To respond to movements of others and understand the intention of others' actions, it is important to accurately extract motion information from body movements. Here, using original and spatially scrambled point-light biological motions in upright and inverted orientations, we investigated the effect of global and local biological motion information on speed perception and sensitivity. The spee...

Movement duration is an integral component of motor control, but nearly all extant optimization models of motor planning prefix duration instead of explaining it. Here we propose a new optimization principle that predicts movement duration. The model assumes that the brain attempts to minimize movement duration under the constraint of meeting an accuracy criterion. The criterion is task and con...

Behavioral goals are achieved reliably and repeatedly with movements rarely reproducible in their detail. Here we offer an explanation: we show that not only are variability and goal achievement compatible, but indeed that allowing variability in redundant dimensions is the optimal control strategy in the face of uncertainty. The optimal feedback control laws for typical motor tasks obey a “min...

The paper presents unified analytical solution for combining high-frequency and low-frequency economic time-series by additive and proportional Denton methods with parametrical dependence on the initial values of variable and indicator in evident form. This solution spans Denton’s original and Cholette’s advanced benchmarking initial conditions as the subcases. Computational complexity of the o...

The idea of preserving conditional beliefs emerged recently as a new paradigm apt to guide the revision of epistemic states. Conditionals are substantially different from propositional beliefs and need specific treatment. In this paper, we present a new approach to conditionals, capturing particularly well their dynamic part as revision policies. We thoroughly axiom-atize a principle of conditi...

In his account of the mirror principle, Baker (1988) relies crucially on head (X) movement, to which he (compellingly) argues that the GF changing processes can be reduced. This move, along with the head movement constraint (Travis, 1984), allow Baker to account for the mirror principle. Head movement however, seems to have very different properties from phrasal (XP) movement. For example, head...

Lifecycle funds offered to retirement plan participants gradually roll down their exposure to stocks while approaching the target date of retirement. This movement away from equities and towards less volatile assets like bonds and cash is done following an asset allocation principle which emphasizes growth of portfolio in the initial years and preservation in the later years. We show that such ...

Head movement is the case of Move-α where the value of α is X°. As a case of Move-α, standard conditions on movement apply to it. These include locality, structure preservation, and the requirement that movement leave a well-formed trace. The principal locality condition on head movement is the Head Movement Constraint (HMC), originally proposed by Travis (1984) and given informally in (1): (1)...