Retrieval from Long-Term Memory: Dipole Sources Localization StudyстатьяТезисы
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 30 декабря 2016 г.
Аннотация:Brain mechanisms of successful and unsuccessful retrieval of the names of familiar people from the long-term memory were researched. The participants (N = 17, aged 18-20) were shown with photos of movie stars, whose names they needed to remember. Each photo was presented for 800 ms followed by 2000 ms pause. Event related potentials (ERP) were registered in three cases: 1. The participant successfully remembered the name; 2. The participant did not know the name; 3. The participant knew the name but was not able to remember it quick enough. EEG was registered using the 10-20% system (21 channels). Dipole sources of brain activity were calculated for each ERP (using BrainLoc 6.0 software). In case ‘3’ high activation of right parahippocampal, left orbital gyrus and left anterior cortex was present. In cases ‘1’ and ‘2’, when the participant had successfully accessed long-term memory, high activation of left precuneus was present. Besides, in case ‘1’ the activation in precuneus was higher than in case ‘2’. In case ‘3’ no activation in precuneus was registered. In other studies, activation in precuneus was also registered during recognition of familiar words, objects, and places (Maddock et al., 2001; Sugiura et al., 2005; Heun et al., 2006; Kozlovskiy et al., 2012). Activation in parahippocampal area was higher in case ‘3’ than in cases ‘1’ and ‘2’. In case ‘1’ activation in the Broca’s area was present around 400-500 ms from the stimulus. The obtained data allows for a suggestion that activation of precuneus is necessary for successful retrieval from long-term memory. Unsuccessful retrieval of a familiar name causes constant activation of hippocampal area, which means that such information exists in long-term memory but cannot be retrieved because precuneus is inhibited by the orbital gyrus and anterior cortex. Activation in the Broca’s area during the last stage of successful name retrieval may have been induced by the fact that participants were pronouncing the names of movie stars silently to themselves. The research was supported by the Russian Science Foundation (project № 16-18-00066).