Covert Perceptual Capability Development

On-line Learning for Covert and Overt Perceptual Capability for Vision-based Navigation

In this paper, we propose a model to develop robots’ covert and overt perceptual capabilities using reinforcement and supervised learning. Covert perceptual behaviors are treated as actions selected by a motivational system. Overt perceptual behaviors can be learned using either supervised or reinforcement learning. We apply this model to the visionbased navigation system. Instead of dealing wi...

DST approach to enhance audio quality on lost audio packet steganography

Lost audio packet steganography (LACK) is a steganography technique established on the VoIP network. LACK provides a high-capacity covert channel over VoIP network by artificially delaying and dropping a number of packets in use to convey stegnogram. However, the increasing loss of packets will hurt the quality of the VoIP service. The quality deterioration will not only affect the legitimate V...

Analysing the Information Flow Properties of Object-Capability Patterns

We consider the problem of detecting covert channels within security-enforcing object-capability patterns. Traditional formalisms for reasoning about the security properties of object-capability patterns require one to be aware, a priori, of all possible mechanisms for covert information flow that might be present within a pattern, in order to detect covert channels within it. We show how the C...

A Role of Eye Vergence in Covert Attention

Covert spatial attention produces biases in perceptual and neural responses in the absence of overt orienting movements. The neural mechanism that gives rise to these effects is poorly understood. Here we report the relation between fixational eye movements, namely eye vergence, and covert attention. Visual stimuli modulate the angle of eye vergence as a function of their ability to capture att...

Spatial Covert At tention: Perceptual Modul ation