scholarly journals Reaction time in relation to duration of heroin abuse

2011 ◽  
Vol 139 (1-2) ◽  
pp. 69-75
Author(s):  
Sladjana Martinovic-Mitrovic ◽  
Aleksandra Dickov ◽  
Dragan Mitrovic ◽  
Veselin Dickov ◽  
Mirjana Jovanovic ◽  
...  
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Auditory Task ◽  
Visual Signal ◽  
Visual Modality ◽  
Auditory Modality ◽  
The Third ◽  
Heroin Abuse ◽  
Significant Prolongation ◽  
Visual Sign

Introduction. Consequences of heroin abuse include organic damage of cerebral structures. The level of impairments is in a direct and positive relation with the length of heroin abuse. Objective. The aim of this research was the evaluation of the reaction time with heroin addicts with different length of substance abuse. Methods. Research method: 90 examinees were divided into three groups with relation to the length of heroin abuse. Data collection included a questionnaire referring to socio-demographic and addictive characteristics. A specially designed programme was used for the evaluation of reaction time to audio/ visual signal. Results. In relation to the reaction time as overall model, the difference between examinees with different length of heroin abuse can be found on the marginal level of significance (F=1.69; df=12; p=0.07). In visual modality, with the increase of length of heroin abuse leads to a significant prolongation of simple (the first visual sign: F=3.29; df=2; p=0.04) and choice reaction time (the second visual sign: F=4.97; df=2; p=0.00; the third visual sign: F=3.08; df=2; p=0.05). Longer heroin consumption also leads to the prolongation of the simple (the first auditory task: F=3.41; df=2; p=0.04) and the complex auditory reaction time (the second auditory task: F=5.67; df=2; p=0.01; the third auditory task: F=6.42; df=2; p=0.00). Conclusion. Heroin abuse leads to the prolongation of both simple and choice reaction time in visual as well as auditory modality. The average daily dose of opiates was the most important predictor of the abovementioned cognitive dysfunction.

Decisions concerning the Rejected Channel

1966 ◽  
Vol 18 (3) ◽  
pp. 260-265 ◽  
Author(s):  
Everdina A. Lawson
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Simple Reaction Time ◽  
Reaction Times ◽  
False Positives ◽  
Auditory Stimuli ◽  
Simple Reaction ◽  
The Third ◽  
Verbal Messages

It was thought that the physical aspects of auditory stimuli were possibly transmitted via separate pathways from those transmitting the verbal aspects. Three experiments were designed to test this hypothesis. In these experiments subjects had to perform a shadowing task and had to respond simultaneously on response keys to pips superimposed in either ear on verbal messages. The response to these pips was of increasing complexity, in that it was a simple reaction time which was measured in the first experiment, a choice reaction time in the second experiment and a more complex choice reaction time in the third experiment. Subjects were able to perform these tests although the increasing difficulty was reflected in longer reaction times and more errors. The reaction times to the pips presented to the ear which was not being shadowed were slower, and the errors, made to pips in both channels, were “false positives” rather than errors of omission. These results were taken as favouring the hypothesis.

scholarly journals Altered Inhibitory Mechanisms in Parkinson’s Disease: Evidence From Lexical Decision and Simple Reaction Time Tasks

2021 ◽  
Vol 15 ◽  
Author(s):  
Alban Letanneux ◽  
Jean-Luc Velay ◽  
François Viallet ◽  
Serge Pinto
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Reaction Time ◽  
Lexical Decision ◽  
Simple Reaction Time ◽  
Mental Lexicon ◽  
Visual Modality ◽  
Auditory Modality ◽  
Control Task ◽  
Simple Reaction

