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PubMed1990

Time courses in visual-information processing: some empirical evidence for inhibition.

In the literature two different views on the time course of activation of "recognition units"--hypothetical units that represent identity information--are proposed. The first view assumes that the recognition units accumulate activation gradually over time. The second assumes that the activation levels increase fast initially and then start to decrease. Hagenzieker and Van der Heijden (1990) have proposed a more general information-processing model, which is compatible with both views. In this model a threshold determines what type of time course will be obtained. For below-threshold-activation values a gradual accumulation of activation will be found; for above-threshold values activation levels will first increase and then, because of inhibition, decrease. This model served as a starting-point for the present paper. Elaboration of this model led to two testable hypotheses with regard to identification performance. The first prediction is that evidence for inhibition should be observed only under relatively bright luminance conditions. The second is that, given inhibition, the amount of the effect of this inhibition should increase over time. A partial-report bar-probe task was used to test the predictions. The experiment involved two luminance conditions and the information was sampled at two different moments in time. To control for possible localization artefacts a digit-naming task was also used. Evidence for inhibition was found in both luminance conditions. In accordance with the model the amount of the effect of inhibition increased over time.

Adult↗
PubMed2000

Time evolution of acoustic 'information' processing in the mesencephalon of Wistar rats.

A traditional analysis of intra-encephalic auditory evoked potentials does not highlight the dynamical evolution of the auditory 'information' processing in neither time nor space. This work presents a method for tracing such signal evolution throughout the primary auditory pathway in the mesencephalon of adult anesthetized Wistar rats, using a unilateral 3 kHz tone burst stimulus. The results of the acoustic evoked potentials mapping are presented as conventional 20 ms recordings and re-analyzed in intervals of 1 ms-time windows. The parameter used, as an 'activity' correlate, was the maximum/minimum voltage difference obtained from each time window. The methodology used clearly indicates sequential signal propagation from the dorsal and ventral nuclei of the lateral lemniscus up to the inferior colliculus.

Acoustic Stimulation↗
PubMed2005

Information-processing biases in young adults from bereaved and divorced families.

Parental loss or divorce is associated with increased risk for affective disorders, potentially because of dysfunctional information processing. This study evaluated attentional biases to threat or loss-related cues in young adults from divorced, parental-loss, or intact families. Participants from intact families showed avoidance of supraliminal threat and loss cues, whereas those from divorced families showed vigilance toward loss cues. Those from bereaved families showed no pattern of bias. Abuse and poor family relationships were associated independently with vigilance toward negative cues. After controlling for abuse, group differences in threat bias were no longer apparent. Results suggest that parental death or divorce may increase risk of affective disorder owing to the loss of a "protective bias" away from negative stimuli.

Adult↗
PubMed2002

The MBTI and social information processing: an incremental validity study.

The ability of the Myers-Briggs Type Indicator (MBTI; Myers & McCaulley, 1985) to predict performance on social cognitive tasks tapping information processing effort was assessed. Judgment and intuition interacted to predict amount of attributional adjustment on a dispositional attribution task. The MBTI scales predicted processing above and beyond measures of the five factors, rational-experiential preferences, and causal uncertainty. The relevance of these results for interpretation of the MBTI indexes is discussed.

Adult↗
PubMed1993

Alcohol and aggression: a social information processing analysis.

The present study represents a preliminary exploration of the effects of alcohol on aggression (a hypothetical response to a videotaped provocation), using a social information processing model. Subjects were male social drinkers who received either a control beverage (ginger ale), placebo, .45 g/kg alcohol or .85 g/kg alcohol. Subjects observed a series of videotaped scenes of potential conflict occurring in the lounge of a college dormitory. In these scenes, an intruder switched the channel on a television set without asking the person watching for permission. The four groups were similar in their ability to encode and interpret social cues. Subjects in the 0.85 g/kg group were less able to generate competent (nonaggressive) solutions and were less likely than controls to select adaptive (nonaggressive) solutions. Subjects in the .85 g/kg group were more likely than control subjects to respond aggressively after being frustrated by the intruder's negative reaction to the initial attempt to resolve the conflict.

