scholarly journals Heterogeneity in semantic priming effect with a lexical decision task in patients after left hemisphere stroke

2016 ◽  
Vol 10 (2) ◽  
pp. 91-97
Author(s):  
Candice Steffen Holderbaum ◽  
Letícia Lessa Mansur ◽  
Jerusa Fumagalli de Salles
Keyword(s):  
Lexical Decision ◽  
Lexical Decision Task ◽  
Left Hemisphere ◽  
Semantic Priming ◽  
Priming Effect ◽  
Stimulus Onset ◽  
Decision Task ◽  
Semantic Priming Effect ◽  
And Performance ◽  
Left Hemisphere Stroke

ABSTRACT Investigations on the semantic priming effect (SPE) in patients after left hemisphere (LH) lesions have shown disparities that may be explained by the variability in performance found among patients. The aim of the present study was to verify the existence of subgroups of patients after LH stroke by searching for dissociations between performance on the lexical decision task based on the semantic priming paradigm and performance on direct memory, semantic association and language tasks. All 17 patients with LH lesions after stroke (ten non-fluent aphasics and seven non aphasics) were analyzed individually. Results indicated the presence of three groups of patients according to SPE: one exhibiting SPE at both stimulus onset asynchronies (SOAs), one with SPE only at long SOA, and another, larger group with no SPE.

scholarly journals The Mechanism Underlying Backward Priming in a Lexical Decision Task: Spreading Activation versus Semantic Matching

1998 ◽  
Vol 51 (3) ◽  
pp. 531-560 ◽  
Author(s):  
Dorothee J. Chwilla ◽  
Peter Hagoort ◽  
C.M. Brown
Keyword(s):  
Reaction Time ◽  
Lexical Decision ◽  
Lexical Decision Task ◽  
Semantic Priming ◽  
Priming Effect ◽  
Decision Task ◽  
Spreading Activation ◽  
Semantic Matching ◽  
Priming Effects ◽  
Manipulation Experiment

Koriat (1981) demonstrated that an association from the target to a preceding prime, in the absence of an association from the prime to the target, facilitates lexical decision and referred to this effect as “backward priming”. Backward priming is of relevance, because it can provide information about the mechanism underlying semantic priming effects. Following Neely (1991), we distinguish three mechanisms of priming: spreading activation, expectancy, and semantic matching/ integration. The goal was to determine which of these mechanisms causes backward priming, by assessing effects of backward priming on a language-relevant ERP component, the N400, and reaction time (RT). Based on previous work, we propose that the N400 priming effect reflects expectancy and semantic matching/ integration, but in contrast with RT does not reflect spreading activation. Experiment 1 shows a backward priming effect that is qualitatively similar for the N400 and RT in a lexical decision task. This effect was not modulated by an ISI manipulation. Experiment 2 clarifies that the N400 backward priming effect reflects genuine changes in N400 amplitude and cannot be ascribed to other factors. We will argue that these backward priming effects cannot be due to expectancy but are best accounted for in terms of semantic matching/integration.

scholarly journals Semantic Priming Effects in a Lexical Decision Task: Comparing third Graders and College Students in two Different Stimulus Onset Asynchronies

2011 ◽  
Vol 14 (2) ◽  
pp. 589-599 ◽  
Author(s):  
Candice Steffen Holderbaum ◽  
Jerusa Fumagalli de Salles
Keyword(s):  
College Students ◽  
Semantic Priming ◽  
Priming Effect ◽  
Stimulus Onset ◽  
Third Graders ◽  
Decision Task ◽  
Priming Effects ◽  
Adult Performance ◽  
Semantic Priming Effect ◽  
Onset Asynchrony

Differences in the semantic priming effect comparing child and adult performance have been found by some studies. However, these differences are not well established, mostly because of the variety of methods used by researchers around the world. One of the main issues concerns the absence of semantic priming effects on children at stimulus onset asynchrony (SOA) smaller than 300ms. The aim of this study was to compare the semantic priming effect between third graders and college students at two different SOAs: 250ms and 500ms. Participants performed lexical decisions to targets which were preceded by semantic related or unrelated primes. Semantic priming effects were found at both SOAs in the third graders' group and in college students. Despite the fact that there was no difference between groups in the magnitude of semantic priming effects when SOA was 250ms, at the 500ms SOA their magnitude was bigger in children, corroborating previous studies. Hypotheses which could explain the presence of semantic priming effects in children's performance when SOA was 250ms are discussed, as well as hypotheses for the larger magnitude of semantic priming effects in children when SOA was 500ms.

