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P300 hemispheric amplitude asymmetries from a visual oddball task (1995)

ALEXANDER, JOEL E. ; PORJESZ, BERNICE ; BAUER, LANCE O. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Psychophysiology 32 (1995), S. 0

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ISSN: 1469-8986

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine , Psychology

Notes: The P3(00) event-related potential (ERP) was elicited in 80 normal, right-handed male subjects using a simple visual discrimination task, with electroencephalographic (EEG) activity recorded at 19 electrodes. P3 amplitude was larger over the right than over the left hemisphere electrode sites primarily at anteromedial locations (F3/4, C3/4) for target, novel, and standard stimuli. The N1, P2, and N2 components also demonstrated hemispheric asymmetries. The strongest P3 hemispheric asymmetries for all stimuli were observed at anterior locations, suggesting a frontal right hemisphere localization for initial stimulus processing, although target stimuli produced larger P3 amplitudes at parietal locations than did novel stimuli. The relationships of hemispheric asymmetries to anatomical variables, background EEG activity, and neurocognitive factors are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1469-8986.1995.tb02098.x

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P300 topography of amplitude/latency correlations (1997)

Polich, John ; Alexander, Joel E. ; Bauer, Lance O. ; [et al.]

Springer

Brain topography 9 (1997), S. 275-282

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ISSN: 1573-6792

Keywords: Event-related potentials (ERPs) ; P3(00) ; Amplitude ; Latency ; Correlations ; Topography

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The correlational association from 19 electrode sites between peak amplitude and latency for the P3(00) event-related brain potential (ERP) for n=80 homogeneous subjects was assessed using a simple auditory discrimination task. The correlation strength varied systematically across scalp topography in different ways for the various ERP components. For the target stimuli, P3 amplitude and latency were negatively correlated and most tightly coupled over the frontal-central and right medial/lateral recording sites. In contrast, the N1 produced negative correlations that were strongest over the left and right central/lateral locations; P2 demonstrated a positive correlation that was strongest frontally and centrally; N2 demonstrated a positive correlations that was strongest over the central and parietal sites. ERPs from the standard stimuli produced generally similar patterns for the P3 and P2 components, with only weak or no reliable effects observed for the N1 and N2 potentials. Taken together, the findings suggest that analysis of amplitude/latency correlational relationships can provide information about ERP component generation. Theoretical implications are discussed.