Index Of Cognitive Processing Research Articles

The Theta/Beta Ratio as an Index of Cognitive Processing in Adults With the Combined Type of Attention Deficit Hyperactivity Disorder.

An elevated theta/beta ratio in the EEG has long been observed among individuals with Attention Deficit Hyperactivity Disorder (ADHD). The theta/beta ratio was previously hypothesised to be an index of arousal, but a number of studies failed to find any association between the ratio and indices of arousal, instead proposing that the theta/beta ratio may actually be indicative of cognitive processing. This hypothesis was tested by Clarke et al using a sample of healthy adults, with results indicating that the theta/beta ratio correlated with a marker of cognitive processing (P300 latency in an auditory oddball task), while P300 amplitude correlated with an arousal marker (alpha power). The aim of this study was to test whether similar results could be found in a sample of 41 adults with the combined type of ADHD. EEGs were recorded during an eyes-closed resting condition and an auditory oddball task. Results demonstrated that the theta/beta ratio correlated significantly with P300 latency. Absolute alpha power did not correlate significantly with P300 amplitude or P300 latency. These results support the hypotheses that the theta/beta ratio is a marker of cognitive processing capacity in both the general population and in participants with ADHD, and that the alpha/arousal linkage is anomalous in ADHD.

Neurocognitive Markers During Prolonged Breath-Holding in Freedivers: An Event-Related EEG Study.

Since little is known concerning the psychological, cognitive, and neurophysiological factors that are involved in and important for phases of prolonged breath-holding (pBH) in freedivers, the present study uses electroencephalography (EEG) to investigate event-related neurocognitive markers during pBH of experienced freedivers that regularly train pBH. The purpose was to determine whether the well-known neurophysiological modulations elicited by hypoxic and hypercapnic conditions can also be detected during pBH induced hypoxic hypercapnia. Ten experienced free-divers (all male, aged 35.10 ± 7.89 years) were asked to hold their breath twice for 4 min per instance. During the first pBH, a checker board reversal task was presented and in the second four-min pBH phase a classical visual oddball paradigm was performed. A visual evoked potential (VEP) as an index of early visual processing (i.e., latencies and amplitudes of N75, P100, and N145) and the latency and amplitude of a P300 component (visual oddball paradigm) as an index of cognitive processing were investigated. In a counter-balanced cross-over design, all tasks were once performed during normal breathing (B), and once during pBH. All components were then compared between an early pBH (0–2 min) and a later pBH stage (2–4 min) and with the same time phases without pBH (i.e., during normal breathing). Statistical analyses using analyses of variance (ANOVA) revealed that comparisons between B and pBH yielded no significant changes either in the amplitude and latency of the VEP or in the P300. This indicates that neurocognitive markers, whether in an early visual processing stream or at a later cognitive processing stage, were not affected by pBH in experienced free-divers.

InSight Interaction: a multimodal and multifocal dialogue corpus

Research on the multimodal aspects of interactional language use requires high-quality multimodal resources. In contrast to the vast amount of available written language corpora and collections of transcribed spoken language, truly multimodal corpora including visual as well as auditory data are scarce. In this paper, we first discuss a few notable exceptions that do provide high-quality and multiple-angle video recordings of face-to-face conversations. We then present a new multimodal corpus design that adds two dimensions to the existing resources. First, the recording set-up was designed in such a way as to have a full view of the dialogue partners' gestural behaviour, including hand gestures, facial expressions and body posture. Second, by recording the participant perspective and behaviour during conversation, using head-mounted scene cameras and eye-trackers, we obtained a 3D landscape of the conversation, with detailed production information (scene camera and sound) and indices of cognitive processing (eye movements for gaze analysis) for both participants. In its current form, the resulting InSight Interaction Corpus consists of 15 recorded face-to-face interactions of 20 min each, of which five have been transcribed and annotated for a range of linguistic and gestural features, using the ELAN multimodal annotation tool.

The use of a T-maze to measure cognitive-motor function in cats (Felis catus).

Few tests have been developed to test the cognitive and motor capabilities of domestic cats, in spite of the suitability of cats for specific studies of neuroanatomy, infectious diseases, development, aging, and behavior. The present study evaluated a T-maze apparatus as a sensitive and reliable measure of cognition and motor function of cats. Eighteen purpose-bred, specific-pathogen-free, male, neutered domestic shorthair cats (Felis catus), 1-2 years of age, were trained and tested to a T-maze protocol using food rewards. The test protocol consisted of positional discrimination training (left arm or right arm) to criterion followed by two discrimination reversal tests. The two reversal tests documented the ability of the subjects to respond to a new reward location, and switch arms of the T-maze. Data were collected on side preference, number of correct responses, and latency of responses by the subjects. Aided by a customized computer program (CanCog Technologies), data were recorded electronically as each cat progressed from the start box to the reward arm. The protocol facilitated rapid training to a high and consistent level of performance during the discrimination training. This learning was associated with a decrease in the latency to traverse the maze to a mean of 4.80 ± 0.87 s indicating strong motivation and consistent performance. When the rewarded side was reversed in the test phase, cats required more trials to reach criterion, as expected, but again showed reliable learning. The latency to reward in the first session of reversal increased 86% from the first to the last trial indicating that it may provide a useful index of cognitive processing. Latencies subsequently decreased as the new reversal paradigm was learned. This paradigm provides a relatively rapid and reliable test of cognitive motor performance that can be used in various settings for evaluation of feline cognitive and motor function.

