In multimodal integration and sensorimotor transformation areas of posterior parietal cortex (PPC), neural responses often appear encoded in spatial reference frames that are intermediate to the intrinsic sensory reference frames, e.g., eye-centred for visual or head-centred for auditory stimulation. Many sensory responses in these areas are also modulated by direction of gaze. We demonstrate t...

In multimodal integration and sensorimotor transformation areas of the posterior parietal cortex (PPC), neural responses often appear encoded in spatial reference frames that are intermediate to the intrinsic sensory reference frames, for example, eye-centered for visual or head-centered for auditory stimulation. Many sensory responses in these areas are also modulated by direction of gaze. We ...

Students participated in 3 experiments investigating the use of environment- and action-centered reference frames in selective reaching. They pointed to a green target appearing either with or without a red distractor. Target-distractor distance was manipulated, and distractor interference (difference between distractor trials and no-distractor trials) was measured in reaction time, movement ti...

It has been documented that when memorizing a physical space, the person's mental representation of that space is biased with distortion and segmentation. Two experiments reported here suggest that distortion and segmentation arise due to a hierarchical organization of the spatial representation. The spatial relations associated with salient landmarks are more strongly encoded and easier to rec...

Perceptual aliasing challenges reinforcement learning agents. They struggle to learn stable policies by failing identify and disambiguate perceptually identical states in the environment that require different actions reach a goal. As agent often has only local frame of reference, it cannot represent global environment. Frame-of-reference-based is feature vertebrate intelligence allows multiple...

ions that are not shown include:  The multiple dimension systems of the Person object frame class; these typically include: o A special “component holder” dimension system. o A 4D dimension system (a Cartesian coordinate + time system).  Transforms between the above two dimension systems. Some of the descriptions of definitions in the following sections will refer to this diagram. Structural ...

Migration of legacy systems to service-based systems constitutes a key challenge of service-oriented system engineering, namely rehabilitation of pre-existing enterprise assets while conforming to service engineering principles. Over a decade there has been an increasing interest in the approaches addressing SOA migration. These approaches mainly differ in ‘what is migrated’ and ‘how the migrat...

Games of chance are often used as conceptual models of random processes in nature. For example, an exhibit on the heart in Chicago's Museum of Science and Industry includes a kind of pinball machine. After the balls bounce somewhat randomly through this machine, they fall into bins symbolizing the different states of health of one's heart. One can bias the outcomes for better or for worse by tu...

An absolute plate motion (APM) model is required to address issues such as the thermochemical evolution of Earth’s mantle. All APM models have to rely on indirect inferences, including those based on hot spots and seismic anisotropy, each with their own set of uncertainties. Here, we explore a seafloor spreading-aligned reference frame. We show that this reference frame fits azimuthal seismic a...