Players c attentional selection objects attention can

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players C. Attentional Selection: Objects Attention can enhance the processing of a specific type of stimulus Fusiform face area (FFA): An area in the fusiform gyrus of human extrastriate cortex that responds preferentially to faces according to fMRI studies Parahippocampal place area (PPA): A region of cortex in the temporal lobe of humans that appears to respond strongly to images of places (as opposed to isolated objects) Response Enhancement in Objects Attention to object enhances response in different pieces of the cortex that are activated by faces and by places
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12 C. Attentional Selection: Summary Attention is not a “thing”. It’s a mechanism that modulates the processing of neurons that have a particular response properties. Attention works at whatever stage of processing that makes the most sense for your goals: spatial locations, simple features, objects… It does this by changing the “gain” of the neurons. Think of this as turning up the volume on the response of those neurons so that their voices are louder or clearer. Different types of attention also have different limits. In spatial attention, endogenous shifts of attention have a different time course from exogenous shifts. In feature search, the difficulty of finding the target is determined by the number of non-targets that are visually similar. Attention also has limits in the speed of recovery (especially in vision). This is demonstrated by the attentional blink. You can think of this as a limitation in the how rapidly attention can sample the stimulus stream, once something has been picked up. Interestingly, some of you have faster recover times than others. Video gamers appear to be one such population.
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  • Winter '07
  • D.Whitney
  • Fusiform Gyrus, attentional selection, Helmholtz Experiment

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