Abstract
Area 8B may be treated as part of either the prefrontal cortex or the premotor cortex. Previous investigations showed an involvement of area 8B in both eye and ear motor control and in auditory perception. In this report, we studied 139 neurons in three macaque monkeys of these, 32 neurons showed an activity related to environmental auditory stimuli. Fifteen cells with auditory characteristics (15/32) presented a firing discharge inhibited during the execution of visual fixation. The remaining 107 units presented complex or indefinable behaviour. The presence of auditory environmental cells which activity is related prevalently to the voice of persons (researchers) suggests that area 8B may be an area involved in auditory cross-modal association, in natural behaviour. The inhibitory effects during visual fixation suggest that area 8B is part of the inhibitory network preventing the gaze shift in relation to an auditory stimulus. This may be the consequence of the engagement of attention during fixation that may affect the auditory perception. Both aspects indicate that area 8B is involved in high cognitive processes in auditory and orienting processes.
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Acknowledgements
We thank Dr. G. Franchi for his helpful advices; Dr. V. Lolli, Dr. F. Maida and Mr. V. Molino for animal care. Grants were provided by Universita’ di Modena e Reggio Emilia.
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We dedicate this paper to Prof. Massimo Matelli, an Italian Neuroanatomist who devoted his life to scientific research.
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Bon, L., Lucchetti, C. Auditory environmental cells and visual fixation effect in area 8B of macaque monkey. Exp Brain Res 168, 441–449 (2006). https://doi.org/10.1007/s00221-005-0197-5
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DOI: https://doi.org/10.1007/s00221-005-0197-5