Adult↗
PubMedDate not supplied

Event-related potential measurement of deficits in information processing following moderate to severe closed head injury.

Event-related potentials may offer more precision than behavioural measures for understanding the extent and timing of information processing difficulties that follow closed head injury (CHI). Behavioural tests consistently indicate a general reduction in cognitive function but lack adequate diagnostic or prognostic function. This study compares a group of seven CHI patients, in which time since injury varied between 1 and 5 years following injury, with 10 matched controls on a three-tone discrimination task. Abnormality in the processing of tones as early as 200 ms following their onset, as measured by the P2 and N2 components of the event-related potential, indicated a general difficulty with tone discrimination. This abnormality was obtained despite differing damage profiles over patients and is likely to be due to the diffuse aspects of damage normal in CHI. These results also indicate that functional deficits in CHI patients can extend up to 5 years or more. A correlation between P2/N2 amplitudes and time since injury, however, suggests that both these components normalize with the passage of time and offers the prospect of a sensitive, non-behavioural measure of recovery in cognitive processing.

Adolescent↗
PubMed1992

Infant information processing in relation to six-year cognitive outcomes.

As part of a longitudinal follow-up of full-terms and preterms, infant measures of information processing obtained at 7 months and 1 year were related to various 6-year outcomes: general intelligence, language proficiency, early reading and quantitative skills, and several facets of perceptual organization (N = 91). 7-month Visual recognition memory (VRM) was associated with 6-year performance in all domains, and 3 1-year measures--VRM, cross-modal transfer (CMT), and object permanence--were related to IQ and/or one or more specific outcomes (r's = .20 to .47). Many of the infant-childhood relations remain significant even with IQ partialed. Additionally, 7-month VRM and 1-year CMT scores were lower for infants who, at 6 years, were considered at risk for learning disabilities. Overall, measures from the first year of life predicted both specific cognitive abilities and IQ at 6 years; to some extent, the specific abilities were predicted independently of IQ.

Achievement↗
PubMed2004

The Adjusting-Paced Serial Addition Test (Adjusting-PSAT): thresholds for speed of information processing as a function of stimulus modality and problem complexity.

A modified computer version of the PASAT (Adjusting-PSAT; ) is described that measures speed of information processing and working memory by means of a temporal threshold rather than number of correct responses. This is accomplished by making the duration of the interval between numbers depend on the correctness of responding-a correct response decreases the interval between digits and an incorrect response increases the interval. Modality of presentation (visual and auditory) was factorially combined with problem difficulty (answers between 2-10 or 2-18). Performance of 60 healthy student volunteers on the Adjusting-PSAT was compared to that obtained on several traditional neuropsychological measures (Digit Span, Trail Making Test, and Symbol Digit Modality Test) and on a test of basic addition skills. The visual version of the test produced a lower threshold than did the auditory version, but problem difficulty did not produce a significant effect. Of the neuropsychological tests, Trails-B (TMT-B) was most highly correlated with thresholds. However, regression analyses revealed that math ability accounted for more variance than did TMT-B. The clinical implications of these finding are discussed.

Acoustic Stimulation↗
PubMed1991

[Sensory information processing during general anesthesia-- acoustic-evoked 30-40 Hz oscillations and intraoperative wakefulness during cesarean section].

