Neural mechanism for temporal discrimination of visual and auditory sensory stimuli

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To investigate neuronal mechanism for interval timing, especially for temporal discrimination of sensory stimuli with different modality, we recorded neuronal activity from prefrontal cortex of animals performing a temporal discrimination task using visual and auditory stimuli. Many prefrontal neurons selectively responded to visual and auditory stimuli during stimulus presentation periods while a group of neurons represented relative duration for visual and auditory stimuli in a discrimination decision phase. These results suggest temporal information of visual and auditory stimuli is processed partially in different neuronal networks in prefrontal cortex.