Feature type effects in semantic memory: An event related potentials study

2005 ◽  
Vol 390 (3) ◽  
pp. 139-144 ◽  
Author(s):  
Giuseppe Sartori ◽  
David Polezzi ◽  
Francesca Mameli ◽  
Luigi Lombardi
Keyword(s):  
Semantic Memory ◽  
Event Related Potentials ◽  
Related Potentials

scholarly journals Interactions between mood and the structure of semantic memory: event-related potentials evidence

2012 ◽  
Vol 8 (5) ◽  
pp. 579-594 ◽  
Author(s):  
Ana P. Pinheiro ◽  
Elisabetta del Re ◽  
Paul G Nestor ◽  
Robert W. McCarley ◽  
Óscar F. Gonçalves ◽  
...  
Keyword(s):  
Semantic Memory ◽  
Event Related Potentials ◽  
Memory Event ◽  
Related Potentials

Remembering or knowing: electrophysiological evidence for an episodic memory deficit in schizophrenia

2002 ◽  
Vol 32 (7) ◽  
pp. 1261-1271 ◽  
Author(s):  
I. TENDOLKAR ◽  
S. RUHRMANN ◽  
A. BROCKHAUS ◽  
R. PUKROP ◽  
J. KLOSTERKÖTTER
Keyword(s):  
Episodic Memory ◽  
Semantic Memory ◽  
Time Course ◽  
Cognitive Deficit ◽  
Declarative Memory ◽  
Event Related Potentials ◽  
New Words ◽  
Frontal Electrode ◽  
Schizophrenic Patients ◽  
Related Potentials

Background. In schizophrenia, impaired conscious retrieval of past events and facts may represent a selective cognitive deficit of declarative memory against a background of a generalized neuropsychological impairment. We aimed to disentangle the neural subprocesses leading to this deficit applying the ‘Remember/Know procedure’.Method. Event-related potentials (ERPs) were recorded as 14 schizophrenic patients and 14 controls recognized an equal mixture of previously presented old and new words. For recognized old words, participants were required to judge whether recognition was associated with recollection (‘Remember’) or familiarity (‘Know’), either reflecting episodic or semantic memory.Results. Patients showed a lack of ‘Remember responses’, which led to more opportunities to make ‘Know responses’. ERPs for ‘Remember’ compared to ‘New responses’ differed consistently in controls over left temporo-parietal and right frontal electrode sites. Although schizophrenic patients showed the same topography for this Remember old/new effect, it was apparent over temporo-parietal sites for only 800 ms and over right frontal sites for 1100 ms post-stimulus. For controls, the Know old/new effect was elicited over temporo-parietal sites between 500 and 800 ms. For patients, it showed a widespread maximum over frontal sites between 500 and 1100 ms.Conclusions. The shorter time course of the left temporo-parietal Remember old/new effect suggests that the patients' episodic memory impairment was possibly mediated by a dysfunction of the mediotemporal regions. The more widespread frontal Know old/new effect in the patients suggests that the prefrontly mediated processes associated with retrieval of semantic memory may be enhanced compensatorily.

Event Related Potentials and EEG Components in a Semantic Memory Search Task

1992 ◽  
Vol 29 (1) ◽  
pp. 104-119 ◽  
Author(s):  
Axel Mecklinger ◽  
Arthur F. Kramer ◽  
David L. Strayer
Keyword(s):  
Semantic Memory ◽  
Search Task ◽  
Memory Search ◽  
Event Related Potentials ◽  
Related Potentials

scholarly journals Semantic richness and the activation of concepts in semantic memory: Evidence from event-related potentials

2009 ◽  
Vol 1282 ◽  
pp. 95-102 ◽  
Author(s):  
John Kounios ◽  
Deborah L. Green ◽  
Lisa Payne ◽  
Jessica I. Fleck ◽  
Ray Grondin ◽  
...  
Keyword(s):  
Semantic Memory ◽  
Event Related Potentials ◽  
Semantic Richness ◽  
Related Potentials

Repetition-priming Modulates Category-related Effects on Event-related Potentials: Further Evidence for Multiple Cortical Semantic Systems

2005 ◽  
Vol 17 (2) ◽  
pp. 199-211 ◽  
Author(s):  
Markus Kiefer
Keyword(s):  
Semantic Memory ◽  
Repetition Priming ◽  
Brain Activation ◽  
Event Related Potentials ◽  
Memory Structure ◽  
Decision Task ◽  
Behavioral Performance ◽  
Semantic Categorization ◽  
Performance Differences ◽  
Related Potentials

In the present study, the significance of category-related brain activations as an index of semantic memory structure was assessed within a repetition-priming paradigm during a lexical decision task. The interpretation of category-related effects has been debated since previous studies observed category-related brain activity mainly in tasks requiring explicit semantic categorization. Furthermore, categories were frequently associated with behavioral performance differences, which could have influenced the pattern of brain activation. Event-related potentials (ERPs) to words denoting objects from artifactual (e.g., tools) and natural categories (e.g., animals) were recorded while subjects were presented with words and pseudowords as distracters, which were repeatedly presented. Category-related ERP differences emerged in the time window of the N400, an electrophysiological index of semantic processing, over occipito-parietal and fronto-central regions as well as in the following window of a late positive potential. Repetition priming modulated these category-related ERP effects whereas behavioral repetition priming (faster reactions to repeated words) was comparable for both categories. Differences in ERP repetition effects were specifically due to diminished category-related activity at repeated presentation. The present results show that category-related brain activation is not confined to tasks requiring explicit semantic categorization. Most importantly, the study demonstrates that category-related brain activation can be specifically modulated by repetition priming in the absence of corresponding behavioral performance differences. These findings therefore substantiate the significance of category-related brain activations as reflections of semantic memory structure and support the notion of multiple cortical semantic systems.

scholarly journals Exploring the Organization of Semantic Memory through Unsupervised Analysis of Event-related Potentials

2018 ◽  
Vol 30 (3) ◽  
pp. 381-392 ◽  
Author(s):  
Marijn van Vliet ◽  
Marc M. Van Hulle ◽  
Riitta Salmelin
Keyword(s):  
Semantic Memory ◽  
Clustering Algorithm ◽  
Mental Lexicon ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
Experimental Conditions ◽  
Strict Adherence ◽  
Neurophysiological Data ◽  
Related Potentials ◽  
N400 Component

Modern multivariate methods have enabled the application of unsupervised techniques to analyze neurophysiological data without strict adherence to predefined experimental conditions. We demonstrate a multivariate method that leverages priming effects on the evoked potential to perform hierarchical clustering on a set of word stimuli. The current study focuses on the semantic relationships that play a key role in the organization of our mental lexicon of words and concepts. The N400 component of the event-related potential is considered a reliable neurophysiological response that is indicative of whether accessing one concept facilitates subsequent access to another (i.e., one “primes” the other). To further our understanding of the organization of the human mental lexicon, we propose to utilize the N400 component to drive a clustering algorithm that can uncover, given a set of words, which particular subsets of words show mutual priming. Such a scheme requires a reliable measurement of the amplitude of the N400 component without averaging across many trials, which was here achieved using a recently developed multivariate analysis method based on beamforming. We validated our method by demonstrating that it can reliably detect, without any prior information about the nature of the stimuli, a well-known feature of the organization of our semantic memory: the distinction between animate and inanimate concepts. These results motivate further application of our method to data-driven exploration of disputed or unknown relationships between stimuli.

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