ERP and EOG responses elicited by deviant tones when presented with and without standard tones to reading subjects.
Event-related potentials (ERPs) and horizontal electro-oculograms (HEOGs) were recorded in 11 subjects to infrequently presented spatially deviant tones (oddball-deviants) embedded in a series of frequently presented standard tones and also to these deviant tones when presented without the standard tones (alone-deviants). Subjects were instructed to read a self-selected book during the stimulus presentation. The mismatch negativity (MMN), a component of the ERP, was elicited by the oddball-deviants, whereas ERPs to the alone-deviants were characterized by a prominent N1. In an additional counting condition (subjects counting the oddball-deviants), the MMN to the oddball-deviants was followed by the P3b. Although the effects of pre-attentive and attentive processing of the oddball-deviants were evident in the ERPs, HEOGs were affected by these stimuli in neither reading nor counting condition. In contrast, robust HEOG responses were elicited by the alone-deviants in the reading condition. The results suggest that reading is a sufficiently demanding task to enable the subject to effectively ignore the oddball-deviants but not the alone-deviants.
Ruusuvirta
T
T
Department of Psychology, University of Jyväskylä, Jyväskylä, Finland. timor@avocado.pc.helsinki.fi
D000161:Acoustic Stimulation / Q000379:methods*; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology; D004585:Electrooculography / Q000379:methods; D005071:Evoked Potentials / Q000502:physiology*; D005133:Eye Movements / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology*; D011932:Reading