Neural adaptation of visual ERP components: Effects of adaptor stimulus duration and interstimulus interval
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1
University of South Australia, Cognitive Neuroscience Laboratory, Australia
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2
Flinders University, Brain and Cognition Laboratory, Australia
Neural adaptation paradigms inform us of how our perceptual system dynamically changes in response to our environment. Systematically testing experimental variables that affect adaptation can further develop neural models of visual processing over time. The degree of neural response to a stimulus (S2) is affected by the presentation duration of the previous/adaptor stimulus (S1) and the interstimulus interval (ISI) duration, however there appears to be no systematic examination of the effects and interaction of these factors in ERP research. We systematically varied both S1 duration and ISI and assessed effects on the P1, N170 and P2 ERP components in face and object perception. Greyscale images of faces and chairs were presented at S1 and S2 level while EEG was recorded. In each trial an S1 stimulus was presented, followed by an ISI and an S2 stimulus. S1 stimuli were presented for 200ms, 500ms or 1000ms. The ISI was set at 200ms or 500ms. Peak amplitude measures were derived from ERPs to S2 stimuli in each condition. ISI affected all ERP component amplitudes, and S1 duration affected the N170 and P2 only. P1 and P2 components were smaller in the 200ms than 500ms ISI conditions, whereas the N170 was larger after 200ms ISIs. No effects of S1 duration were observed for the P1, however N170 and P2 amplitudes were smaller for longer S1 durations, particularly after shorter (200ms) ISIs. Effects of S1 duration on the N170 were specific to repetitions of the same stimuli category. The overall results demonstrate that effects of S1 duration and ISI are not consistent across ERP components, suggesting differential modulation of low and high-level vision over time. These results do not support a singular mechanism of adaptation across visual areas, but rather a complex pattern of neural activity modulations with continued processing of a visual stimulus.
Keywords:
face perception,
Event-related potentials,
P1,
N170,
P2,
Neural adaptation
Conference:
XII International Conference on Cognitive Neuroscience (ICON-XII), Brisbane, Queensland, Australia, 27 Jul - 31 Jul, 2014.
Presentation Type:
Poster
Topic:
Sensation and Perception
Citation:
Feuerriegel
D,
Churches
O,
Kohler
M and
Keage
H
(2015). Neural adaptation of visual ERP components: Effects of adaptor stimulus duration and interstimulus interval.
Conference Abstract:
XII International Conference on Cognitive Neuroscience (ICON-XII).
doi: 10.3389/conf.fnhum.2015.217.00150
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Received:
19 Feb 2015;
Published Online:
24 Apr 2015.
*
Correspondence:
Mr. Daniel Feuerriegel, University of South Australia, Cognitive Neuroscience Laboratory, Adelaide, Australia, Daniel.feuerriegel@unisa.edu.au