Previous results suggest that the brain predominantly relies on a constantly updated gaze-centered target representation to guide reach movements when no other visual information is available. In the present study, we investigated whether the addition of reliable visual landmarks influences the use of spatial reference frames for immediate and delayed reaching. Subjects reached immediately or a...

Previous literature has shown that spatial anxiety relates to navigation abilities (Hund & Gill, 2014). How spatial anxiety effects the spatial-temporal perception of one’s environment is not well known. The present student aimed to examine how spatial anxiety related to the memory of distances and time to landmarks in the surrounding area. Participants completed a battery of navigation questio...

Route directions describe the sequence of actions a moving person needs to take to reach a goal in an environment. When generating directions, speakers not only specify what to do. They also refer to landmarks located along the route. We report two studies intended to identify the cognitive functions of landmarks. In the first study, participants learned a route in an urban environment. They th...

|We describe a team of robots that uses a trail of landmarks to navigate between places of interest. The landmarks are not physical; they are waypoint coordinates generated online by each robot and shared with team-mates over the network. Waypoints are speci ed with reference to features in the world that are relevant to the team's task and common to all robots. Using such task-level features a...

Visual attention regions are useful for many applications in the field of computer vision and robotics. Here, we introduce an application to simultaneous robot localization and mapping. A biologically motivated attention system finds regions of interest which serve as visual landmarks for the robot. The regions are tracked and matched over consecutive frames to build stable landmarks and to est...

The paper is dedicated to determination of equipped with a video camera unmanned mobile object (e.g., a mobile robot) orientation by natural landmarks. The problem is relevant for solving the problem of autonomous movement of the mobile object at a given point of navigating using natural landmarks linked to the map location. The algorithm for determining the orientation of an unmanned mobile ob...

We compare shape changes in mandibles of marsupials, represented by 2-dimensional coordinates, using different subsets of landmarks. We show that use of Type III landmarks, often not recommended in geometric morphometric techniques, might permit a better interpretation of shape changes than use of Type I landmarks alone, or a combination of Types I and II. We suggest that the use of as many lan...

This paper describes a vision-based landmark learning and recognition system for use in mobile robot navigation tasks. The system uses genetic algorithms (GA) for both learning and recognition processes. It is able to learn new landmarks with very little human intervention. The recognition system can read text inside landmarks, when present. This learning ability has been tested with two very d...

In this paper, fast techniques are proposed to achieve real time and robust monocular visual odometry. We apply an iterative 5point method to estimate instantaneous camera motion parameters in the context of a RANSAC algorithm to cope with outliers efficiently. In our method, landmarks are localized in space using a probabilistic triangulation method utilized to enhance the estimation of the la...

This thesis focuses on the detection of abrupt acoustic discontinuities in the speech signal, which constitute landmarks for consonant sounds. Because a large amount of phonetic information is concentrated near acoustic discontinuities, more focused speech analysis and recognition can be performed based on the landmarks. Three types of consonant landmarks are defined according to its characteri...