Responses to deviants are modulated by subthreshold variability of the standard

作     者：Daikhin, Luba Ahissar, Merav 

作者机构：Hebrew Univ Jerusalem Dept Psychol & Cognit Sci IL-91905 Jerusalem Israel Hebrew Univ Jerusalem Edmond & Lily Safra Ctr Brain Sci IL-91905 Jerusalem Israel 

出 版 物：《PSYCHOPHYSIOLOGY》 (Psychophysiology)

年 卷 期：2012年第49卷第1期

页      面：31-42页

核心收录：

学科分类：0402[教育学-心理学(可授教育学、理学学位）] 0710[理学-生物学] 1001[医学-基础医学(可授医学、理学学位)] 07[理学] 071003[理学-生理学] 

基　　金：Israel Science Foundation National Institutes of Health (NIH) [RO1DCOO4855] 

主　　题：Cognition Learning memory Implicit processing Surprise Predictive coding EEG ERP 

摘      要：Auditory mechanisms automatically detect both basic features of sounds and the rules governing their presentation. In the oddball paradigm, the auditory system detects the sameness (or no-variability) rule when the same reference tone is consistently repeated. We used two oddball protocols, the classical one with a fixed reference and a modified one with a jittered reference, to determine whether the auditory system can detect subthreshold violations of sameness. We found that the response to the repeated standard was not modified by the small jitter. However, the response to the frequency oddball was smaller under the jittered protocol, indicating hypersensitivity to sameness. The sensitivity to jitter was largest when the oddball deviated by 8%, was smaller for 40%, and disappeared at 100% deviation, indicating that sensitivity to sameness is context dependent;namely, it is scaled with respect to the overall range of stimuli.