Neuropsychological and neurophysiological investigations indicate that the underlying framework of adequate sensory information processing is a 30-40 Hz oscillatory brain mechanism, which also can be observed in mid-latency auditory evoked potentials (MLA-EP). Since high incidence of stimuli perception and wakefulness is a phenomenon during Caesarean section under general anaesthesia it was studied if auditory evoked 30-40 Hz oscillation correlate with intraoperative wakefulness during this surgical procedure. Following informed consent, 21 patients were selected for elective Caesarean section. Anaesthesia was induced with thiopentone (5 mg/kg b.w. i.v.) and maintained with thiopentone bolus injection (1-2 mg/kg b.w.i.v). and O2/N2O 1:1 according to clinical signs of adequate anaesthesia. After delivery, a balanced anaesthetic technique using fentanyl, enflurane and N2O in O2 1:1 was employed. Clinical signs of intraoperative wakefulness were spontaneous movements of the limbs, mimics, eye-opening, wakefulness after auditory stimulation (tape A: crying baby, tape B: classical music), one hour and 24 hours postoperatively reported dreams, hallucinations and detailed reports about intraoperative events. Auditory evoked potentials were recorded on-line before and during general anaesthesia, during the entire surgical procedure. Latencies of the peaks V, Na, Pa were measured. Employing Fast-Fourier transformation analysis, corresponding power spectra were calculated to analyse energy portions of AEP's frequency components. Spontaneous motoric movements occurred in 60% of the patients and did not correlate with heart rate, blood pressure or other clinical signs of inadequate anaesthesia. Provoked motoric reactions were 4 times as often after presentation of tape A as after tape B.(ABSTRACT TRUNCATED AT 250 WORDS)

Acoustic Stimulation↗
PubMed1986

Psychophysiological reactivity in type A and B women during a rapid information processing task.

Type A and Type B women assessed by a newly developed German questionnaire 'need for control' (NC) were compared with respect to time-pressured information processing performance and to simultaneously recorded psychophysiological reactivity. The task was computer controlled, monetarily reinforced and subject paced. The physiological measurements included the cardiovascular parameters, ECG and finger plethysmographic amplitudes and the noncardiovascular parameters, EMG (frontal muscle), skin conductance reactivity, and respiration. NC-Type A and Type B women did not differ in performance, but the Type As showed stronger vasoconstrictive responses to the task than did the Type Bs. Other physiological intergroup differences were not seen. In addition, the Type As scored significantly higher in nervousness and irritability and marginally higher in depression, reactive aggressivity and neuroticism than did the Type Bs. This particular pattern of NC-Type A/B differences is discussed with regard to relevant differences observed by other studies between SI and JAS Type As and Bs.

Adult↗
PubMed1994

Information-processing abnormalities as neuropsychological vulnerability indicators for schizophrenia.

Studies of schizophrenic patients in psychotic and clinically remitted states and of biological relatives indicate that subtle anomalies in information processing may be critical components of neuropsychological vulnerability to schizophrenia. We describe a conception of possible abnormalities and several recent strategies to differentiate these possibilities. Within Continuous Performance Test conditions, varying the perceptual load vs. the active, working memory load yields a distinction between a stable vulnerability factor across clinical states and a potential mediating vulnerability factor. Specialized backward masking paradigms offer ways to separate two initial sensory-perceptual processes from attentional shifting processes. Top-down attentional influences on sensorimotor gating allow examination of the role of central executive processes in modulating early sensory processes. Initial results are discussed.

Adolescent↗
PubMed1989

Age and creative productivity: nonlinear estimation of an information-processing model.

A two-step cognitive model is outlined that explicates the key empirical findings on the relation between age and creative productivity. Two primary information-processing parameters, the ideation and elaboration rates, define a mathematical function that both describes the age curves and specifies how those curves vary across disciplines. To validate the model further, a nonlinear estimation program was applied to previously published tabulations on the longitudinal fluctuations in creative output. The resulting parameter estimates also yield the expected peak age and the creative half-life for each domain of achievement. Despite the prediction of a post-peak decline, the model's implications for creativity over the life span are optimistic.

Adult↗
PubMed2005

Capacity limits of information processing in the brain.

Despite the impressive complexity and processing power of the human brain, it is severely capacity limited. Behavioral research has highlighted three major bottlenecks of information processing that can cripple our ability to consciously perceive, hold in mind, and act upon the visual world, illustrated by the attentional blink (AB), visual short-term memory (VSTM), and psychological refractory period (PRP) phenomena, respectively. A review of the neurobiological literature suggests that the capacity limit of VSTM storage is primarily localized to the posterior parietal and occipital cortex, whereas the AB and PRP are associated with partly overlapping fronto-parietal networks. The convergence of these two networks in the lateral frontal cortex points to this brain region as a putative neural locus of a common processing bottleneck for perception and action.

Attention↗
PubMed2001

Adult age differences in self-ordered pointing task performance: contributions from working memory, executive function and speed of information processing.

