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conflict_monitoring_and_stimulus_selection [2015/09/04 18:29] admin |
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| From the conflict effect, it has been concluded that the monitoring of response conflict (i.c., its detection and subsequent resolution) is an automatic process, triggered by stimulus incongruency. However, there is no conclusive evidence for the automaticity of this process. As an alternative hypothesis, I put forward that people can typically make use of spatial attention to //prevent// response conflict. Therefore, I predict that, when spatial attention is deployed to one of the stimulus components, the conflict effect is no longer observed. | From the conflict effect, it has been concluded that the monitoring of response conflict (i.c., its detection and subsequent resolution) is an automatic process, triggered by stimulus incongruency. However, there is no conclusive evidence for the automaticity of this process. As an alternative hypothesis, I put forward that people can typically make use of spatial attention to //prevent// response conflict. Therefore, I predict that, when spatial attention is deployed to one of the stimulus components, the conflict effect is no longer observed. | ||
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| - | To investigate this hypothesis, we will use a novel experimental paradigm. In this paradigm, the participant fixates a dot at the centre of the screen while stimulus streams are presented in the left and the right visual field. These streams are composed of stimuli that change continuously over the course of time. There are two stimulus categories, and here we assume them to be letters and digits. The participant responds using two buttons, one for his left and one for his right hand. Each of the two buttons is associated to one stimulus category (letters or digits), and the participant has to press this button when the fixation dot increases size (the so-called //go-signal//). A snapshot of an example stimulus stream is shown in Figure 1. Over the course of time, the stimulus streams change, with letters being replaced by digits or other letters, and vice versa for digits that are being replaced. | ||
| {{:slide07.jpg?400 |Snapshot of an example stimulus stream}} | {{:slide07.jpg?400 |Snapshot of an example stimulus stream}} | ||
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| + | To investigate this hypothesis, we will use a novel experimental paradigm. In this paradigm, the participant fixates a dot at the centre of the screen while stimulus streams are presented in the left and the right visual field. These streams are composed of stimuli that change continuously over the course of time. There are two stimulus categories, and here we assume them to be letters and digits. The participant responds using two buttons, one for his left and one for his right hand. Each of the two buttons is associated to one stimulus category (letters or digits), and the participant has to press this button when the fixation dot increases size (the so-called //go-signal//). A snapshot of an example stimulus stream is shown in Figure 1. Over the course of time, the stimulus streams change, with letters being replaced by digits or other letters, and vice versa for digits that are being replaced. | ||
| At any point in time, one of the two stimulus streams indicates the hand (left or right) with which the participant must press the corresponding button after the go-signal (an increase in the size of the fixation dot). This is called the //relevant// stimulus stream. The relevant stimulus stream is indicated by the colour of the fixation dot, for example, with yellow denoting left and blue denoting right. The colour of the fixation dot is called the //cue//. The two stimulus streams can present conflicting information (a letter in one stream and a digit in the other), and the question now is whether this increases the RT as compared to when no conflicting information is presented (two letters or two digits). The hypothesis in this project is that will not be case if their is uncertainty in the information provided by the cue. To manipulate this uncertainty, we will change the cue in the course of the trial. Thus the fixation dot colour continuously changes in the course of a trial, instructing the participant to switch his attention from left-to-right and vice versa. These changes force the participant to be continuously engaged in the course of a trial. These continuous changes in the stimulus streams and the attentional cue mimic the continuous changes in sensory input in daily life, as well the behavioural relevance of this input. | At any point in time, one of the two stimulus streams indicates the hand (left or right) with which the participant must press the corresponding button after the go-signal (an increase in the size of the fixation dot). This is called the //relevant// stimulus stream. The relevant stimulus stream is indicated by the colour of the fixation dot, for example, with yellow denoting left and blue denoting right. The colour of the fixation dot is called the //cue//. The two stimulus streams can present conflicting information (a letter in one stream and a digit in the other), and the question now is whether this increases the RT as compared to when no conflicting information is presented (two letters or two digits). The hypothesis in this project is that will not be case if their is uncertainty in the information provided by the cue. To manipulate this uncertainty, we will change the cue in the course of the trial. Thus the fixation dot colour continuously changes in the course of a trial, instructing the participant to switch his attention from left-to-right and vice versa. These changes force the participant to be continuously engaged in the course of a trial. These continuous changes in the stimulus streams and the attentional cue mimic the continuous changes in sensory input in daily life, as well the behavioural relevance of this input. | ||
conflict_monitoring_and_stimulus_selection.txt ยท Last modified: 2015/09/18 12:02 by admin
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