Reply to Morgan

Both separation and eccentricity can limit precise position judgements: a reply to Morgan and Watt.

Weber's law is ubiquitous in position judgements. In a variety of position acuity tasks, the position threshold is proportional to the separation of the reference features. Recently, we (Klein & Levi, 1987; Levi, Klein & Yap, 1988) suggested that two sensory processes may serve to limit position acuity, and thus contribute to Weber's law for position. One is the target separation, and the other...

When is it coevolution? A reply to Morgan-Richards et al

I recently hypothesised that some characteristics of fleshy fruits in New Zealand could result from coevolution with wētā (Burns 2006a). Morgan-Richards et al. (2008) expand on the subject by offering some suggestions on how this hypothesis could be tested and by conducting several small field trials. In the process they argue emphatically against the hypothesis. I am delighted that Morgan-Rich...

Morgan Dean

Introduction Landsat Thematic Mapper ( TM ) imagery was used to analyze patterns of landscape diversity in the seasonal tropical forests of northeastern Guatemala. TM radiance and the radiance coefficient of variation (CV) were significant in discriminating land-cover types. Cluster analysis of TM4, TM5, and TM7 radiance produced six distinct types of landcover. Green leaf biomass from TM4 and ...

The Authors’ Reply

De Morgan Triples Revisited

In this paper we overview basic known results about the varieties generated by De Morgan triples and about the problem to find equations defining the variety generated by a concrete De Morgan triple. We also provide some alternative proofs and some new results, specially for the case of Łukasiewicz De Morgan triples.