Basis Of Salience Research Articles

All-or-None Context Dependence Delineates Limits of FEF Visual Target Selection

Choices of where to look are informed by perceptual judgments, which locate objects of current value or interest within the visual scene. This perceptual-motor transform is partly implemented in the frontal eye field (FEF), where visually responsive neurons appear to select behaviorally relevant visual targets and, subsequently, saccade-related neurons select the movements required to look at them. Here, we use urgent decision-making tasks to show (1) that FEF motor activity can direct accurate, visually informed choices in the complete absence of prior target-distracter discrimination by FEF visual responses and (2) that such discrimination by FEF visual cells shows an all-or-none reliance on the presence of stimulus attributes strongly associated with saliency-driven attentional allocation. The present findings suggest that FEF visual target selection is specific to visual judgments made on the basis of saliency and may not play a significant role in guiding saccadic choices informed solely by feature content.

Distinguishing among potential mechanisms of singleton suppression.

Previous research has revealed that people can suppress salient stimuli that might otherwise capture visual attention. The present study tests between 3 possible mechanisms of visual suppression. According to first-order feature suppression models, items are suppressed on the basis of simple feature values. According to second-order feature suppression models, items are suppressed on the basis of local discontinuities within a given feature dimension. According to global-salience suppression models, items are suppressed on the basis of their dimension-independent salience levels. The current study distinguished among these models by varying the predictability of the singleton color value. If items are suppressed by virtue of salience alone, then it should not matter whether the singleton color is predictable. However, evidence from probe processing and eye movements indicated that suppression is possible only when the color values are predictable. Moreover, the ability to suppress salient items developed gradually as participants gained experience with the feature that defined the salient distractor. These results are consistent with first-order feature suppression models, and are inconsistent with the other models of suppression. In other words, people primarily suppress salient distractors on the basis of their simple features and not on the basis of salience per se. (PsycINFO Database Record

Motion cues and saliency based unconstrained video segmentation

The segmentation of moving objects become challenging when the object motion is small, the shape of object changes, and there is global background motion in unconstrained videos. In this paper, we propose a fully automatic, efficient, fast and composite framework to segment the moving object on the basis of saliency, locality, color and motion cues. First, we propose a new saliency measure to predict the potential salient regions. In the second step, we use the RANSAC homography and optical flow to compensate the background motion and get reliable motion information, called motion cues. Furthermore, the saliency information and motion cues are combined to get the initial segmented object (seeded region). A refinement is performed to remove the unwanted noisy details and expand the seeded region to the whole object. Detailed experimentation is carried out on challenging video benchmarks to evaluate the performance of the proposed method. The results show that the proposed method is faster and performs better than state-of-the-art approaches.

Salience-based progression of visual attention: Time course

In a visual search task, visual attention progresses from the most to the least salient item until a target is found. The time course of such salience-based progression remains unclear although the temporal deployment seems as crucial as the spatial deployment. The present study investigated how the general hierarchical pattern takes place. Healthy volunteers were presented with a primed visual search paradigm in which the primes consisted of three items differing in salience for either 33, 50 or 100ms. Subsequently one of them became the target and participants had to make a judgment about it. In order to progress on the basis of salience, attention seemed first to be captured by the most salient item. Secondly, the first two most salient items seemed both encompassed within the attentional spotlight. At that time, the least salient item seemed inhibited, completing the stepwise progression of attention. In summary, our data suggest that the hierarchical pattern is built up over time through orienting and expansion of the spotlight, and inhibition of the least salient signals. Furthermore, complementary analyses revealed a proximity effect influencing the selection of the next location to visit. As predicted by different computational models, items located closely to the first visited location were more prone to attract attention than distant items but interestingly enough, this effect only applied to the least salient item suggesting a balance between salience and proximity criteria. Critically also, salience and proximity effects seem to have different time courses. Results are only partially explained by current visual attention models and require further investigation.

"Nudges" to Prevent Behavioral Risk Factors Associated With Major Depressive Disorder.

Major depressive disorder-colloquially called "depression"-is a primary global cause of disability. Current preventive interventions, such as problem-solving therapy, are effective but also expensive. "Nudges" are easy and cheap interventions for altering behavior. We have explored how nudging can reduce three behavioral risk factors of depression: low levels of physical activity, inappropriate coping mechanisms, and inadequate maintenance of social ties. These nudges use cognitive biases associated with these behavioral risks, such as valuing the present more than the future, following the herd or the norm, making different choices in light of equivalent conditions, and deciding on the basis of salience or attachment to status quo.

Three-year-olds understand communicative intentions without language, gestures, or gaze

The communicative interactions of very young children almost always involve language (based on conventions), gesture (based on bodily deixis or iconicity) and directed gaze. In this study, ninety-six children (3;0 years) were asked to determine the location of a hidden toy by understanding a communicative act that contained none of these familiar means. A light-and-sound mechanism placed behind the hiding place and illuminated by a centrally placed switch was used to indicate the location of the toy. After a communicative training session, an experimenter pressed the switch either deliberately or accidentally, and with or without ostension (in the form of eye contact and child-directed speech). In no condition did she orient towards the hiding place. When the switch was pressed intentionally, children used the light-and-sound cue to find the toy – and tended to do so even in the absence of ostensive eye contact. When the experimenter pressed the switch accidentally, children searched randomly – demonstrating that they were tracking her communicative intent, and not merely choosing on the basis of salience. The absence of an effect of ostension contradicts research that ostension helps children to interpret the communicative intentions underlying unfamiliar signs. We explain this by concluding that while it may play a role in establishing a communicative interaction, it is not necessary for sustaining one; and that even with a highly novel communicative act – involving none of the means of communication on which children typically rely – three-year-olds can comprehend the communicative intentions behind an intentionally produced act.

色の重要度に基づくピクセルアートの幾何学的平滑化

色の重要度に基づくピクセルアートの幾何学的平滑化