Thesis (M.S. Ed.) - - Bank Street College of Education, New York, 2005. / Includes bibliographical references and abstract.

Η παρούσα εργασία αποτελεί μια θεωρητική μελέτη των παραμέτρων που επηρεάζουν και συνιστούν ένα διαγνωστικό μηχάνημα επιληψίας. Η εργασία χωρίζεται σε δύο μέρη. Στο πρώτο μέρος και στο πρώτο κεφάλαιο επιχειρείται μια συνεκτική και απλουστευμένη παρουσίαση του πεδίου εφαρμογής του ηλεκτροεγκεφαλογραφήματος, του εγκεφάλου. Δίνεται επίσης μια εικόνα για τους μηχανισμούς της προέλευσης των σημάτων που καταγράφονται στο ΗΕΓ. Τέλος γίνεται αναφορά στη νόσο της επιληψίας και τους τύπους των κρίσεων που παρουσιάζονται. Στο δεύτερο κεφάλαιο γίνεται αναφορά στις μεθόδους που έχουν χρησιμοποιηθεί για την καταγραφή και την απεικόνιση των σημάτων του εγκεφάλου και ειδικότερα στο ΗΕΓ. Πιο συγκεκριμενα παρουσιάζεται ο μηχανισμός καταγραφής του ΗΕΓ καθώς και οι ρυθμοί της εγκεφαλικής δραστηριότητας που αποτυπόνωνται. Στο δεύτερο μέρος περιγράφονται τα εργαλεία που χρησιμοποιεί ένα διαγνωστικό μηχάνημα. Στο τρίτο κεφάλαιο δίνεται μετασχηματισμός wavelet που αποτελεί χρήσιμο εργαλείο στην ανάλυση των βιοσημάτων. Στο τέταρτο κεφάλαιο παρουσιάζεται η ανάλυση ανεξάρτητων συνιστωσών (ICA), απαραίτητη για το διαχωρισμό των καταγραφόμενων σημάτων και στο κεφάλαιο 5 περιγράφονται μερικές παράμετροι που εξάγονται από τα βιοσήματα και βοηθούν στην καλύτερη επεξεργασία τους. Στο κεφάλαιο 6 περιγράφονται κάποια χαρακτηριστικά των νευρωνικών δικτύων(βασικό τμήμα ενός διαγνωστικόυ μηχανήματος) καθώς και ο αλγόριθμος οπίσθιας διάδοσης σφάλματος που χρησιμεύει στην εκπαίδευση των νευρωνικών δικτύων. Τέλος στο έβδομο κεφάλαιο γίνεται μια τυπική εκπαίδευση νευρωνικού δικτύου με μονοκάναλα δεδομένα, μετά από κατάλληλη επεξεργασία. / -

Το ηλεκτροεγκεφαλογράφημα (ΗΕΓ) είναι μια καταγραφή διαφορών δυναμικού στο τριχωτό της κεφαλής που προέρχονται από τη βιοηλεκτρική δραστηριότητα του εγκεφάλου. Με ιστορία άνω των 70 ετών, η αξία του ΗΕΓ σαν κλινική εξέταση είναι δεδομένη, με σημαντικό πλεονέκτημα το γεγονός ότι είναι μια μη επεμβατική μέθοδος. Ωστόσο, το πλήθος των ιστών που παρεμβάλλονται ανάμεσα στον εγκέφαλο και το τριχωτό της κεφαλής, σε συνδυασμό με το μικρό ύψος των εγκεφαλικών ρυθμών (τάξης μV) κάνουν τις ΗΕΓ καταγραφές επιρρεπείς σε πλήθος παρασίτων εξωεγκεφαλικής προέλευσης (artifacts). Όσον αφορά την κλινική εξέταση το πρόβλημα των artifacts είναι αντιμετωπίσιμο σε κάποιο βαθμό. Άλλωστε, για την κλινική εξέταση έχουν λογική μια απαίτηση ακινησίας και ηρεμίας του εξεταζομένου, που δεν είναι όμως πάντα δυνατή, σε ηλεκτρομαγνητικά θωρακισμένο χώρο, το κόστος του οποίου είναι αποσβέσιμο σε μακροπρόθεσμο χρονικό ορίζοντα. Σε τελική ανάλυση, η διάρκεια καταγραφής ενός ΗΕΓ μπορεί να επιμηκυνθεί τόσο όσο χρειάζεται ο κλινικός ιατρός ώστε να εξάγει ασφαλή διάγνωση. Τέτοιου είδους περιορισμοί όμως, μάλλον φαντάζουν εκτός λογικής σε φιλόδοξες εμπορικές εφαρμογές στον τομέα του Brain Computer Interface. Οι λύσεις σε αυτόν τον τομέα πρέπει να είναι φθηνές, να δουλεύουν ικανοποιητικά στο συνηθισμένο οικιακό ή εργασιακό περιβάλλον και να μην περιορίζουν τον χρήστη. Η προσέγγιση λοιπόν δεν πρέπει να είναι τόσο στον περιορισμό των artifacts, όσο στην αναγνώριση και αφαίρεσή τους. Στην παρούσα εργασία η αφαίρεση των artifacts προσεγγίζεται σαν ένα πρόβλημα Τυφλού Διαχωρισμού Σημάτων. Εφαρμόζονται τεχνικές Ανάλυσης Ανεξαρτήτων Συνιστωσών με σκοπό το διαχωρισμό των artifacts σε ξεχωριστές Ανεξάρτητες Συνιστώσες κάνοντας εύκολη στη συνέχεια την αφαίρεση τους Η παραπάνω προσέγγιση εκτός της προαναφερθείσας εφαρμογής στον τομέα του Brain Computer Interface, έχει σαφώς και κλινική αξία. Θα μπορούσε να εφαρμοστεί για παράδειγμα σε μη συνεργάσιμους ασθενείς (π.χ. μικρά παιδιά) ή σε θορυβώδη εξωτερικά περιβάλλοντα αποσυνδέοντας το ηλεκτροεγκεφαλογράφημα από την απαίτηση ενός καλά ελεγχόμενου, ηλεκτρομαγνητικά θωρακισμένου χώρου. / --

