Sound perception affected by nonlinear variation of accuracy in memory trace.
The mismatch negativity (MMN) reflects the neural representation of the acoustic environment stored in sensory memory. The short phase of sensory memory corresponds to the temporal window of integration (TWI) which integrates the neighboring sounds into a unitary event. We measured the magnetic MMN (MMNm) and the discriminative reaction time (RT) responding to an omitted segment incorporated into a complex sound. Consequently, for the late omitted segments, the MMNm amplitudes were decreased, and those latencies and the RTs were prolonged. The percentages of the correct responses were also reduced for the late omitted segments. In sum, the discriminative sensitivity nonlinearly declined toward the end of the TWI, suggesting that the time-wise accuracy of the neural trace nonlinearly varies in sensory memory.
Yabe
Hirooki
H
Department of Neuropsychiatry, Hirosaki University School of Medicine, Hirosaki 036-8562, Japan. yabe@cc.hirosaki-u.ac.jp
Asai
Ren
R
Hiruma
Tomiharu
T
Sutoh
Takeyuki
T
Koyama
Sachiko
S
Kakigi
Ryusuke
R
Tervaniemi
Mari
M
Kaneko
Sunao
S
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001307:Auditory Perception / Q000502:physiology*; D001931:Brain Mapping; D016022:Case-Control Studies; D003265:Contingent Negative Variation / Q000502:physiology*; D004192:Discrimination, Psychological / Q000502:physiology; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography / Q000379:methods; D008297:Male; D008568:Memory / Q000502:physiology*; D017711:Nonlinear Dynamics; D011930:Reaction Time / Q000502:physiology