An Anxiety-Related Bias in Semantic Activation When Processing Threat/Neutral Homographs

1992 ◽  
Vol 45 (3) ◽  
pp. 503-525 ◽  
Author(s):  
Anne Richards ◽  
Christopher C. French
Keyword(s):  
Lexical Decision ◽  
Lexical Decision Task ◽  
Priming Effect ◽  
Stimulus Onset ◽  
Decision Task ◽  
Spreading Activation ◽  
Semantic Activation ◽  
High Anxiety ◽  
Anxiety Group

Three experiments are reported comparing high and low-trait anxious subjects in terms of their patterns of semantic activation in response to ambiguous primes, with one threat-related and one neutral meaning. Such primes were followed by targets related to either their threat or neutral meaning, or by unrelated targets, in a lexical decision task. Experiments 1 to 3 employed stimulus onset asynchronies (SOAs) of 750 msec, 500 msec, and 1250 msec, respectively. At 500-msec SOA all subjects showed facilitation for both meanings. At 750-msec SOA the only significant priming effect was that for the threat-related meaning in the high-anxiety group, and a similar trend was found at 1250-msec SOA. Consideration of the patterns of priming for targets following ambiguous threat/neutral primes suggest that at the longer SOAs, high-anxiety subjects consciously “lock on” to a threatening interpretation if one has been made available by earlier automatic spreading activation.

scholarly journals Lateralızatıon of Non-Word Processıng in Monolınguals

2020 ◽  
Vol 15 ◽  
pp. 185-190
Author(s):  
Filiz Mergen ◽  
Gulmira Kuruoglu
Keyword(s):  
Lexical Decision ◽  
Lexical Decision Task ◽  
Left Hemisphere ◽  
Word Processing ◽  
Lexical Processing ◽  
Response Times ◽  
Hemispheric Dominance ◽  
Decision Task ◽  
Visual Hemifield ◽  
Overwhelming Evidence

A great bulk of research in the psycholinguistic literature has been dedicated to hemispheric organization of words. An overwhelming evidence suggests that the left hemisphere is primarily responsible for lexical processing. However, non-words, which look similar to real words but lack meaningful associations, is underrepresented in the laterality literature. This study investigated the lateralization of Turkish non-words. Fifty-three Turkish monolinguals performed a lexical decision task in a visual hemifield paradigm. An analysis of their response times revealed left-hemispheric dominance for non-words, adding further support to the literature. The accuracy of their answers, however, were comparable regardless of the field of presentation. The results were discussed in light of the psycholinguistic word processing views.

Lexical decision tasks in depressive patients: semantic priming before and after clinical improvement

2002 ◽  
Vol 17 (2) ◽  
pp. 69-74 ◽  
Author(s):  
C. Besche-Richard ◽  
C. Passerieux ◽  
M.-C. Hardy-Baylé
Keyword(s):  
Lexical Decision ◽  
Lexical Decision Task ◽  
Clinical Improvement ◽  
Semantic Priming ◽  
Rating Scales ◽  
Psychomotor Retardation ◽  
Clinical Population ◽  
Decision Task ◽  
Control Subjects ◽  
Depressive Patients

SummaryThis study was designed to evaluate the effect of semantic priming with a lexical decision task in 22 depressed patients (DSM-III-R, 1987) and 30 control subjects. These patients were evaluated twice: first when they arrived at the hospital, and secondly, after clinical improvement. Clinical improvement was evaluated using standard depression rating scales. A lexical decision task involving semantic relations (related vs. unrelated, e.g., apple-pear) was used to evaluate the processing of semantic information. The results showed that, for the first evaluation, the depressives presented similar semantic priming to control subjects. When we compared semantic priming in the first and the second passes, we observed that its amplitude was identical. The sole difference between the two passes concerns the global reaction time in the depressive group. This last result suggested that, with clinical improvement, the characteristic psychomotor retardation declines. One of the major results concerns the fact that severe depressive patients (first pass) exhibit normal semantic priming in a lexical decision task. These results indicate, in this clinical population, the preservation of controlled processes implicated in this lexical decision task.

Semantic Processing of Foveally and Parafoveally Presented Words in a Lexical Decision Task

1992 ◽  
Vol 45 (2) ◽  
pp. 299-322 ◽  
Author(s):  
Luis J. Fuentes ◽  
Pío Tudela
Keyword(s):  
Visual Field ◽  
Lexical Decision ◽  
Lexical Decision Task ◽  
Semantic Processing ◽  
Stimulus Onset ◽  
Decision Task ◽  
Inhibitory Effects ◽  
Target Stimulus Onset Asynchrony ◽  
Onset Asynchrony ◽  
Prime Target

Using a lexical decision task in which two primes appeared simultaneously in the visual field for 150 msec followed by a target word, two experiments examined semantic priming from attended and unattended primes as a function of both the separation between the primes in the visual field and the prime-target stimulus-onset asynchrony (SOA). In the first experiment significant priming effects were found for both the attended and unattended prime words, though the effect was much greater for the attended words. In addition, and also for both attention conditions, priming showed a tendency to increase with increasing eccentricity (2.3°, 3.3°, and 4.3°) between the prime words in the visual field at the long (550 and 850 msec) but not at the short (250 msec) prime-target SOA. In the second experiment the prime stimuli were either two words (W-W) or one word and five Xs (W-X). We manipulated the degree of eccentricity (2° and 3.6°) between the prime stimuli and used a prime-target SOA of 850 msec. Again significant priming was found for both the attended and unattended words but only the W-W condition showed a decrement in priming as a function of the separation between the primes; this decrement came to produce negative priming for the unattended word at the narrow (2°) separation. These results are discussed in relation to the semantic processing of parafoveal words and the inhibitory effects of focused attention.

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