Η βέλτιστη γεωμετρική προσομοίωση του εγκεφάλου επιτυγχάνεται με ένα ελλειψοειδές. Η ηλεκτροεγκεφαλογραφία (ΗΕΓ) αφορά τις μετρήσεις του ηλεκτρικού δυναμικού στην επιφάνεια του κρανίου που αναπτύσσεται από νευρωνικά ρεύματα στο εσωτερικό του εγκεφάλου. Στην παρούσα εργασία έχουν παραχθεί οι απαιτούμενες ελλειψοειδείς αρμονικές πέμπτου, έκτου και εβδόμου βαθμού. Στη συνέχεια, χρησιμοποιούμε αυτές τις νέες ελλειψοειδείς αρμονικές συναρτήσεις για να εκφράσουμε το πλήρες αναλυτικό δυναμικό της ΗΕΓ. H δομή της εργασίας είναι: Στο κεφάλαιο 1 περιγράφεται περιληπτικά η φυσιολογία ανάπτυξης δυναμικών στην περιοχή του εγκεφάλου και πως επιτυγχάνεται η μετάδοση αυτών των σημάτων μέσω των νευρώνων. Στο κεφάλαιο 2 περιγράφεται η ελλειψοειδής γεωμετρία καθώς και η μορφή του τελεστή του Laplace στο ελλειψοειδές σύστημα συντεταγμένων. Αναφερόμαστε στην επίλυση της εξίσωσης Lame, στον τρόπο κατασκευής των συναρτήσεων Lame και περιγράφουμε τις αντίστοιχες ελλειψοειδείς αρμονικές. Στο κεφάλαιο 3 καταγράφουμε τις ελλειψοειδείς αρμονικές βαθμού 3. Στα κεφάλαια 4,5,6 και 7 παράγουμε τις ελλειψοειδείς αρμονικές βαθμού 4,5,6 και 7, αντίστοιχα, όπου η εφαρμογή των οποίων στην ΗΕΓ αποτελεί και το θέμα της παρούσας εργασίας. Τέλος στο κεφάλαιο 8 χρησιμοποιούμε τις ελλειψοειδείς αρμονικές που κατασκευάσαμε για να επιτύχουμε την ακριβή συνιστώσα του ηλεκτρικού δυναμικού που ανήκει στον ελλειψοειδή αρμονικό υπόχωρο που γεννούν οι 64 πρώτες αρμονικές συναρτήσεις. / The best geometric simulation of the human brain is achieved by an ellipsoidal system. The Electroencephalography (EEG) concerns the measurements of the electric potential on the surface of the head, which is generated from neuronal current inside the head. In this thesis we have produced the necessary ellipsoidal harmonics of the fifth, sixth and seventh degree. Then, we use these new ellipsoidal harmonic functions to express the full analytical potential of EEG, up to the seventh degree. The present thesis is structured in the following way: In chapter 1 we describe, in short, the physiology which develops the potentials in and outside the brain and how they are transmitted through the neuronal current. In chapter 2 we describe the ellipsoidal geometry as well as the form of the Laplace operator in ellipsoidal coordinates. We consider the solutions of Lame equation, the way Lame constructed them and we describe the corresponding ellipsoidal harmonics. In chapter 3 we report the ellipsoidal harmonics of degree zero through three. In chapters 4, 5, 6 and 7 we develop the ellipsoidal harmonics of degree 4, 5, 6 and 7 respectively. The applications of these functions form the main part of the present master thesis. Finally, in chapter 8 we use all the known ellipsoidal harmonics to express the relative component of the electrical potential. This component belongs to the subspace generated by the first 64 ellipsoidal harmonics.

