Visualization of Brain Activation During Attention-Demanding Tasks Using Cognitive Signal Processing

Visualization of Brain Activation During Attention-Demanding Tasks Using Cognitive Signal Processing

Muthumeenakshi Subramanian (SSN College of Engineering, Chennai, India), B. Geethanjali (SSN College of Engineering, Chennai, India), N.P. Guhan Seshadri (SSN College of Engineering, Chennai, India), Bhavana Venkat (SSN College of Engineering, Chennai, India) and R. Vijayalakshmi (SSN College of Engineering, Chennai, India)
DOI: 10.4018/IJCINI.2017010105
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Abstract

Attention is the primary cognitive process to induce a response to a stimulus. The present study aims at evaluating the activation of different brain regions while performing an attention requiring task. The analysis is achieved with the help of electroencephalography (EEG) recorded simultaneously during the entire period of execution of task. The relative theta and gamma power were significantly higher (p=0.05) during task when compared to rest, whereas in alpha band the relative power was significantly higher (p=0.05) during rest when compared to task. Event related synchronization (ERS) and Event Related Desynchronization (ERD) in relative theta power and relative alpha power respectively was observed particularly in the parietal electrodes (associated with attention). Theta synchronisation and alpha desynchronization is associated with good performance further supported by the task performance with minimal errors. These event-related changes helped sustain attention and visualization of the activated brain regions was accomplished for a better depiction of the findings.
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Methodology

Subject Selection

Ten normal, healthy adults (6 males and 4 females), aged 18-25 volunteered for the study without prior knowledge of the task selected for the study(VCPT) (Markovska-Simoska & Pop-Jordanova, 2009). The subjects were asked to undertake the Mini Mental Status Examination, and their performance was evaluated. Subjects who have scored above 24 out of a total of 30 points were admitted into the experiment. This procedure was carried out in order to ensure that the chosen subjects did not have any cognitive impairment. The flowchart of the complete methodology is represented in Figure 1. The experiment was conducted following the procurement of an informed consent from each of the participants.

Figure 1.

Flowchart depicting the methodology followed in the experiment

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