Christina J. Howard

8 mars 2019

Nottingham Trent University, Nottingham, UK

Paying attention to the continuously changing visual world

invitée par Laurent Goffart

abstract : The dynamic nature of the world means that we need to constantly update our visual representations, but the mechanisms by which this occurs are not fully understood. I will present data from a series of studies looking at the processes by which we attend to and encode the changing appearances and positions of visual objects. Although object tracking has been well studied, for example in the Multiple Object Tracking task, the underlying neurophysiological mechanisms of position updating remain poorly understood. I will present data examining the role of individual differences in occipital alpha oscillations in predicting performance on a demanding position updating task. In these experiments, we find that the peak frequency of individuals’ resting alpha oscillations is negatively related to precision of position reports, such that those with lower resting alpha frequency show superior performance. In terms of keeping up to date representations of the appearances of objects, I will present data from healthy younger adults and patients with damage to parietal cortex examining temporal lags in perceptual reports and the time window over which visual information is averaged. I will present data indicating that parietal cortex is implicated in the temporal resolution of attention.

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