Bibliografia. Jürgen Untermann -Die venetischen Personennamen.

73 (3-4) Jun.-Dez. 1963, p. 483-486

Draughtsmen at work

To obtain the representation of a contour, the visual system integrates fragments of a pattern. One of the `binding rules' governing this process requires that a path of conjunction in which contrast polarity is preserved be followed. Here we show that this rule has a corollary: where two alternative paths compete to emerge in opposite directions, the one with greater contrast luminance is likely to prevail

Newcomers Training as an Opportunity for Improved Knowledge Management and some Controversial Aspects of Apprenticeship

A very efficient process of temporary workers introduction and training will be documented. It will be stressed how newcomers can represent an opportunity for improved knowledge management. At the end of the paper some controversial aspects of apprenticeship and temporary jobs, deserving more research efforts, will be put forward

Boundary completion, contrast polarity and the perception of illusory tilt

What we perceive as a unitary object can be the result of integrative processes that generate a whole from parts. Although this issue of visual perception has been widely explored, recent experimental findings demonstrate that our knowledge is still incomplete. In particular, the question whether contour binding is affected by the sign of contrast (contrast polarity) across edges requires more in-depth examination. Here we show the effects of edge bindings that origi- nate from the merging of laterally displaced edges with the same contrast polarity. We have studied a particular context in which such effects may emerge: a checkerboard with a series of alternated dark and light shapes superimposed on the corners of the squares. The phenomenal observations and experimental findings support the theories according to which boundary completions are originated by phenomena of edge propagation within a `field of completion' (eg Shipley and Kellman, 2003 Perception 32 985 ^ 999) adjacent to an edge ending. Our findings conform to the Shipley and Kellman theory that boundary completion results from the inter- action of edges as well as from edges and shapes lacking in oriented contours, the latter serving as `receiving units', anchoring the paths of activations generated by oriented edges. We propose to integrate this theory with the hypothesis that interactions sensitive to the contrast sign gener- ate conjunction paths of edges that alter their perceived orientation. Based on this perspective we propose an alternative account for the Cafe\ua8 Wall illusion that can be extended to other phenomena of orientation misperception and to a Cafe\ua8 Wall inversion effect that has not been observed previous

Technologies for training and intentional stance

Interactions with digital technologies can be based on the adoption of relational strategies which assume that these technologies have mental states. There are at least two reasons to support the hypothesis that intentional stance is the priority relational strategy. First, the evolutionary path that, at an individual level, leads us to take on a design stance towards artifacts and which appears slower, and later, than that relating to the intentional stance. Second, the fact that the recognition of interactive digital technologies as simple artifacts is something that requires commitment and is not immediate: when overloaded we can slide from design stance towards intentional stance