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:: Volume 4, Issue 3 (Summer - 2016) ::
Shefaye Khatam 2016, 4(3): 1-8 Back to browse issues page
The Influence of Past Decision Information on Decision Making in the Present
Farzaneh Olianezhad , Sajjad Zabbah , Reza Ebrahimpour *
Faculty of Computer Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran , rebrahimpour@srttu.edu
Abstract:   (1814 Views)

Introduction: Decision process is an accumulation-to-bound mechanism, in which momentary sensory evidence is accumulated over time toward a criterion level. This bounded evidence accumulation is represented in the activity of neurons in the lateral intraparietal (LIP) cortex. Whether the firing rate of LIP neuron contains post decision information (PDI) or returns to baseline level as soon as decision made needs to be clarified. Materials and Methods: To investigate this issue, we conducted behavioral experiments based on the two forced-choice discrimination of motion direction. Human subjects reported the net direction of stochastic random dot motion by pressing a key of specified keys associated with the two possible directions of motion. Trials were separated by different time gaps. Results: Results showed that there is a preference in subjects to make a same decision as their pervious decision, especially in weak stimuli. Conclusion: Our findings suggest that the value of decision variable (DV) after crossing the bound (named PDI) may accumulate with DV for the next decisions.

Keywords: Decision Making, Psychophysics, Neurosciences
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Type of Study: Research --- Open Access, CC-BY-NC | Subject: Basic research in Neuroscience

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Olianezhad F, Zabbah S, Ebrahimpour R. The Influence of Past Decision Information on Decision Making in the Present. Shefaye Khatam. 2016; 4 (3) :1-8
URL: http://shefayekhatam.ir/article-1-965-en.html

Volume 4, Issue 3 (Summer - 2016) Back to browse issues page
مجله علوم اعصاب شفای خاتم The Neuroscience Journal of Shefaye Khatam
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