Relationship between neurophysiological indices of cognitive processes and MRI characteristics of some brain structures in healthy subjects and patients with schizophrenia

The relationships between the parameters of waves of auditory event-related potentials (ERPs) in the oddball paradigm and the volumes of the hippocampus, amygdala, and caudate nuclei were analyzed in healthy subjects and patients with schizophrenia. The data obtained suggest that faster mental processes and stronger activation and/or synchronization of the activity of ERP wave generators in healthy subjects correspond to smaller volumes of the structures studied. The structure of the relationships in patients with schizophrenia differed from the normal one; significant correlations were observed with the volume of the caudate nuclei, and more pronounced “normalization” of neurophysiological characteristics was associated with large volumes of these structures.

Physiological Methods and Measurements in Driving Simulation

Driving simulators provide a closely controlled environment for examining links between human physiology and behavior. Physiologic measurements in different driving tasks can assess body temperature, heart rate, respiratory rate, galvanic skin response, electroencephalographic activity, electromyography activity, gastric activity, eyelid closure (as an index of alertness and arousal), and eye movements (as an index of cognitive processing). Synchronous measures of driver physiology and performance in driving simulator scenarios can illuminate relationships between cognitive deficits and performance errors in drivers who lack awareness of self-impairment and environmental hazards. Demonstrations include falling asleep at the controls in drivers affected by cognitive overload, fatigue, prescription medicine or drug effects, or mental decline from brain disease.

Neuroergonomics: Opportunities and challenges of merging cognitive neuroscience with cognitive ergonomics

As with any merger of previously unrelated scientific disciplines, the usefulness of combining cognitive neuroscience and cognitive ergonomics to create the new field of 'neuroergonomics' depends on the significance of the research subjects that could not be addressed if the two fields remained separated. Situations characterized by a scarcity of overt operator behaviour and performance represent one driving force for combining the two fields. In those situations, neurobiological indices of cognitive processes and capacities may emerge as the main, or even exclusive, source of information about the operator's cognitive status and activities. This information is needed, for example, to support adaptive aiding and dynamic function allocation in the context of human-automation cooperation. The utilization of research approaches and measurements more typical of cognitive neuroscience will benefit the field of cognitive ergonomics to the extent that multidimensional psychological constructs (such as situation awareness and mental workload) are reduced to their underlying cognitive operations which are more isomorphic with activity changes in brain regions, circuits and distributed neuronal systems. The transformation of these constructs and paradigms will, in turn, enable cognitive ergonomics to contribute to progress in the field of cognitive neuroscience.

Differentiation of deception using pupillary responses as an index of cognitive processing

The deception literature has predominantly focused on detection of guilty individuals using electrodermal measures. Little research has examined other psychophysiological measures or the mechanisms underlying deception. Therefore, the present study examined pupillary responses in a differentiation-of-deception paradigm. Twenty-four undergraduate participants answered the same questions twice, once truthfully and once deceptively, while pupillary responses were recorded. Questions were based on recently learned (episodic) information from scenarios or on general (semantic) knowledge from long-term memory. Task-evoked pupil dilation was significantly greater when participants confabulated responses than when they told the truth for both episodic and semantic memory questions. Previous research has demonstrated that pupil size increases with increased cognitive processing load. The present study suggested that generating deceptive recall was associated with increased pupil size and required greater cognitive processing than truthful recall.

Differentiation of deception using pupillary responses as an index of cognitive processing

Differentiation of deception using pupillary responses as an index of cognitive processing

MEG gamma band activity in schizophrenia patients and healthy subjects in a mental arithmetic task and at rest

Objectives: High frequency oscillations have been suggested as a correlate of cognitive processes and have recently also been implicated in aberrant forms of information processing. The present study investigated whether magnetoencephalographic (MEG) gamma band activity (20–71 Hz) can serve as an index of cognitive processes in the absence of external stimulation and to what extent gamma activity differs between healthy people and schizophrenia patients. Methods: The amount and topography of MEG power in the gamma band range was examined in 15 schizophrenia patients and 15 healthy comparison subjects while performing a complex mental arithmetic task and at rest. Results: In healthy subjects a left frontal and left fronto-temporal increase in gamma power was observed during mental arithmetic. Schizophrenia patients either failed to display such a task effect (30–45 Hz) or had reversed lateralization with enhanced activity over right frontal and right fronto-temporal regions under cognitive demands (45–71 Hz). In the frequency band from 60 to 71 Hz patients showed less gamma at fronto-temporal, posterio-temporal and occipital sites irrespective of the task. Conclusions: These results indicate, first, that gamma topography can index cognitive activation in a very complex and purely internal task. Second, groups differed in the pattern of activation during the task, a result which may be consistent with working memory dysfunction in schizophrenia. Third, the general topographic difference between healthy subjects and patients is in line with the notion of abnormalities in the thalamocortical circuit in schizophrenia.

The Predictive Validity of Eye Movement Indices for Technical School Qualifying Test Performance

The study was designed to determine the predic tive validity of a series of eye scan indices, collected during analogical reasoning, with respect to techni cal school qualifying test performance. The scan patterns of 11 male Navy recruits were recorded during solution of 12 items taken from the 1962 Advanced Progressive Matrices. Significant positive relationships with performance on the Armed For ces Qualifying Test were identified for (1) the per centage of the total number of fixations occurring within the main stimulus array prior to the first ex cursion to the distractor field; (2) the proportion of total row scans to binary row scans; and (3) the proportion of total column scans to binary column scans. Significant negative relationships with quali fying test performance were identified for (1) the number of excursions from a point in the stimulus array to a point in the distractor field and (2) the total number of fixations. Results are discussed within the framework of employing indices of cog nitive processes to develop selection and training procedures from an individual differences perspec tive.