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Toward a Neurophysiologically-based Theory of Eye Movement Control During Reading ( )

Toward a Neurophysiologically-based Theory of Eye Movement Control During Reading

Yang & McConkie (Vision Research, in press) describe the beginnings of a theory of eye movement control during reading, based on a neurophysiological framework of eye movement control proposed by Findlay & Walker (1999, Brain & Behavior Science). This paper will develop the theory more fully, describing, in terms of activation and inhibition within the oculomotor system, the normal operation of eye movement control during reading, possible ways in which eye behavior is modified in response to task and stimulus characteristics, and how the system responds to processing difficulties. The paper will describe how certain puzzling observations can be explained within this theory (i.e., the many saccades that are uninfluenced by current stimulus characteristics, lack of a relation between fixation duration and whether a word is skipped, relatively flat hazard curve for longer fixation durations). It will also point out issues that arise within the frame of reference of this type of theory, such as the time course of the onset and dissipation of saccade inhibition when processing difficulties are encountered, and how activation and inhibition influence saccade length and direction.

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