Evoked potentials and simple motor reaction times to localized visual patterns

1993 ◽  
Vol 33 (10) ◽  
pp. 1325-1337 ◽  
Author(s):  
Richard C. Hartwell ◽  
Jack D. Cowan
Keyword(s):  
Evoked Potentials ◽  
Reaction Times ◽  
Motor Reaction ◽  
Visual Patterns ◽  
Simple Motor

scholarly journals Comparative analysis of reactions to visual and auditory stimuli in research on EEG evoked potentials

2018 ◽  
Vol 7 ◽  
pp. 172-177
Author(s):  
Łukasz Tyburcy ◽  
Małgorzata Plechawska-Wójcik
Keyword(s):  
Comparative Analysis ◽  
Evoked Potentials ◽  
Auditory Stimulus ◽  
Visual Stimulus ◽  
Visual Stimuli ◽  
Reaction Times ◽  
Auditory Stimuli

The paper describes results of comparison of reactions times to visual and auditory stimuli using EEG evoked potentials. Two experiments were used to applied. The first one explored reaction times to visual stimulus and the second one to auditory stimulus. After conducting an analysis of data, received results enable determining that visual stimuli evoke faster reactions than auditory stimuli.

A New Apparatus for measuring Sensori-motor Reaction Times.

1923 ◽  
Vol 16 (Electro_Ther) ◽  
pp. 63-70
Author(s):  
M. D. Hart ◽  
W. Whately Smith
Keyword(s):  
Reaction Times ◽  
Motor Reaction ◽  
New Apparatus

VEP latency and some properties of simple motor reaction-time distribution

1990 ◽  
Vol 52 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Piotr Jaśkowski ◽  
Antoni Pruszewicz ◽  
Piotr Świdzinski
Keyword(s):  
Reaction Time ◽  
Time Distribution ◽  
Reaction Time Distribution ◽  
Motor Reaction ◽  
Motor Reaction Time ◽  
Simple Motor ◽  
Vep Latency

Functional Locus of Intensity Effects in Choice Reaction Time Tasks

2009 ◽  
Vol 23 (3) ◽  
pp. 126-134 ◽  
Author(s):  
Piotr Jaśkowski ◽  
Izabela Szumska ◽  
Edyta Sasin
Keyword(s):  
Reaction Time ◽  
Evoked Potentials ◽  
Response Selection ◽  
Visual Stimuli ◽  
Reaction Times ◽  
Auditory Stimuli ◽  
Response Choice ◽  
Selection Processes ◽  
Functional Locus ◽  
Readiness Potentials

Long reaction times (RT) paradoxically occur with extremely loud auditory stimuli ( Van der Molen & Keuss, 1979 , 1981 ) or with ultrabright and large visual stimuli ( Jaśkowski & Włodarczyk, 2006 ) when the task requires a response choice. Van der Molen and Keuss (1981 ) hypothesized that this effect results from an arousal-driven elongation of response-selection processes. We tested this hypothesis using visual stimuli and chronopsychophysiological markers. The results showed that the latency of both early (P1 recorded at Oz) and late (P300) evoked potentials decreased monotonically with intensity. In contrast, the latency of stimulus-locked lateralized readiness potentials (LRP) abruptly increased for the most intense stimuli, thus mirroring the reaction time–intensity relationship. Response-locked LRPs revealed no dependency on intensity. These findings suggest that the processes responsible for the van der Molen-Keuss effect influence processing stages that are completed before the onset of LRP. The van der Molen-Keuss effect likely occurs later than those represented by early sensory potentials. This is in keeping with the hypothesis of van der Molen-Keuss.

Effects of certainty, modality shift and guess outcome on evoked potentials and reaction times in chronic schizophrenics

1978 ◽  
Vol 8 (1) ◽  
pp. 81-93 ◽  
Author(s):  
Rolf Verleger ◽  
Rudolf Cohen
Keyword(s):  
Reaction Time ◽  
Evoked Potentials ◽  
Reaction Times ◽  
Random Order ◽  
Verbal Information ◽  
Group Interactions ◽  
Chronic Schizophrenics ◽  
Modality Shift ◽  
Normal Controls

SynopsisEvoked potentials and reaction times were obtained from chronic schizophrenics and normal controls to light and sound stimuli presented in random order. In the ‘ certain’ condition subjects were told what the next stimulus would be, in the ‘uncertain’ condition they were asked to guess. Amplitudes were usually larger for normals than for schizophrenics, for ‘uncertain’ than for ‘certain’ conditions, and in cross- than in ipsimodal stimulus-sequences. The effect of certainty was stronger in normals across 4 leads; so was the effect of modality shift at vertex. While these findings replicate earlier results from acute schizophrenics, no condition x group interactions could be found in the reaction time measures.Two additional results were interpreted as showing basically different attitudes with respect to the predictability of events: (1) there was a slow positivity between the verbal information and the following stimuli which was largest for schizophrenics in the conditions of certainty; (2) while normals showed long-term habituation only in N1- but not in P3-amplitudes, the reverse was true for schizophrenics.

Sign in / Sign up

Export Citation Format

Share Document