Phototropic responses to unilateral ultraviolet stimuli were studied to determine whether the response of one side of the cell is affected by the previous exposure of the opposite side to ultraviolet. It has been found that the direction of bending is not parallel to the stimulus direction, but is along a straight line rotated 17 degrees clockwise from the stimulus direction. This deviation ind...

Parasites may be expected to become locally adapted to their hosts. However, while many empirical studies have demonstrated local parasite adaptation, others have failed to demonstrate it, or have shown local parasite maladaptation. Researchers have suggested that gene flow can swamp local parasite-host dynamics and produce local adaptation only at certain geographical scales; others have argue...

We describe a model for the evolutionary consequences of plasticity in an environmentally heterogeneous metapopulation in which specialists for each of two alternative environments and one plastic type are initially present. The model is similar to that proposed by Moran (1992) but extends her work to two sites. We show that with migration between sites the plastic type is favored over local sp...

Choreographies allow designers to specify the protocols followed by participants of a distributed interaction. Adapting the behavior of a participant, either because of external requests or as a self-update to better suit a changing environment, requires to update in a coordinated way (possibly) all the participants interacting with him. We propose a language able to describe a choreography tog...

Purpose The application of nonlinear spatial encoding magnetic fields for both excitation and geometrically matched encoding (ExLoc [1]) allows the acquisition of curved slices with adjustable shape and thus increases the flexibility of MRI. However, both spatially varying slice thickness and in-plane resolution resulting from the nonlinearity of the fields is an unwanted side effect for most a...

Adaptation to a moving visual pattern induces shifts in the perceived motion of subsequently viewed moving patterns. Explanations of such effects are typically based on adaptation-induced sensitivity changes in spatio-temporal frequency tuned mechanisms (STFMs). An alternative hypothesis is that adaptation occurs in mechanisms that independently encode direction and speed (DSMs). Yet a third po...

abbot is the hybrid connectionist hidden Markov model (HMM) large vocabulary continuous speech recognition system developed at Cambridge University Engineering Department. abbot makes e ective use of the linear input network (LIN) adaptation technique to achieve speaker and channel adaptation. Although the LIN is e ective at adapting to new speakers or a new environment (e.g. a di erent microph...

We study the evolution of inversions that capture locally adapted alleles when two populations are exchanging migrants or hybridizing. By suppressing recombination between the loci, a new inversion can spread. Neither drift nor coadaptation between the alleles (epistasis) is needed, so this local adaptation mechanism may apply to a broader range of genetic and demographic situations than altern...

The self-organizing map (SOM) and neural gas (NG) and generalizations thereof such as the generative topographic map constitute popular algorithms to represent data by means of prototypes arranged on a (hopefully) topology representing map. However, most standard methods rely on the Euclidean metric, hence the resulting clusters are isotropic and they cannot account for local distorsions or cor...

A central prediction of the geographic mosaic theory of coevolution is that coevolving interspecific interactions will show varying degrees of local maladaptation. According to the theory, much of this local maladaptation is driven by selection mosaics and spatially intermingled coevolutionary hot and cold spots, rather than a simple balance between gene flow and selection. Here I develop a gen...