Is it really search or just matching? The influence of goodness, number of stimuli and presentation sequence in same-different tasks

The Goodness of Garner dot patterns has been shown to influence same-different response times in a specific way, which has led to the formulation of a memory search model of pattern comparison. In this model, the space of possible variations of each pattern is searched separately for each pattern in the comparison, resulting in faster response times for patterns that have fewer alternatives. Compared to an alternative explanation based on stimulus encoding plus mental rotation, however, the existing data strongly favor this explanation. To obtain a more constraining set of data to distinguish between the two possible accounts, we extended the original paradigm to a situation in which participants needed to compare three, rather than two patterns and varied the way the stimuli were presented (simultaneously or sequentially). Our findings suggest that neither the memory search nor the encoding plus mental rotation model provides a complete description of the data, and that the effects of Goodness must be understood in a combination of both mechanisms, or in terms of cascades processing

EUD survival in the wild :Evaluation challenges for field deployments and how to address them

\u3cp\u3eThis chapter discusses methodological choices facing researchers wishing to evaluate end user development technologies. While laboratory evaluations or short term evaluations are often conducted as a way to validate an end user development technology, these do not provide sufficient guarantees regarding the adoption of end user development practices and how systems should be improved to encourage such practices. The challenges pertaining to field deployments are discussed first at an operational level and second at a teleological level where we debate what should be success criteria for such studies. Discussing previous studies and our experiences from a deployment case in the healthcare sector, we propose guidelines for the evaluation of EUD technologies.\u3c/p\u3