Cross-modal selective attention effects on retinal, myogenic, brainstem, and cerebral evoked potentials.

摘要: Short latency evoked potentials were recorded during a cross-modal selective attention task to evaluate recent proposals that sensory transmission in the peripheral auditory and visual pathways can be modified selectively by centrifugal mechanisms humans. Twenty young adult subjects attended turn either left-ear tones or right-field flashes presented randomized sequence, order detect infrequent, lower-intensity targets. Attention-related enhancement of longer-latency components, including P105 N1/Nd waves T-complex, showed able adopt set toward modality. Neither brainstem nor early components (electroretinogram, occipito-temporal N40, P50, N70 waves) significantly affected attention. Measures retinal B-waves reduced amplitude when was directed flashes, but concurrent recordings eyelid electromyographic activity electro-oculogram indicated this effect may have resulted from contamination blink microreflex activity. A trend greater positivity 15-50 ms range for observed. These results provide further evidence earliest levels are unaffected attention, longer exogenous endogenous enhanced stimuli