Στην παρούσα Μεταπτυχιακή Διπλωματική Εργασία υλοποιήθηκε ένα προγραμματιστικό περιβάλλον σε Matlab το οποίο μας επιτρέπει να μελετήσουμε τη συσχέτιση της δυναμικής βιολογικών νευρωνικών δικτύων με χρήση ομοιοματικών τεχνικών και μαθηματικών μοντέλων. Για το λόγο αυτό αναπτύχθηκαν προγράμματα που υλοποιούν μαθηματικά μοντέλα της δυναμικής νευρωνικών πληθυσμών και αντίστοιχα ομοιοματικές μέθοδοι. Το περιβάλλον δίνει τη δυνατότητα διερεύνησης της δυναμικής με τους δύο αυτούς τρόπους και παρέχει τρόπους σύγκρισης μεταξύ τους, ώστε να διερευνηθεί αν από τους δύο αυτούς τρόπους προσέγγισης, υπό τις ίδιες αρχικές συνθήκες, προκύπτουν αποτελέσματα συγκρίσιμα μεταξύ τους. Αρχικά, εξομοιώθηκε ένα βιολογικό νευρωνικό δίκτυο στην προσπάθεια προσέγγισης της λειτουργίας του ανθρώπινου εγκεφάλου από έναν υπολογιστή. Εξομοιώσαμε ένα νευρωνικό δίκτυο χρησιμοποιώντας μια σχέση η οποία δεδομένων των παραμέτρων του δικτύου και της κατάστασης διεγερσιμότητας του δικτύου αn κάποια χρονική στιγμή n υπολογίζει την κατάσταση διεγερσιμότητας του δικτύου αn+1 την επόμενη χρονική στιγμή n+1. Στη συνέχεια, περιγράφονται και αναλύονται μαθηματικά μοντέλα που χρησιμοποιήθηκαν για τη μακροσκοπική (στατιστική) συμπεριφορά των μεμονωμένων – δηλαδή χωρίς εξωτερικές συνδέσεις – νευρωνικών δικτύων (ομάδων αλληλοσυνδεδεμένων νευρώνων) του Κεντρικού Νευρικού Συστήματος. Μελετώντας κάποιες ξεχωριστές περιπτώσεις των νευρωνικών δικτύων και κάνοντας συγκεκριμένες θεωρήσεις για την κάθε μια, καταλήγουμε σε μαθηματικές εξισώσεις που αφορούν την περιγραφή της δυναμικής των δικτύων. Θα παρουσιαστεί, δηλαδή ένα πακέτο προγραμμάτων υλοποιημένο στο περιβάλλον Matlab που θα δέχεται ως είσοδο παραμέτρους του νευρωνικού πληθυσμού (δικτύου), θα υλοποιεί τις δύο μεθόδους μελέτης της δυναμικής του και θα εμφανίζει και θα συγκρίνει τα λαμβανόμενα αποτελέσματα. Ο σκοπός της εν λόγω διπλωματικής είναι η σύγκριση των αποτελεσμάτων που προκύπτουν για τη δυναμική νευρωνικών πληθυσμών με χρήση μαθηματικών μοντέλων σε σχέση με τα αντίστοιχα αποτελέσματα που προκύπτουν με χρήση μεθόδων εξομοίωσης. / -

Submitted by Timbo Noeme (noeme.timbo@metodista.br) on 2016-08-05T19:19:09Z No. of bitstreams: 1 Mirna Delposo Lozano.pdf: 1463468 bytes, checksum: bbd20a7a5bd6a05109d938c02309c9a0 (MD5) / Made available in DSpace on 2016-08-05T19:19:09Z (GMT). No. of bitstreams: 1 Mirna Delposo Lozano.pdf: 1463468 bytes, checksum: bbd20a7a5bd6a05109d938c02309c9a0 (MD5) Previous issue date: 2016-03-07 / The practice of yoga has become more popular increasingly not only for the physical benefits, but mostly for the psychological well-being brought by its practice. One of the components of yoga is Prãnãyama, or breath control. Attention and breathing are two physiological and involuntary mechanisms required for the implementation of Prãnãyama. The aim of this study was to determine whether continuous variables of EEG (power of different groups that compose it) would be modulated by the respiratory control, comparing both phases, inspiration and expiration, separately. The participants were 19 subjects (7 men/12 women, mean age 36.89, SD = ± 14.46), who were invited to participate in the research at the Faculdade de Saúde da Universidade Metodista de São Paulo. For the record of the EEG a positioning system of five electrodes Ag AgCl (Fpz, Fz, Cz, Pz and Oz) was used, fixed to a fast positioning cap (Quick-Cap, Neuromedical Supplies®) in 10-20 system. Maximum range of power values