Evoked responses of human auditory cortex may be enhanced by preceding stimuli

Loveless, N.E.; Hari, Riitta; Ha¨ma¨la¨inen, Matti; Tiihonen, Jari

doi:10.1016/0013-4694(89)90008-4

Cited by 91 publications

(68 citation statements)

References 29 publications

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“…The N100m amplitude can increase as a result of either increased synchrony or number of the activated neurons (Hari, 1990), or as a sign of reduced active inhibition (Loveless, Hari, Hämäläinen, & Tiihonen, 1989). In the present study, the diminished N100m and N100m 0 amplitudes in dyslexic subjects were not accompanied by delayed latencies, and therefore, increased active inhibition, rather than a decrease in neuronal synchrony, could underlie these effects.…”

Section: Auditory Responses and Stimulus-driven Automatic Attentionsupporting

confidence: 49%

Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults

Renvall

Hari

2002

Journal of Cognitive Neuroscience

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Abstract& Auditory cortical processing of speech-like sounds was studied in 9 dyslexic and 11 normal-reading adults. Noise/ square-wave sequences, mimicking transitions from a fricative consonant to a vowel, were presented binaurally once every 1.1 sec and the cortical responses were recorded with a wholescalp neuromagnetometer. The auditory cortices of both hemispheres were less reactive to acoustical changes in dyslexics than in controls, as was evident from the weaker responses to the noise/square-wave transitions. The results demonstrate that dyslexic adults are deficient in processing acoustic changes presented in rapid succession within tens to hundreds of milliseconds. The observed differences could be related to insufficient triggering of automatic auditory attention, resulting, for instance, from a general deficiency of the magnocellular system. &

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Section: Auditory Responses and Stimulus-driven Automatic Attentionsupporting

confidence: 49%

Auditory Cortical Responses to Speech-Like Stimuli in Dyslexic Adults

Renvall

Hari

2002

Journal of Cognitive Neuroscience

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“…Repetition enhancement has been observed in an early MEG study (Loveless et al, 1989) that also established that enhancement effects are particularly strong for short ISIs (w150 ms). Possibly, for short delays between sounds temporal integration across sound events is reflected by enhanced MEG responses (Loveless et al, 1996).…”

Section: Repetition Enhancementmentioning

confidence: 92%

Repetition of complex frequency-modulated sweeps enhances neuromagnetic responses in the human auditory cortex

et al. 2011

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“…In humans, the N100 of auditory cortical onset responses decreases in amplitude and increases in latency as inter-stimulus intervals shorten (ISI, Davis and Zerlin, 1966). However, paradoxically, with ISIs of less than 500 ms, an enhancement of the N100 is seen peaking near 200 ms ISI (Loveless et al, 1989). In this experiment, the ''ISI'' (i.e., initial vowel onset to CV or second V onset) was 165 ms and therefore in the range for enhancement and not suppression.…”

Section: Consonants In Second Positionmentioning

confidence: 99%