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We obtain the exact critical relaxation time L ( ), where is the bulk correlation length, for the Glauber kinetic Ising model of spins on a one-dimensional lattice of finite length L for both periodic and free boundary conditions ͑BC's͒. We show that, independent of the BC's, the dynamic critical exponent has the well-known value zϭ2, and we comment on a recent claim that zϭ1 for this model. The ratio L ( )/ ϱ ( ), in the double limit L, →ϱ for fixed xϭL/ , approaches a limiting functional form, f (L/ ), the finite-size scaling function.

A scene prime can induce a mental representation of layout that is functional in the sense that it facilitates the processing of depth relations in a subsequent same-scene target. Five experiments indicated that the representation can consist of separate and independent functional regions. In each experiment, primes with as many as four unrelated regions facilitated spatial processing within each region. The prime representations were functional despite structural discontinuity at region borders. The results indicate a limitation in the importance of structural constraint in representations of scene layout. However, when structural disruption occurred within regions that were perceived (Experiment 5), spatial processing was slowed. The results suggest that scene representation is more top down than is scene perception; the effects of structural disruption were overcome within representations, but not within perception.

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