IntroductionAlthough the motor signs of Parkinson’s disease (PD) are well defined, nonmotor symptoms, including higher-level language deficits, have also been shown to be frequent in patients with PD. In the present study, we used a lexical decision task (LDT) to find out whether access to the mental lexicon is impaired in patients with PD, and whether task performance is affected by bradykinesia.Materials and MethodsParticipants were 34 nondemented patients with PD, either without (off) medication (n = 16) or under optimum (on) medication (n = 18). A total of 19 age-matched control volunteers were also recruited. We recorded reaction times (RTs) to the LDT and a simple RT (control) task. In each task, stimuli were either visual or auditory. Statistical analyses consisted of repeated-measures analyses of variance and Tukey’s HSD post hoc tests.ResultsIn the LDT, participants with PD both off and on medication exhibited intact access to the mental lexicon in both modalities. In the visual modality, patients off medication were just as fast as controls when identifying real words, but slower when identifying pseudowords. In the visual modality of the control task, RTs for pseudowords were significantly longer for PD patients off medication than for controls, revealing an unexpected but significant lexicality effect in patients that was not observed in the auditory modality. Performances of patients on medication did not differ from those of age-matched controls.DiscussionMotor execution was not slowed in patients with PD either off or on medication, in comparison with controls. Regarding lexical access, patients off medication seemed to (1) have difficulty inhibiting a cognitive-linguistic process (i.e., reading) when it was not required (simple reaction time task), and (2) exhibit a specific pseudoword processing deficit in the LDT, which may have been related to impaired lateral word inhibition within the mental lexicon. These deficits seemed to be compensated by medication.

Auditory Conflict Processing: Behavioral and Electrophysiologic Manifestations of the Stroop Effect

2010 ◽  
Vol 21 (07) ◽  
pp. 474-486 ◽  
Author(s):  
Yael Henkin ◽  
Yifat Yaar-Soffer ◽  
Shlomo Gilat ◽  
Chava Muchnik
Keyword(s):  
Reaction Time ◽  
Stroop Effect ◽  
Response Selection ◽  
Word Meaning ◽  
Visual Modality ◽  
Auditory Modality ◽  
Conflict Processing ◽  
Performance Accuracy ◽  
Related Potentials ◽  
Stroop Effects

Background: One of the most extensively studied phenomena in cognitive neuroscience is the Stroop effect. In an enormous corpus of literature, the Stroop task has been used to study conflict processing in the visual modality; however, scarce data exist in the auditory modality. Purpose: The main goal of the present study was to investigate auditory conflict processing by means of behavioral and electrophysiologic measures elicited during standard and reversed Stroop tasks. A secondary goal was to examine practice-related effects. Research Design: Event-related potentials (ERPs) were recorded from 16 adults during tasks requiring classification of word meaning or speaker's gender while ignoring the irrelevant (congruent or incongruent) speaker's gender or word meaning, respectively. The behavioral measures, reaction time and performance accuracy, were simultaneously obtained. Results: Results indicated (1) a significant behavioral Stroop effect manifested by prolonged reaction time and reduced performance accuracy. In contrast, ERP latencies were unaffected by the processing of incongruent versus congruent stimuli, supporting postperceptual conflict processing associated with response selection and execution; (2) reduced N1 amplitude while processing incongruent versus congruent stimuli; (3) similar behavioral Stroop effects in both tasks together with nonsignificant task by stimulus type (incongruent, congruent) interactions for N1 and N4; (4) significantly prolonged N4 and reaction time together with reduced N1 amplitude in the speaker's gender task (to both congruent and incongruent stimuli) compared to those found in the word meaning task; and (5) practice-related improvement in processing efficacy based on enhanced N1 amplitude, as well as shorter N4 and reaction time. Conclusions: Auditory conflict processing was predominantly postperceptual and was located at the response selection and execution stages. Alterations in the N1 component, however, provided support for an auditory conflict-processing “signature” at the initial stages of the arrival of information to the auditory cortex. The current data indicate that speaker's gender and word meaning intruded on one another in a similar fashion, supporting symmetry between standard and reversed auditory Stroop effects. Nonetheless, improved processing efficacy was evident while classifying word meaning. Utilization of the present methodology may prove advantageous for studying clinical populations exhibiting auditory and/or linguistic processing deficits.

