Tonotopic organization, architectonic fields, and connections of auditory cortex in macaque monkeys

  title={Tonotopic organization, architectonic fields, and connections of auditory cortex in macaque monkeys},
  author={Anne Morel and Preston E. Garraghty and Jon H. Kaas},
  journal={Journal of Comparative Neurology},
Microelectrode recordings were used to investigate the tonotopic organization of auditory cortex of macaque monkeys and guide the placement of injections of wheat germ agglutininhorse radish peroxidase (WGA‐HRP) and fluorescent dyes. Anatomical and physiological results were later related to histological distinctions in the same brains after sections were processed for cytoarchitecture, myeloarchitecture, acetylcholinesterase (AchE), or cytochrome oxidase (CO). The experiments produced serveral… 
Functional organization of squirrel monkey primary auditory cortex: responses to pure tones.
The spatial organization of response parameters in squirrel monkey primary auditory cortex (AI) accessible on the temporal gyrus was determined with the excitatory receptive field to pure tone stimuli to support the existence of multiple, overlying receptive field gradients within AI.
Modular functional organization of cat anterior auditory field.
A comparison of RFPs between AAF and AI shows that AAF neurons were more broadly tuned and had shorter latencies than AI neurons, which strongly suggest field-specific processing.
Thalamocortical connections of the parabelt auditory cortex in macaque monkeys
The thalamocortical connections of the parabelt auditory cortex are described based on multiple injections of neuronal tracers into this region in each of five macaque monkeys, suggesting that this region represents a third level of auditory cortical processing, which is not influenced by direct inputs from primary cortical or subcortical auditory structures.
Redefining the tonotopic core of rat auditory cortex: Physiological evidence for a posterior field
The physiological data suggest that core auditory cortex (temporal area TE1) is composed not only of AI as previously thought, but also of at least two other subdivisions, P and an anterior field (A), and that it is larger than suggested by previous anatomical characterizations.
Subdivisions of AuditoryCortex and Levels of Processing in Primates
The results indicate that auditory processing involves 15 or more cortical areas, each of which is interconnected with a number of other fields, especially adjoining fields of the same level.
Functional organization and hemispheric comparison of primary auditory cortex in the common marmoset (Callithrix jacchus)
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, and globally, this functional organization in the common marmoset is similar to that in other mammalian species.
Callosal connections of the ferret primary auditory cortex
The discrete nature of the callosal bands in the ferret appears to make it a suitable species for studying the relationship between callosal terminals and those arising in other areas of the brain and for clarifying the possible existence of separate functional systems within the auditory cortex.
Subdivisions of auditory cortex and ipsilateral cortical connections of the parabelt auditory cortex in macaque monkeys
Observations support the concept of dividing the auditory cortex into core, belt, and parabelt; provide evidence for including the rostral area in the core; suggest the existence of as many as seven or eight belt fields; provideevidence for at least two subdivisions of the parab belt; and identify regions of the temporal lobe involved in auditory processing.
Cytoarchitecture of the medial geniculate body and thalamic projections to the auditory cortex in the rufous horseshoe bat (Rhinolophus rouxi)
The organization of the medial geniculate body projections to the temporal auditory cortex is quite similar to that described in other mammals, including cat and monkey.
Functional organization of spectral receptive fields in the primary auditory cortex of the owl monkey
The spatial distribution of pure‐tone receptive field parameters across the primary auditory cortex (AI) in six owl monkeys was studied and the overall organizational pattern of overlaying but independent functional maps that emerged was quite similar to that seen in AI of cats.


Subdivisions and connections of auditory cortex in owl monkeys
The organization and connections of auditory cortex in owl monkeys, Aotus trivirgatus, were investigated by combining microelectrode mapping methods with studies of architecture and connections in
Connections of primary auditory cortex in the new world monkey, Saguinus
Connections of primary auditory cortex (A‐I) were investigated in the tamarin, a New World monkey, and the pattern of connections between A‐I and adjoining cortex suggests that this surrounding auditory cortex contains at least two tonotopically organized fields and possibly one or more additional auditory fields.
Organization of auditory cortex in the owl monkey (Aotus trivirgatus)
Electrophysiological and cytoarchitectonic evidence suggest that this belt of cortex in the owl monkey is composed of at least three and possibly four separate auditory fields, which are generally less responsive to acoustic stimulation and the frequency organization is more complex than in AI or R.
Tonotopic organization in ventral nucleus of medial geniculate body in the cat.
A model of the three-dimensional tonotopic organization of the ventral nucleus is described that is consistent with the two-dimensional best-frequency maps obtained at different rostrocaudal levels and with locations of ventrals nucleus neurons labeled by horseradish peroxidase injections into low-, mid-, and high-frequency representations in auditory cortex.
Projections of auditory cortex upon the thalamus and Midbrain in the owl monkey
Two tonotopically organized cortical fields, the primary (AI) and the rostral (R) fields, comprise the core of auditory cortex in the owl monkey and were made into each of these fields to determine their efferent projections using autoradiographic methods.
Patterns of metabolic activity in cytoarchitectural area SII and surrounding cortical fields of the monkey.
The pattern of [14C]2-deoxyglucose (2-DG) labeling evoked by tactile stimuli was determined in cerebral cortical cytoarchitectural area SII and the fields that surround it and it is hypothesized that these metabolic modules may correspond to information-processing units within the cerebral cortex.
Auditory cortico‐cortical connections in the owl monkey
Two tonotopically organized cortical fields, the primary (A1) and rostral (R) fields, comprise a core of auditory cortex in the owl monkey. Injections of tritiated proline were made into each of
The thalamocortical and corticothalamic conections of AI, AII, and the anteriior auditory field (AFF) in the cat: Evidence ofr two largely sergregarted systems of connections
The thalamocortical and corticothalamic connections of the three cortical auditory fields—first (AI), second (AII), and anterior (AAF)—were defined using anterograde and retrograde tracing techniques to determine the systematic topographies of the connections between these cortical fields and the medial geniculate body subdivisions.