This study examined whether piglet distress vocalizations vary with age, body weight and health status, according to the predictions of the honest signalling of need evolutionary model. Vocalizations were recorded during manual squeezing (a simulation of being crushed by mother sow) and during isolation on Days 1 and 7 after birth in piglets from 15 litters. We predicted that during squeezing, ...

A promising technique used in some planning systems to improve their performance is the use of domain dependent search control knowledge. We present a procedure for compiling search control knowledge, expressed declaratively in a logic, into the preconditions of the plan actions (operators). We do this within the framework of the situation calculus by introducing a transformation of nonMarkovia...

Reasoning about perception of depth and about spatial relations between moving physical objects is a challenging problem. We investigate the representation of depth and motion by means of depth profiles whereby each object in the world is represented as a single peak. We propose a logical theory, formulated in the situation calculus (SC), that is used for reasoning about object motion (includin...

By using an example from a robot navigating domain, we argue that to specify declaratively the behavior of an agent, we need to have a formal and explicit notion of \quality plans." To that end, we propose the following three domain independent measures of plan quality: a plan is said to be A-minimalif none of the actions in it can be deleted and have it continue to be a plan; it is said to be ...

We present a declarative formalization of STRIPS [1] as a reasoning strategy in the situation calculus [10]. The idea is to use logic not only to represent planning problems, but also to describe the mental situations, mental actions and reasoning strategy STRIPS uses to solve those problems.

In this paper we study the diierences between two logic theories for temporal reasoning, the Situation Calculus and the Event Calculus, and the implications of these diierences. We construct a new formalism that combines the advantages of both Situation and Event Calculus and avoids the problems of either. The new formalism is useful for general temporal reasoning in worlds with discrete and co...

In this study we sought to determine whether dog barks could be divided into subtypes based on context. We recorded barking from 10 adult dogs, Canis familiaris, of six breeds in three different test situations: (1) a disturbance situation in which a stranger rang the doorbell, (2) an isolation situation in which the dog was locked outside or in a room isolated from its owner and (3) a play sit...

The review analyzes the experiments on perceptual isolation with special reference to the phenomena of reported visual and auditory sensations. Variables analyzed include: methods of confinement and restriction, conditions of illumination, duration of isolation, set, instructions and suggestions , reporting or verbalization instructions, sleep, subject populations, prior knowledge and expectati...

The review analyzes the experiments on perceptual isolation with special reference to the phenomena of reported visual and auditory sensations. Variables analyzed include: methods of confinement and restriction, conditions of illumination, duration of isolation, set, instructions and suggestions , reporting or verbalization instructions, sleep, subject populations, prior knowledge and expectati...