Information Processing in a Binary Classification Task

1979 ◽  
Vol 48 (3) ◽  
pp. 851-861 ◽  
Author(s):  
Cephas J. Adkins ◽  
Ben B. Morgan ◽  
Earl A. Alluisi
Keyword(s):  
Information Processing ◽  
Visual Search ◽  
Reaction Time ◽  
Choice Reaction Time ◽  
Display Size ◽  
Binary Classification ◽  
Limited Capacity ◽  
The Third ◽  
Search Tasks ◽  
Within Subjects

Three choice-reaction time studies were conducted to investigate whether information processing is exhaustive or self-terminating, serial or parallel, and N-dependent or N-independent. A total of 54 subjects were requited to make key-pressing responses to one, two, or three digits presented in a circular display; one key was pressed if the display contained one or more target digits and another key was pressed if the display contained only nontarget digits. The first two studies utilized within-subjects designs in which the displays were consttucted from only one target and one nontarget item (Study 1) or from three target and seven nontarget items (Study 2). The third study used a between-subjects design in which different groups of subjects responded to one-, two-, or three-element displays. In general, the results indicate that CRTs increased as the total number of display elements increased and decreased as the number of target elements (or the ratio of target to nontarget items) increased for a given display size. When only target elements were presented, CRT was independent of the number of elements displayed, and when only one target was presented, CRT increased as total number of elements increased. These combined results are interpreted as support for the inference that information processing in visual search tasks tends to be self-terminating, serial, and N-dependent (of limited capacity).

Is the Future the Right Time?

2010 ◽  
Vol 57 (4) ◽  
pp. 308-314 ◽  
Author(s):  
Marc Ouellet ◽  
Julio Santiago ◽  
Ziv Israeli ◽  
Shai Gabay
Keyword(s):  
Auditory Task ◽  
English Speakers ◽  
Visual Modality ◽  
Opposite Pattern ◽  
Time Line ◽  
Temporal Reference ◽  
Left Hand ◽  
Reading Direction ◽  
Mental Time Line ◽  
The Right

Spanish and English speakers tend to conceptualize time as running from left to right along a mental line. Previous research suggests that this representational strategy arises from the participants’ exposure to a left-to-right writing system. However, direct evidence supporting this assertion suffers from several limitations and relies only on the visual modality. This study subjected to a direct test the reading hypothesis using an auditory task. Participants from two groups (Spanish and Hebrew) differing in the directionality of their orthographic system had to discriminate temporal reference (past or future) of verbs and adverbs (referring to either past or future) auditorily presented to either the left or right ear by pressing a left or a right key. Spanish participants were faster responding to past words with the left hand and to future words with the right hand, whereas Hebrew participants showed the opposite pattern. Our results demonstrate that the left-right mapping of time is not restricted to the visual modality and that the direction of reading accounts for the preferred directionality of the mental time line. These results are discussed in the context of a possible mechanism underlying the effects of reading direction on highly abstract conceptual representations.

scholarly journals The molecular footprints of COVID-19

2020 ◽  
Vol 45 (3) ◽  
pp. 241-248
Author(s):  
Engin Yilmaz ◽  
Yakut Akyön ◽  
Muhittin Serdar
Keyword(s):  
Reaction Time ◽  
Changing Environment ◽  
The Third ◽  
The Past ◽  
The People ◽  
The World ◽  
The Future ◽  
Host Virus Interactions ◽  
Virus Interactions

AbstractCOVID-19 is the third spread of animal coronavirus over the past two decades, resulting in a major epidemic in humans after SARS and MERS. COVID-19 is responsible of the biggest biological earthquake in the world. In the global fight against COVID-19 some serious mistakes have been done like, the countries’ misguided attempts to protect their economies, lack of international co-operation. These mistakes that the people had done in previous deadly outbreaks. The result has been a greater economic devastation and the collapse of national and international trust for all. In this constantly changing environment, if we have a better understanding of the host-virus interactions than we can be more prepared to the future deadly outbreaks. When encountered with a disease which the causative is unknown, the reaction time and the precautions that should be taken matters a great deal. In this review we aimed to reveal the molecular footprints of COVID-19 scientifically and to get an understanding of the pandemia. This review might be a highlight to the possible outbreaks.

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