Learn More
We examined the flexibility of guidance in a conjunctive search task by manipulating the ratios between different types of distractors. Participants were asked to decide whether a target was present or absent among distractors sharing either colour or shape. Results indicated a strong effect of distractor ratio on search performance. Shorter latency to(More)
In three experiments, participants' visual span was measured in a comparative visual search task in which they had to detect a local match or mismatch between two displays presented side by side. Experiment 1 manipulated the difficulty of the comparative visual search task by contrasting a mismatch detection task with a substantially more difficult match(More)
The distractor-ratio effect refers to the finding that search performance in a conjunctive visual search task depends on the relative frequency of two types or subsets of distractors when the total number of items in a display is fixed. Previously, Shen, Reingold, and Pomplun (2000) examined participants' patterns of eye movements in a distractor-ratio(More)
The Area Activation Model (Pomplun, Reingold, Shen, & Williams, 2000) is a computational model predicting the statistical distribution of saccadic endpoints in visual search tasks. Its basic assumption is that saccades in visual search tend to foveate display areas that provide a maximum amount of task-relevant information for processing during the(More)
The present study employed the gaze-contingent window paradigm to investigate parafoveal and peripheral cueing and masking effects on saccadic selectivity in a triple-conjunction visual search task. In the cueing conditions, the information shown outside the gaze-contingent window was restricted to the feature or feature pair shared between the target and a(More)
We present an approach towards a simple, explicit model of saccadic selectivity in visual search tasks. The model in its present state includes weights for target-distractor similarities and fixation field size as its only adjustable parameters. Based on these, the model predicts the statistical distribution of saccadic endpoints for any given visual search(More)
A cueing paradigm was employed to examine modulation of distraction due to a visual singleton. Subjects were required to make a saccade to a shape-singleton target. A predictive location cue indicated the hemifield where a target would appear. Older adults made more anticipatory saccades than younger adults, and were less accurate for making an eye movement(More)
The present experiment examined the one-target advantage (OTA) with regard to saccadic eye movements. The OTA, previously found with manual pointing responses, refers to the finding that movements are executed faster when the limb is allowed to stop on the target compared to the situation where it has to proceed and hit a second target. Using an adapted(More)
In the present paper, we present a novel gaze-controlled interface. It allows the user to magnify and inspect any part of an image by just looking at the part in question and subsequently shifting gaze to another window. No manual input is required to control this process. The interface was empirically evaluated in a multi-session experiment employing a(More)
The current study examined the relation between the difficulty of central discrimination and the efficiency of peripheral selection in visual search tasks. Participants were asked to search for a target among high-, medium-, and low-similarity distractors. In Experiment 1, while the duration of current fixations increased with increasing target-distractor(More)