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Vol. 8, No. 6, 2003
Issue release date: November–December 2003
Audiol Neurootol 2003;8:338–346

Preattentive Memory-Based Comparison of Sound Intensity

Jacobsen T. · Horenkamp T. · Schröger E.
Institut für Allgemeine Psychologie, Universität Leipzig, Leipzig, Germany

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Changes in the intensity of repeated, ignored sounds elicit the mismatch negativity (MMN) brain response which reflects preattentive detection of the change. It is generally assumed that the MMN in response to intensity changes reflects a memory-based comparison mechanism rather than being due to differential states of refractoriness of intensity-specific cortical neurons. In the present study, an experimental protocol consisting of 4 oddball blocks and 1 control block was used in order to separate memory-comparison-related effects from refractoriness-related ones. This design allowed an assessment of intensity MMN using physically identical stimuli with equal probability of occurrence in separate blocks, while avoiding contamination by refractoriness. Results were consistent with an MMN in response to intensity change that reflects genuine memory-based comparison.

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