Interconnections of auditory areas in the guinea pig neocortex

Experimental Brain Research
M N WallaceA R Palmer

Abstract

By studying the efferent projections of five auditory areas in the guinea pig cortex, we sought evidence that the larger fields can be divided into subareas based on unique patterns of cortical connections. Small extracellular injections of biocytin were made in combination with evoked potential mapping or single-unit analysis and histochemical determination of cortical landmarks. The two core fields, primary (AI) and dorsocaudal (DC), are partially surrounded by six adjacent belt areas, leaving two gaps: one at the rostral edge of AI and the other at the dorsal edge. All of the areas studied projected to their nearest neighbors, but AI was the only area to project to all seven of the other auditory areas. The caudal, high-frequency (more than 4 kHz) end of AI had different projections from the rostral, low-frequency (less than 1.5 kHz) end, and there was no evidence of connections between the two ends. Each end had separate dorsal and ventral projections. The two ends of AI may be working independently. By contrast, area DC had strong connections between its high- and low-frequency ends and it may be involved in auditory/visual integration. The dorsorostral belt (DRB) was subdivided into two zones on the basis of its projectio...Continue Reading

Citations

Sep 11, 2007·Experimental Brain Research·M N Wallace, A R Palmer
Feb 12, 2009·Experimental Brain Research·M N Wallace, A R Palmer
Mar 25, 2006·Journal of the Association for Research in Otolaryngology : JARO·Brett R SchofieldRyan M Schofield
Jun 1, 2005·Hearing Research·Mark N WallaceAlan R Palmer
Oct 4, 2002·Hearing Research·Mark N WallaceAlan R Palmer
May 15, 2003·Current Opinion in Neurobiology·Malcolm N Semple, Brian H Scott
Dec 20, 2012·PloS One·Jasmine M S GrimsleyMark N Wallace
Jul 7, 2009·Brain Research Bulletin·Brett R Schofield, Susan D Motts
Feb 6, 2007·Hearing Research·A R PalmerD R Moore
Dec 3, 2004·Hearing Research·Brett R Schofield, Diana L Coomes
Apr 8, 2015·The Journal of Comparative Neurology·Jennifer K BizleyAndrew J King
Oct 22, 2013·Hearing Research·Kyle T NakamotoBrett R Schofield
Dec 1, 2005·Neuroreport·Mark N WallaceAlan R Palmer
Oct 20, 2006·Journal of Neurophysiology·Masataka NishimuraWen-Jie Song
Sep 15, 2007·Journal of Neurophysiology·Kazuo Imaizumi, Christoph E Schreiner

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