Journal
HUMAN BRAIN MAPPING
Volume 43, Issue 4, Pages 1214-1230Publisher
WILEY
DOI: 10.1002/hbm.25716
Keywords
Chinese characters; ERP; N170; object recognition; recognition potential; visual masking
Funding
- National Natural Science Foundation of China (NSFC) [31400974, 31371132]
- Zhejiang Provincial Natural Science Foundation of China (ZJNSF) [LY18C090010]
- Zhejiang Provincial Dominant and Characteristic Disciplines Cultivation project of College of Education of Hangzhou Normal University [9JYXK023]
- China Scholarship Council
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This study investigated the impact of inter-stimulus interval (ISI) on the relationship between the N170 and recognition potential (RP), revealing reverse relationships between ISI and N170 latency, N1 jitter, and reaction time. The unique scalp topographies at the N1 peak across different conditions, from the longest ISI (N170) to the shortest (RP), suggest that the mask-delayed N1 remains the same N170. The results indicate a greater synthesis in the study of event related potential components.
Evoked response potentials are often divided up into numerous components, each with their own body of literature. But is there less variety than we might suppose? In this study, we nudge one component into looking like another. Both the N170 and recognition potential (RP) are N1 components in response to familiar objects. However, the RP is often measured with a forward mask that ends at stimulus onset whereas the N170 is often measured with no masking at all. This study investigates how inter-stimulus interval (ISI) may delay and distort the N170 into an RP by manipulating the temporal gap (ISI) between forward mask and target. The results revealed reverse relationships between the ISI on the one hand, and the N170 latency, single-trial N1 jitter (an approximation of N1 width) and reaction time on the other hand. Importantly, we find that scalp topographies have a unique signature at the N1 peak across all conditions, from the longest gap (N170) to the shortest (RP). These findings prove that the mask-delayed N1 is still the same N170, even under conditions that are normally associated with a different component like the RP. In general, our results suggest greater synthesis in the study of event related potential components.
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