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We examined effects of significance of task irrelevant changes in the location of tones on the mismatch negativity (MMN) and P3a event related brain potentials. The participants were to discriminate between two frequency modulated tones differing from each other in the direction of frequency glide. Each tone was delivered through one of five loudspeakers in front of the participant. On most trials, a tone was presented from the same location as the preceding tone, but occasionally the location changed. In the Varying Location Condition, these changes, although irrelevant with regard to pitch discrimination, were still significant for performance as the following tones were presented from the new location where attention had to be therefore shifted. In the Fixed Location Condition, the location changes were less significant as the tones following a location change were presented from the original location. In both conditions, the location changes were associated with decreased hit rates and increased reaction times in the pitch discrimination task. However, the hit rate decrease was larger in the Fixed Location Condition suggesting that in this condition the location changes were just distractors. MMN and P3a responses were elicited by location changes in both conditions. In the Fixed Location Condition, a P3a was also elicited by the first tone following a location change at the original location while the MMN was not. Thus, the P3a appeared to be related to shifting of attention in space and was not tightly coupled with MMN elicitation.
This article was published in the following journal.
Name: Brain research
Electrically Evoked Auditory Event-Related Responses in Patients with Auditory Brainstem Implants: Morphological Characteristics, Test-Retest Reliability, Effects of Stimulation Level, and Association with Auditory Detection.
This study aimed to (1) characterize morphological characteristics of the electrically evoked cortical auditory event-related potentials (eERPs) and explore the potential association between onset eER...
It has been reported in alphabetic languages that individuals with schizophrenia showed language-related cognitive impairments including phonological deficits, which were in turn associated with clini...
This study examined the influence of verb-argument information and event-related plausibility on prediction of upcoming event locations in people with aphasia, as well as older and younger, neurotypic...
Experimental paradigms investigating the processing of self-induced stimuli are often based on the implicit assumption that motor processes are invariable regardless of their consequences: It is presu...
The Go/NoGo variants of the auditory event-related potentials were shown promising for clinical researches; however, prior to the wider application, it is important to evaluate potential modulating fa...
OBJECTIVES: I. Define the tonotopocity of multichannel brain stem stimulation and use this information to better program the auditory brain stem implant for an individual. II. Optimize...
The purpose of this study is to determine how changes in speech perception resulting from a computerized auditory training program are related to concurrent changes in auditory brainstem f...
This will be a prospective, blinded, cross-over study to compare the effects of two anesthetic techniques on the interpretability of auditory brainstem response testing in children.
Voltage fluctuation as a result of brain activity will be recorded into the computer using an EEG device.
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A late-appearing component of the event-related potential. P300 stands for a positive deflection in the event-related voltage potential at 300 millisecond poststimulus. Its amplitude increases with unpredictable, unlikely, or highly significant stimuli and thereby constitutes an index of mental activity. (From Campbell, Psychiatric Dictionary, 6th ed)
Surgical insertion of an electronic hearing device (AUDITORY BRAIN STEM IMPLANTS) with electrodes to the cochlea nucleus in the BRAIN STEM rather than to the inner ear as in COCHLEAR IMPLANTATION.
The recorded electrical responses from nerve, muscle, SENSORY RECEPTOR, or area of the CENTRAL NERVOUS SYSTEM following stimulation. They range from less than a microvolt to several microvolts. The evoked potential can be auditory (EVOKED POTENTIALS, AUDITORY), somatosensory (EVOKED POTENTIALS, SOMATOSENSORY), visual (EVOKED POTENTIALS, VISUAL), or motor (EVOKED POTENTIALS, MOTOR), or other modalities that have been reported. Often used synonymously to event-related potentials which are associated with higher level cognitive processes.
Electrical waves in the CEREBRAL CORTEX generated by BRAIN STEM structures in response to auditory click stimuli. These are found to be abnormal in many patients with CEREBELLOPONTINE ANGLE lesions, MULTIPLE SCLEROSIS, or other DEMYELINATING DISEASES.
The therapy technique of providing the status of one's own AUTONOMIC NERVOUS SYSTEM function (e.g., skin temperature, heartbeats, brain waves) as visual or auditory feedback in order to self-control related conditions (e.g., hypertension, migraine headaches).
Hearing, auditory perception, or audition is the ability to perceive sound by detecting vibrations, changes in the pressure of the surrounding medium through time, through an organ such as the ear. Sound may be heard through solid, liquid, or gaseous mat...
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