● The difference in performance between congruent and incongruent conditions is known as Stroop interference.
● Stroop interference might occur at earlier processing stages because of both semantic and response interferences.
● Findings of this study are consistent with the multiple-stage account approach.

Plain Language Summary 
Various cognitive tasks measure interference between stimulus dimensions such as temporal and spatial dimensions. The most widely used task is the Stroop task. The task was originally developed by Stroop. In this task, subjects see words that denote colors (red, green, blue, and yellow) printed in a corresponding color (e.g. the word red is written in red ink) or in a non-corresponding color (e.g. the word blue is written in red ink) and they are asked to name the ink color while inhibiting the meaning of the word. When the color and the word are congruent, the task is easy; when the color and the word are incongruent, people experience interference. The Stroop interference indicates that Reaction Time (RT) is consistently longer in the incongruent conditions compared to the congruent conditions. In recent years, questions have been raised about the nature of Stroop interference. Several researchers argued that the difference in performance on congruent and incongruent trials could arise from response interference. Studies have claimed that Stroop interference might occur at earlier processing stages related to semantic or conceptual encoding. The present study aims to determine the number and nature of the factors necessary to account for the multiple components of Stroop interference. We used computerized version of the Stroop task adapted to the Iranian population. Our results confirmed that Stroop interference is because of both semantic and response interferences which is consistent with the multiple-stage account approach.