Spontaneous High-Gamma Band Activity Reflects Functional Organization of Auditory Cortex in the Awake Macaque
Bruno B. Averbeck
- Primate Electrode
- Surface Electrode
In the absence of sensory stimuli, spontaneous activity in the brain has been shown to exhibit orga- nization at multiple spatiotemporal scales. In the macaque auditory cortex, responses to acoustic stimuli are tonotopically organized within multiple, adjacent frequency maps aligned in a caudorostral direction on the supratemporal plane (STP) of the lateral sulcus. Here, we used chronic microelectro- corticography to investigate the correspondence between sensory maps and spontaneous neural fluctuations in the auditory cortex. We first mapped tonotopic organization across 96 electrodes span- ning approximately two centimeters along the primary and higher auditory cortex. In separate sessions, we then observed that spontaneous activity at the same sites exhibited spatial covariation that reflected the tonotopic map of the STP. This ob- servation demonstrates a close relationship between functional organization and spontaneous neural activity in the sensory cortex of the awake monkey.
Fukushima, Makoto et al. “Spontaneous High-Gamma Band Activity Reflects Functional Organization of Auditory Cortex in the Awake Macaque.” Neuron 74.5 (2012) : 899-910. Neuron doi:10.1016/j.neuron.2012.04.014 (volume 74 issue 5 pp.899 - 910)
National Institutes of Health