قیمت محصول :     10000 تومان
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سبد خرید

  • سبد خریدتان خالی است.
  • تاریخ ارائه محصول : 09 / 08 / 2019
  • بازدید : 58 بار
  • دسته بندی :
  • امتیاز کاربران :

Brain State Dependent Role of Attention in Perceptual Processing

Brain State Dependent Role of Attention in Perceptual Processing and Decision Making

Attention to a specific target or location in visual space enhances the baseline activity of the cells representing the target or the spatial location. Attention can also be directed based on the expectations. Attention mediated enhanced baseline activity is correlated with improved object recognition. To explore the relation of visual attention with neural baseline activity, cortical sensory processing and the behavioral choice we recorded the activity of single cells in the inferior temporal cortex of monkeys during two different tasks. The tasks were a passive fixation and a two-alternative forced choice categorization of noisy body and object images. We found enhanced neural activity in categorization task compared to the passive fixation task. Both body and object selective cells showed significantly more response enhancement for their preferred category compared to the non-preferred category. No such response enhancement was observed in trials when the monkeys made a wrong choice in the categorization task. Magnitude of the response enhancement was larger for more noisy stimuli. More importantly, in trials with high baseline activity responses of body selective and object selective cells to body images were enhanced and suppressed, respectively. We also found decreased neural response variability in the categorization compared to the passive task. Larger effects were observed at higher noise levels. By measuring choice probability we found that neural firing rate was correlated with monkeys’ choice, particularly in trials with high baseline activity. We suggest that attentional enhancement of IT cells’ baseline firing rate is correlated with improved neural response reliability and category selectivity. These effects are dependent on the cells’ category selectivity, attentional load and the exact time of baseline activity increase.

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