motor skill of the subject. Furthermore, mental rotation seems to be canceled when the hemisphere activated by perception has to control the behavioral response. These results suggest that visual mental images are transformed partly via motor processes.

Adolescent↗

[Central haemodynamics of people with different level of functional mobility of the nervous processes during mental and physical loadings].

The examinations of 116 healthy men aged 17-23 were carried out. A cardiac index, heart rhythm variability at rest, tilt test, mental and physical loading and functional mobility of nervous processes (FMNP) were measured. It was found out, that cardiac index after loading was lower in the persons with the high level of FMNP while heart rhythm variability was the highest in the persons with the middle level of FPNP.

Adolescent↗

Another look at dreaming: disentangling Freud's primary and secondary process theories.

The Interpretation of Dreams contains Freud's first and most complete articulation of the primary and secondary mental processes that serve as a framework for the workings of mind, conscious and unconscious. While it is generally believed that Freud proposed a single theory of dreaming, based on the primary process, a number of ambiguities, inconsistencies, and contradictions reflect an incomplete differentiation of the parts played by the two mental processes in dreaming. It is proposed that two radically different hypotheses about dreaming are embedded in Freud's work. The one implicit in classical dream interpretation is based on the assumption that dreams, like waking language, are representational, and are made up of symbols connected to latent unconscious thoughts. Whereas the symbols that constitute waking language are largely verbal and only partly unconscious, those that constitute dreams are presumably more thoroughly disguised and represented as arcane hallucinated hieroglyphs. From this perspective, both the language of the dream and that of waking life are secondary process manifestations. Interpretation of the dream using the secondary process model involves the assumption of a linear two-way "road" connecting manifest and latent aspects, which in one direction involves the work of dream construction and in the other permits the associative process of decoding and interpretation. Freud's more revolutionary hypothesis, whose implications he did not fully elaborate, is that dreams are the expression of a primary mental process that differs qualitatively from waking thought and hence are incomprehensible through a secondary process model. This seems more adequately to account for what is now known about dreaming, and is more consistent with the way dream interpretation is ordinarily conducted in clinical practice. Recognition that dreams are qualitatively distinctive expressions of mind may help to restore dreaming to its privileged position as a unique source of mental status information.

Dreams↗