کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6203518 1603196 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Visual motion modulates pattern sensitivity ahead, behind, and beside motion
ترجمه فارسی عنوان
حرکت بصری، حساسیت الگوی را به جلو، پشت و کنار حرکت می دهد
کلمات کلیدی
حرکت کدگذاری فضایی، جمع بندی فضایی، برنامه نویسی پیش بینی شده
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
چکیده انگلیسی


- Low contrast targets are easier to detect when they are consistent with a proximate moving pattern.
- This happens in advance, behind, and adjacent to motion and adjacent to flicker.
- This does not happen for a stimulus that sums to grey across a small retinal expanse.
- Results are explicable in terms of a non-predictive spatial summation.

Retinal motion can modulate visual sensitivity. For instance, low contrast drifting waveforms (targets) can be easier to detect when abutting the leading edges of movement in adjacent high contrast waveforms (inducers), rather than the trailing edges. This target-inducer interaction is contingent on the adjacent waveforms being consistent with one another - in-phase as opposed to out-of-phase. It has been suggested that this happens because there is a perceptually explicit predictive signal at leading edges of motion that summates with low contrast physical input - a 'predictive summation'. Another possible explanation is a phase sensitive 'spatial summation', a summation of physical inputs spread across the retina (not predictive signals). This should be non-selective in terms of position - it should be evident at leading, adjacent, and at trailing edges of motion. To tease these possibilities apart, we examined target sensitivity at leading, adjacent, and trailing edges of motion. We also examined target sensitivity adjacent to flicker, and for a stimulus that is less susceptible to spatial summation, as it sums to grey across a small retinal expanse. We found evidence for spatial summation in all but the last condition. Finally, we examined sensitivity to an absence of signal at leading and trailing edges of motion, finding greater sensitivity at leading edges. These results are inconsistent with the existence of a perceptually explicit predictive signal in advance of drifting waveforms. Instead, we suggest that phase-contingent target-inducer modulations of sensitivity are explicable in terms of a directionally modulated spatial summation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vision Research - Volume 98, May 2014, Pages 99-106
نویسندگان
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