**Hippocampal Theta Activity During Stimulus Discrimination Task Discrimination Task**

**Hippocampal Theta Activity During Stimulus** 

DOI: 10.5772/intechopen.68461

Yuya Sakimoto and Dai Mitsushima Additional information is available at the end of the chapter

Yuya Sakimoto and Dai Mitsushima

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.68461

#### **Abstract**

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The configural association theory and conflict resolution model both propose that hippocampal function plays role in the solving a negative patterning task but not simple discrimination task. Some hippocampal lesion study showed that inactivity of rats' hippocampal CA1 area induced impairment of performance of a negative patterning task. Other previous studies, however, showed that the lesion did not affect the performance of the task. Thus, it did not reveal whether hippocampal function was important for solving the negative patterning task. Our recent research using an electrophysiological approach showed that the hippocampal theta power decreased with a compound stimulus of a negative patterning task, and that the hippocampal theta power was decreased by a compound stimulus of a feature negative task. These results indicate that a decrease in hippocampal theta activity is elicited by behavioral inhibition for conflict stimuli with overlapping elements. This finding strongly supports the conflict resolution model and suggests a hippocampal role in learning behavioral inhibition for conflict stimuli during nonspatial stimulus discrimination tasks.

**Keywords:** hippocampal theta power, negative patterning task, feature negative task, configural association theory, conflict resolution model