were obtained (power spectrum in the frequency domain) in theta frequencies, alpha, beta and delta and theta/beta ratio was calculated in the different phases of the respiratory cycle (inspiration and expiration), separately, in spontaneous breathing conditions and respiratory control. For the record of the respiratory cycle, a respiratory effort belt M01 (plethysmograph) was used. The results show significant differences between the conditions of spontaneous and controlled breathing with higher mean values of theta/beta ratio in the inspiration of spontaneous breathing than in controlled breathing, and mean values of alpha power higher in controlled breathing. Significant differences were found in the comparison between inspiration and expiration of controlled breathing with decreased values of the mean of theta/beta ratio in inspiration and an increase in mean values of alpha power in expiration. The findings of this study provide evidence that the respiratory control modulates electrophysiological variables related to attention, reflecting an alert status, but more relaxed compared to the spontaneous breathing situation. / A prática do ioga tem se tornado cada vez mais popular, não apenas pelos benefícios físicos, mas principalmente pelo bem-estar psicológico trazido pela sua prática. Um dos componentes do ioga é o Prãnãyama, ou controle da respiração. A atenção e a respiração são dois mecanismos fisiológicos e involuntários requeridos para a execução do Prãnãyama. O principal objetivo desse estudo foi verificar se variáveis contínuas do EEG (potência de diferentes faixas que o compõem) seriam moduladas pelo controle respiratório, comparando-se separadamente as duas fases do ciclo respiratório (inspiração e expiração), na situação de respiração espontânea e controlada. Fizeram parte do estudo 19 sujeitos (7 homens/12 mulheres, idade média de 36,89 e DP = ± 14,46) que foram convidados a participar da pesquisa nas dependências da Faculdade de Saúde da Universidade Metodista de São Paulo. Para o registro do eletroencefalograma foi utilizado um sistema de posicionamento de cinco eletrodos Ag AgCl (FPz, Fz, Cz, Pz e Oz) fixados a uma touca de posicionamento rápido (Quick-Cap, Neuromedical Supplies®), em sistema 10-20. Foram obtidos valores de máxima amplitude de potência (espectro de potência no domínio da frequência) nas frequências teta, alfa e beta e delta e calculada a razão teta/beta nas diferentes fases do ciclo respiratório (inspiração e expiração), separadamente, nas condições de respiração espontânea e de controle respiratório. Para o registro do ciclo respiratório, foi utilizada uma cinta de esforço respiratório M01 (Pletismógrafo). Os resultados mostram diferenças significativas entre as condições de respiração espontânea e de controle com valores das médias da razão teta/beta menores na respiração controlada do que na respiração espontânea e valores de média da potência alfa sempre maiores no controle respiratório. Diferenças significativas foram encontradas na comparação entre inspiração e expiração da respiração controlada com diminuição dos valores das médias da razão teta/beta na inspiração e aumento nos valores das médias da potência alfa, sobretudo na expiração. Os achados deste estudo trazem evidências de que o controle respiratório modula variáveis eletrofisiológicas relativas à atenção refletindo um estado de alerta, porém mais relaxado do que na situação de respiração espontânea.