This study investigated adult age differences in, and predictors of, the performance of a test of executive function, the Self-Ordered Pointing Task (SOPT; Petrides & Milner, 1982). Performance on the SOPT is thought to rely on high level working memory processes, therefore, measures reflecting the common operationalization of working memory, along with measures of executive function and speed of information processing, were investigated as predictors of SOPT performance. Younger (aged 17-48 years) and older (aged 65-88 years) adults completed a 16-item, 3-trial, modified version of Shimamura and Jurica's (1994) version of the SOPT, and tests assessing working memory, executive function and speed. Results showed that younger adults made fewer errors on the SOPT. There was no age difference in the frequency of use of a clustering strategy. Contrary to expectations, working memory was not a good predictor of individual or age differences in SOPT performance. Instead, speed of processing, and to a lesser extent, measures of perseverations, made larger unique and overlapping contributions to the variance. The SOPT and its association, or dissociation, with other measures of working memory may be useful for research into the nature of working memory and executive function and the theoretical links between them.

Adolescent↗
PubMed1994

Auditory information processing in sleep: habituation to repetitive stimuli.

Habituation to evoked responses is obvious in waking but still controversial in sleep. Single-response analysis proves short-term habituation of auditory evoked potentials in stage 2 NREM sleep. The data are discussed referring to the two-system hypothesis of sensory processing in sleep and to DC instability and sleep maintenance mechanisms in stage 2 NREM. It is suggested that information processing might continue in sleep.

Adult↗
PubMed1985

Early visual information processing in depressive patients treated with ORG 2766 (an ACTH 4-9 analogue).

Twenty-one depressive patients (7 males, 14 females, mean age 61.6, range 50-72) participated in an inter- and intraindividual double-blind comparative study between the ACTH 4-9 analogue (ORG 2766), 80 mg daily during 14-28 days, and placebo. The temporal thresholds for detection and recognition of rapidly presented single letters were assessed by a tachistoscopic technique. The results indicate that the peptide has a reducing effect on recognition threshold, and appears to improve automatic, preattentive levels of information processing possibly involved in the transfer of information from the peripheral icon to the cortical centre, i.e. from iconic storage to short-term memory.

Adrenocorticotropic Hormone↗
PubMed1998

Effects of cotinine on information processing in nonsmokers.

Cotinine, the major proximate metabolite of nicotine, is present in smokers in higher concentrations and for a longer time than nicotine, yet its effects on information processing have not previously been reported. We studied the cognitive effects of cotinine in non-smokers. Sixteen subjects were tested on three doses of cotinine (0.5, 1.0, and 1.5 mg cotinine base/kg), and placebo, on a choice reaction time (RT) task and on a verbal recall task with short and long lists. Cotinine significantly impaired recall on the long list and displayed non-significant but generally consistent dose-related slowing of RT and N100 latency. The acute effects of cotinine were small, and probably do not account for the cognitive deficits observed in tobacco withdrawal, although the cognitive effects of chronic cotinine administration need to be investigated.

Adult↗
PubMed1996

Heterogeneity of information-processing alterations according to dimensions of depression: an event-related potentials study.

To identify alterations in elementary cognitive operations according to dimensions of depression, two stages of information processing, namely the response choice and the motor preparation stages, were explored using an event-related potential paradigm in two subgroups of depressed patients (retarded and blunted affect versus anxious-agitated and impulsive) compared to controls. Two results are common to all depressed patients: a slow encoding of stimuli (P1 wave) and a prolonged processing of stimulus-response compatibility (after P3b). This is compensated by a global velocity increase in stimulus evaluation or decision making (P3b) in anxious-agitated patients or, on the contrary, cumulated with its velocity decrease in retarded-blunted-affect patients. Such results could provide an explanation for the massive retardation observed in blunted-affect patients, contrary to anxious-agitated patients, whose normal reaction times may come from a very high energetical involvement at the P3b level. Results as a whole suggest that impairments in blunted-affect patients concern effort mechanisms, whereas those in anxious-agitated patients concern perceptual processes.

Adult↗