jueves, 7 de noviembre de 2013


On the Human Processor Model (HPM) and Fitts' law. This module calls strongly for interdisciplinary cooperation and this is what I can highlight of the whole the most; Card, Moran and Newell in the article suggested for this session, that common mental tasks can be improved and analyzed with the support and assistance of collateral sciences, such as cognitive psychology. This is true in terms not only of prediction and understanding but also engineering and planning, designing  as we are concerned about as well. To the same extent the law on movement we studied and in general the chapter seemed very limited and contradictory so, since the background message I got was the expansion onto other fields, and integration. The limits I perceive are those regarding the very narrow aspects studied by Fitts while its context is so vast. The realization that time needed to complete a cycle between cognition, recognition, decision making and action is far too mechanical and equalizing. What about variables affecting that activity or rather behaviour? Emotions (one could be in a bad mood and disturbed, confused, annoyed, tired, etc. affecting also one's performance), free will (training, determination, etc.), special skills (being stronger, sharper, with longer fingers, etc.), and other facilitators/obstacles (the lights are dim, a neuralgia, improper settings, bad postures, lack of interest, distracting stimuli, etc.) could play a determining role on those. Moreover, some are factors a designer could not possibly control outside an experiment, so I wonder if sometimes we do not waste time when focusing on the not-so-important bits; or maybe a timing response and accuracy are priorities set for the design of interactive environments and interfaces, and I have not yet known it. Three variables, therefore, do not seem enough. I would consider the data of course, and it is always valuable, but contrasted with a multitude of other studies, In this one, I would suggest mentioning the error factor affecting the calculations, at least I did not find reasoning on that.

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