Made available in DSpace on 2016-08-03T16:34:28Z (GMT). No. of bitstreams: 1 Henrique Adam Pasquini.pdf: 888682 bytes, checksum: 3ba99f5587a48f9130c806e394f12f25 (MD5) Previous issue date: 2013-08-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Attention is probably one of the oldest theoretical constructs in Psychology. In the Eastern countries, meditation has been seen as a group of technics that goals to train people to focus attention. This research aims to check its electrophysiological correlates, taking into consideration the long term changes accompanying regular practice of meditation. We have used modern technics of high resolution electroencephalography analyze slow potentials, power in various bands, and event-related band-power. We recorded the EEG using a 128-channel montage, in 31 subjects (17 meditators). We analyzed the type of meditation related to a Zen Buddhist practice of the Soto school, which belongs to the group of mindfulness meditation. The goal of the research was to verify if the power on the beta band would rise. However, not quite what we expected, no significant changes were detected on the beta band. On the other hand, the main finding of this research was that the weekly practice of meditation is associated with a rise in the induced relative theta band power, an increase in the ratio of induced power (theta/beta), and an increase in the ratio of the induced relative band power (theta/beta), which occurred during an adapted meditation task. We also noticed that the practice of meditation was related to a decrease of the alpha peak frequency during the task of focused attention. We discuss the decrease of the alpha peak frequency with respect to the hypothesis of brain efficiency. On the other hand, the increase of the induced relative theta band power and of the ratio of theta/beta induced power bands, during the adapted meditation task, suggests that the plain attention type of meditation is rather related to a deliberate loss of attention, by the permissive distractions of the meditators. / A atenção talvez seja um dos constructos teóricos mais antigos da psicologia. A meditação, por sua vez, tem sido vista no ocidente como um conjunto de técnicas que objetivam o treino da focalização da atenção. Esta pesquisa teve como principal objetivo verificar os correlatos eletrofisiológicos das modificações da atenção em longo prazo em meditadores regulares. Utilizamos as modernas técnicas de eletroencefalografia de alta resolução aplicadas aos potenciais lentos, espectros de potência, potências relacionadas aos eventos. Para obtenção dos registros encefalográficos nós utilizamos uma montagem de 128 canais, em 31 sujeitos (17 meditadores). A meditação estudada compreendeu uma prática zen budista da escola Soto que pertence ao grupo das meditações da atenção plena . A motivação deste estudo foi verificar se a potência na faixa beta se apresentaria aumentada nos meditadores. No entanto, ao contrário do que esperávamos, nenhuma alteração significativa foi encontrada na frequência beta. Em contrapartida, o principal achado do estudo foram correlações entre a frequência da prática semanal da meditação e: o aumento da potência teta induzida relativa, aumento da razão entre potências induzidas (razão teta/beta), e o aumento da razão entre potências induzidas relativas (razão teta/beta) durante nossa tarefa que caracterizou uma meditação adaptada . Verificamos ainda que a prática meditativa apresentou correlação com a diminuição da frequência de pico da faixa alfa durante a tarefa de atenção focada. Discutimos essa diminuição da frequência de pico alfa com respeito a hipóteses de eficiência cerebral. Já o aumento da potência teta induzida relativa, da razão teta/beta das potências induzidas, tomando seus valores absolutos e relativos, bem como o aumento da entre potências induzidas, tomando seus valores relativos, durante a tarefa de observação passiva, sugere que o estado meditativo da atenção plena está muito mais relacionado à permissividade de distrações por parte dos meditadores, com uma diminuição deliberada da atenção.

