Change detection and difference detection of tone duration discrimination.
An event-related potential called mismatch negativity is known to exhibit physiological evidence of sensory memory. Mismatch negativity is believed to represent complicated neuronal mechanisms in a variety of animals and in humans. We employed the auditory oddball paradigm varying sound durations and observed two types of duration mismatch negativity in anesthetized guinea pigs. One was a duration mismatch negativity whose increase in peak amplitude occurred immediately after onset of the stimulus difference in a decrement oddball paradigm. The other exhibited a peak amplitude increase closer to the offset of the longer stimulus in an increment oddball paradigm. These results demonstrated a mechanism to percept the difference of duration change and revealed the importance of the end of a stimulus for this perception.
Okazaki
Shuntaro
S
School of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, Kanagawa, Japan. okazaki@bpni.bio.keio.ac.jp
Kanoh
Shin'ichiro
S
Takaura
Kana
K
Tsukada
Minoru
M
Oka
Kotaro
K
D000161:Acoustic Stimulation; D000818:Animals; D001303:Auditory Cortex / Q000502:physiology*; D001306:Auditory Pathways / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D006168:Guinea Pigs; D010897:Pitch Discrimination / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D013997:Time Factors