کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5040401 1473849 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temporal and spatial localization of prediction-error signals in the visual brain
ترجمه فارسی عنوان
محلی سازی و مکان فضایی سیگنال خطای پیش بینی در مغز بینایی
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
چکیده انگلیسی


- Using a clever design we test visual ERP responses to unexpected stimulus transitions.
- We show that the N170 ERP is robustly modulated by expectation violations.
- These effects occur across a range of types of stimulus and contextual trajectories.
- MEG identifies brain areas MT and STS as generators of M170 expectation violation signals with respect to rotational trajectories.
- We conclude that N170 is in part a prediction error signal.

It has been suggested that the brain pre-empts changes in the environment through generating predictions, although real-time electrophysiological evidence of prediction violations in the domain of visual perception remain elusive. In a series of experiments we showed participants sequences of images that followed a predictable implied sequence or whose final image violated the implied sequence. Through careful design we were able to use the same final image transitions across predictable and unpredictable conditions, ensuring that any differences in neural responses were due only to preceding context and not to the images themselves. EEG and MEG recordings showed that early (N170) and mid-latency (N300) visual evoked potentials were robustly modulated by images that violated the implied sequence across a range of types of image change (expression deformations, rigid-rotations and visual field location). This modulation occurred irrespective of stimulus object category. Although the stimuli were static images, MEG source reconstruction of the early latency signal (N/M170) localized expectancy violation signals to brain areas associated with motion perception. Our findings suggest that the N/M170 can index mismatches between predicted and actual visual inputs in a system that predicts trajectories based on ongoing context. More generally we suggest that the N/M170 may reflect a “family” of brain signals generated across widespread regions of the visual brain indexing the resolution of top-down influences and incoming sensory data. This has important implications for understanding the N/M170 and investigating how the brain represents context to generate perceptual predictions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biological Psychology - Volume 125, April 2017, Pages 45-57
نویسندگان
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