Mounting evidence has suggested that structures such as the anterior cingulate cortex (ACC) and other areas within the medial-frontal cortex are part of a reinforcement learning system responsible for the optimization of behaviour (Holroyd & Coles, 2002). However, we also learn without reinforcement and it has been less clear what neural structures are recruited in these instances. The P300 component of the human event-related brain potential (ERP) has been intensely researched in regards to context updating and the processing of novel stimuli (Spencer, Dien, & Donchin, 2001). Here, I sought to elaborate on the role of the P300 ERP component in implicit learning of stimulus frequencies – learning driven by the stimulus itself and not reward feedback. I propose over the course of three experiments that I have provided evidence indicating that the P300 and its neural sources play a role in feedback-free learning mechanisms. Specifically, in a feedback-free paradigm participants are shown to learn stimulus frequencies. While this occurs, P300 amplitude scales in line with participant behaviour and stimulus frequency. A common trend is revealed in how quickly this amplitude scaling occurs, suggesting further mechanisms are at play. Trial-by-trial analysis ultimately shows that behavioural prediction error formula and neural correlate prediction errors utilize a nearly identical function. These trends hold even in a passive auditory task in which the participant is fully distracted. / Graduate

x, 133 p. ; ill. (some col.) A print copy of this title is available through the UO Libraries under the call number: SCIENCE QP405 .J67 2007 / Meditation has been defined as a "group of practices that self-regulate the body and mind, thereby affecting mental events by engaging a specific attentional set" (Cahn & Polich, 2006). We conducted a randomized, longitudinal trial to examine the effects of concentrative meditation training (40 min/day, 5 days/week for 8 weeks) on top-down, voluntary control of attention with a progressive muscle relaxation training group as a control. To determine if training produced changes in attentional network efficiency we compared, pre- and post-training, mean validity effect scores (difference between invalid cue and center cue reaction time) in the contingent capture paradigm (Folk et al., 1992). The meditation group showed a trend towards improvement of top-down attention while the relaxation group did not. Using EEG we assessed the changes in amplitudes of wavelets during periods of mind-wandering and meditation. Periods in which subjects were on- vs. off-focus during the meditation task were identified by asking subjects to make button presses whenever the mind wandered and also at probe tones, if they were off-focus. After training, the episodes of mind-wandering were significantly lower in the meditation group as compared to the relaxation group. Increased amplitudes of alpha and theta EEG frequencies in the occipital and right parietal areas were seen during the meditation task for the meditation but not the relaxation group as an effect of training. A baseline EEG trait effect of reduced mental activity was seen (meditation training: occipital and right parietal areas; relaxation training: only occipital areas). Within a given meditation session, prior to training, alpha and theta activity was lower in on-focus conditions (occurring immediately after subjects discovered they were off-focus and returned to active focus on the breath/syllable) compared to meditative focus segments. After training, we found higher alpha amplitude in periods of meditative focus as compared to periods of mind wandering for both groups. However, the meditation group showed significantly higher theta amplitude than the relaxation group during the meditative state segments. / Adviser: Marjorie Woollacott

Executantes habilidosos desenvolvem uma capacidade de perceber e processar uma vasta quantidade de informações com velocidade e precisão, bem como o de realizar ajustes eficientes quando necessário (Schmidt e Wrisberg 2001). Corticalmente, para obter esse controle mais refinado, a integração sensoriomotora é fundamental. Essa integração consiste no contínuo processamento, pelo sistema motor, das aferências sensoriais que preparam para o ato motor e melhoram a execução de atividades de controle motor fino (Minc et al., 2010). Atividades físicas que diferem exatamente em relação a como seus praticantes necessitam processar as informações sensoriais para gerar o movimento, devem resultar em integrações sensoriomotoras distintas. Este estudo tem como objetivo analisar a atividade eletroencefálica de indivíduos com habilidades percepto-motoras distintas (indivíduos altamente habilidosos com treinamento em dança/TD e treinamento em vôlei/TV), evocados por tarefas de simulação de ação. A amostra do presente estudo foi intencional e composta por 14 participantes destros, cada grupo foi constituído por 07 mulheres com idade entre 18 anos e 29 anos. Através de EEG, foram extraídos os parâmetros de média de energia (processamento cortical ao longo do tempo), amplitude (número de elementos neuronais envolvidos na tarefa) e frequência (ritmo oscilatório predominante) na banda alfa e gama do sinal cerebral nos pontos C3, C4, Cz (córtex motor primário), F3 (área motora suplementar esquerda), F7 (córtex pré-motor