The role of first- and second-order stimulus features for human overt attention.

نویسندگان

  • Hans-Peter Frey
  • Peter König
  • Wolfgang Einhäuser
چکیده

When processing complex visual input, human observers sequentially allocate their attention to different subsets of the stimulus. What are the mechanisms and strategies that guide this selection process? We investigated the influence of various stimulus features on human overt attention--that is, attention related to shifts of gaze with natural color images and modified versions thereof. Our experimental modifications, systematic changes of hue across the entire image, influenced only the global appearance of the stimuli, leaving the local features under investigation unaffected. We demonstrated that these modifications consistently reduce the subjective interpretation of a stimulus as "natural" across observers. By analyzing fixations, we found that first-order features, such as luminance contrast, saturation, and color contrast along either of the cardinal axes, correlated to overt attention in the modified images. In contrast, no such correlation was found in unmodified outdoor images. Second-order luminance contrast ("texture contrast") correlated to overt attention in all conditions. However, although none of the second-order color contrasts were correlated to overt attention in unmodified images, one of the second-order color contrasts did exhibit a significant correlation in the modified images. These findings imply, on the one hand, that higher-order bottom-up effects--namely, those of second-order luminance contrast--may partially account for human overt attention. On the other hand, these results also demonstrate that global image properties, which correlate to the subjective impression of a scene being "natural," affect the guidance of human overt attention.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

بررسی ویژگی‌های ظاهری، ساختاری و محتوایی وب‌سایت‌های نشریات علمی – پژوهشی ایران

Aim:  The aim of this study is to examine the characteristics, structure and content of the 858 websites of Scientific – Research publications in Iran. Methodology:  this research has been done with the evaluative and web metric approach by using a checklist developed by the researcher (94 elements). Finding: findings show that in appearance features  3 elements including Use bright color...

متن کامل

Differences of monkey and human overt attention under natural conditions

Rhesus monkeys are widely used as animal models of human attention. Such research rests upon the assumption that similar mechanisms underlie attention in both species. Here, we directly compare the influence of low-level stimulus features on overt attention in monkeys and humans under natural conditions. We recorded eye-movements in humans and rhesus monkeys during free-viewing of natural image...

متن کامل

The relation of phase noise and luminance contrast to overt attention in complex visual stimuli.

Models of attention are typically based on difference maps in low-level features but neglect higher order stimulus structure. To what extent does higher order statistics affect human attention in natural stimuli? We recorded eye movements while observers viewed unmodified and modified images of natural scenes. Modifications included contrast modulations (resulting in changes to first- and secon...

متن کامل

An Emotion Recognition Approach based on Wavelet Transform and Second-Order Difference Plot of ECG

Emotion, as a psychophysiological state, plays an important role in human communications and daily life. Emotion studies related to the physiological signals are recently the subject of many researches. In This study a hybrid feature based approach was proposed to examine affective states. To this effect, Electrocardiogram (ECG) signals of 47 students were recorded using pictorial emotion elici...

متن کامل

پیش‌بینی سانحه‌پذیری از خطاهای توجه در رانندگان

Purpose: there is idea in society that some people have more accidents because they are more accident vulnerable. Usually, characteristics related to accident vulnerability are surveyed in researches’ backgrounds. But at this research influence of a human factor, attention in occurrence of dangerous behaviors, is studied. Methods: statistical population was 140 drivers of a transportation compa...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Perception & psychophysics

دوره 69 2  شماره 

صفحات  -

تاریخ انتشار 2007