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Paper   IPM / Cognitive Sciences / 16776
School of Cognitive Sciences
  Title:   A temporal hierarchical feedforward model explains both the time and the accuracy of object recognition
  Author(s): 
1.  H. Heidari-Gorji
2.  R. Ebrahimpour
3.  S. Zabbah
  Status:   Published
  Journal: Scientific Reports
  Year:  2021
  Editor:  11
  Supported by:  IPM
  Abstract:
Brain can recognize different objects as ones it has previously experienced. The recognition accuracy and its processing time depend on different stimulus properties such as the viewing conditions, the noise levels, etc. Recognition accuracy can be explained well by different models. However, most models paid no attention to the processing time, and the ones which do, are not biologically plausible. By modifying a hierarchical spiking neural network (spiking HMAX), the input stimulus is represented temporally within the spike trains. Then, by coupling the modified spiking HMAX model, with an accumulation-to-bound decision-making model, the generated spikes are accumulated over time. The input category is determined as soon as the firing rates of accumulators reaches a threshold (decision bound). The proposed object recognition model accounts for both recognition time and accuracy. Results show that not only does the model follow human accuracy in a psychophysical task better than the well-known non-temporal models, but also it predicts human response time in each choice. Results provide enough evidence that the temporal representation of features is informative, since it can improve the accuracy of a biologically plausible decision maker over time. In addition, the decision bound is able to adjust the speed-accuracy trade-off in different object recognition tasks.

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