esquerdo), P3, P4 e Pz (córtex parietal), evocados por tarefas envolvendo a observação e imaginação de gestos específicos dos dois treinamentos e gestos considerados como neutros. Os principais resultados encontrados forneceram evidências de que o grupo TD apresentou, nas tarefas de dança, um maior processamento cortical ao longo do tempo nos pontos referentes ao córtex motor primário (Minc et al., 2010), córtex pré-motor (Freund e Hummelsheim, 1984) e área motora suplementar (Serrien et al.,2002) esquerdos; maior número de elementos neuronais envolvidos na tarefa no ponto referente ao córtex motor primário esquerdo; diferenças na principal componente da frequência no ritmo alfa no córtex motor primário esquerdo; e diferenças na principal componente da frequência no ritmo gama no córtex motor primário direito. Nas tarefas referentes ao treinamento em vôlei, o grupo TV apresentou menor processamento ao longo do tempo nos pontos parietal (Wolpert et al., 1998); menor número de elementos neuronais envolvidos na tarefa nos pontos referentes aos córtices motor primário e pré-motor esquerdos e diferença na principal componente da frequência no ritmo gama no córtex motor primário esquerdo. Nas tarefas consideradas como neutras foram encontradas diferenças entre os grupos no córtex motor primário direito no ritmo alfa e no córtex parietal direito no ritmo gama. Os resultados encontrados no presente estudo nos parâmetros que representam o processamento cortical, que refletem o número de elementos neuronais envolvidos na tarefa e que representam o ritmo oscilatório predominante demonstraram claramente que as regiões corticais envolvidas na integração sensoriomotora apresentaram diferenças na forma como os dois grupos processaram a informação sensorial e prepararam o gesto motor. Tomados em conjunto, esses resultados demonstram que cada grupo apresentou um padrão constante de processamento sensoriomotor, independente da tarefa. Essas evidências nos permitem concluir que indivíduos com diferentes habilidades percepto-motoras apresentam integrações sensoriomotoras distintas. / Skilled performers develop an ability to perceive and process a vast amount of information with speed and accuracy, as well as to perform efficient adjustments when necessary (Schmidt and Wrisberg 2001). Cortically to achieve this finer control, sensorimotor integration is the key. This integration consists in continuous processing, by the motor system, the sensory afferents that prepare for the motor act and improve the performance of activities for fine motor control (Minc et al., 2010). Physical activities that differ over exactly how its practitioners need to process sensory information to generate movement should result in distinct sensorimotor integration. This study aims to analyze the electroencephalography activity of individuals with perceptual-motor skills (highly skilled individuals with training in dance/TD and training in volleyball/TV) evoked by action simulation tasks. The study sample was intentional and composed of 14 right-handed participants; each group consisted of 07 women aged between 18 and 29 years. Through EEG were extracted parameters mean energy (cortical processing over time), amplitude (number of neural elements involved in the task) and frequency (oscillating rhythm predominant) in alpha and gamma bands in the brain signal points C3, C4, Cz (primary motor cortex), F3 (left supplementary motor area), F7 (left premotor cortex), P3, P4 and Pz (parietal cortex), evoked by tasks involving observation and imagination of specific gestures of both training and gestures considered neutral. The main results provided evidence that the TD group presented the tasks of dance, a higher cortical processing over time in points for the primary motor cortex (Minc et al., 2010), left premotor cortex (Freund and Hummelsheim, 1984) and left supplementary motor area (Serrien et al. 2002); greater number of neural elements involved in the task at point for the left primary motor cortex; differences in the main frequency component of the alpha rhythm in the left primary motor cortex , and differences in the main component of the frequency gamma in the right primary motor cortex. In tasks relating to training volleyball, VT group showed lower processing over time at parietal points (Wolpert et al. 1998); smaller number of neural elements involved in the task at points related to left primary motor cortex and left premotor and main component difference in the frequency gamma in the left primary motor cortex. In the tasks considered neutral differences were found between groups in the right primary motor cortex in the alpha rhythm and in the right parietal cortex in the gamma rhythm. The results found in this study at the parameters that represent the cortical processing, that reflect the number of neuronal elements involved in the task and which represent the predominant rhythm oscillatory clearly demonstrated that cortical regions involved in sensorimotor integration showed differences in how the two groups processed sensory information and prepared the gesture motor. Taken together, these results demonstrate that each group had a consistent pattern of sensorimotor processing, regardless of the task. This evidence allows us to conclude that individuals with different perceptual-motor skills have distinct sensorimotor integration.