Related Experiment Video
Updated: Aug 17, 2026

Chronic Implantation of Whole-cortical Electrocorticographic Array in the Common Marmoset
Published on: February 1, 2019
Functional organization and hemispheric comparison of primary auditory cortex in the common marmoset (Callithrix
Bénédicte Philibert1, Ralph E Beitel, Srikantan S Nagarajan
1Coleman Memorial Laboratory and W.M. Keck Center for Integrative Neuroscience, Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, San Francisco, California 94143-0732, USA.
Abstract:
Hemispheric fine-grain maps of primary auditory cortex (AI) were derived from microelectrode penetrations in the temporal gyrus of the common marmoset (Callithrix jacchus) to 1) compare the functional organization of AI in the marmoset with other mammalian species and 2) compare the right and left AI maps in individual monkeys. Frequency receptive fields (FRFs) were recorded with pure tones. Five FRF parameters were analyzed: characteristic frequency, threshold, sharpness of tuning 10 dB and 40 dB above threshold, and minimum response latency. The present study confirms that the functional organization of AI is characterized by a robust tonotopic frequency gradient overlaid with spatially clustered distributions of other FRF parameters. Globally, this functional organization of AI in the common marmoset is similar to that in other mammalian species. With respect to within-subject hemispheric comparisons of the five FRF parameters, a coherent pattern of asymmetry is not evident in marmoset AI. The overall results indicate that the basic functional organization between hemispheres is similar but not identical.
Related Concept Videos
Cerebral Hemispheres
Motor and Sensory Areas of the Cortex
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Lobes of the Cerebrum
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements.
Lateralization
Somatosensory, Motor, and Association Cortex
Association Areas of the Cortex
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

