Poster #: 58
Topic: Error signals
Wednesday, Sep 9, 2015
The role of stimulus complexity in various latency ranges of vMMN
1Cognitive Neuroscience 1, Institute of Cognitive Neuroscience and Psychology, Budapest, Hungary
2Cognitive Neuroscience Research Group 1., Institute of Cognitive Neuroscience and Psychology, RCNS HAS, Budapest, Hungary
3Institute of Cognitive Neuroscience and Psychology, RCNS HAS, Budapest, Hungary
In visual oddball studies a negativity emerges in the deviant-minus-standard difference wave within the 150-350 ms latency range. We investigated the processes underlying the negativity by applying additional control paradigms. Participants were instructed to play a videogame while windmill patterns were presented. Two oddball conditions with 6 and 12 vanes (V6 and V12) patterns (deviant p = 0.1) and two control conditions were applied. In the equal probability condition 10 windmill patterns that differed in the number of vanes were presented, and in a modified control condition there were 5 patterns (p = 0.1 and 0.225, respectively). An asymmetry appeared between the ERPs to the V6 and V12 patterns. V12 deviants elicited larger negativity than the V12 standard and V12 control both in an earlier (100-200 ms) and in a later (200-348) latency range. No such effects emerged to the V6 pattern. Accordingly, memory representation was built from both the sequences of V6 and V12, but the V6 deviant did not break the V12 sequence, therefore no V6-related vMMN emerged. As a possible explanation, continuous presentation of V12 adapts the neuronal population responsible for V6 (in other words, representation of the more complex stimulus included the representation of the less complex stimulus). However, the continuous presentation of V6 did not adapt the cell population responsible for V12. In the earlier latency both stimulus specific adaptation (effect on the standard) and (genuine) vMMN (effect on the deviant) appeared on V12, whereas in the later range deviant V12 elicited (genuine) vMMN.