» Articles » PMID: 24795550

Feedforward and Feedback Projections of Caudal Belt and Parabelt Areas of Auditory Cortex: Refining the Hierarchical Model

Overview
Journal Front Neurosci
Date 2014 May 6
PMID 24795550
Citations 37
Authors
Affiliations
Soon will be listed here.
Abstract

Our working model of the primate auditory cortex recognizes three major regions (core, belt, parabelt), subdivided into thirteen areas. The connections between areas are topographically ordered in a manner consistent with information flow along two major anatomical axes: core-belt-parabelt and caudal-rostral. Remarkably, most of the connections supporting this model were revealed using retrograde tracing techniques. Little is known about laminar circuitry, as anterograde tracing of axon terminations has rarely been used. The purpose of the present study was to examine the laminar projections of three areas of auditory cortex, pursuant to analysis of all areas. The selected areas were: middle lateral belt (ML); caudomedial belt (CM); and caudal parabelt (CPB). Injections of anterograde tracers yielded data consistent with major features of our model, and also new findings that compel modifications. Results supporting the model were: (1) feedforward projection from ML and CM terminated in CPB; (2) feedforward projections from ML and CPB terminated in rostral areas of the belt and parabelt; and (3) feedback projections typified inputs to the core region from belt and parabelt. At odds with the model was the convergence of feedforward inputs into rostral medial belt from ML and CPB. This was unexpected since CPB is at a higher stage of the processing hierarchy, with mainly feedback projections to all other belt areas. Lastly, extending the model, feedforward projections from CM, ML, and CPB overlapped in the temporal parietal occipital area (TPO) in the superior temporal sulcus, indicating significant auditory influence on sensory processing in this region. The combined results refine our working model and highlight the need to complete studies of the laminar inputs to all areas of auditory cortex. Their documentation is essential for developing informed hypotheses about the neurophysiological influences of inputs to each layer and area.

Citing Articles

A hierarchy index for networks in the brain reveals a complex entangled organizational structure.

Pathak A, Menon S, Sinha S Proc Natl Acad Sci U S A. 2024; 121(27):e2314291121.

PMID: 38923990 PMC: 11228506. DOI: 10.1073/pnas.2314291121.


The neurobiology of vocal communication in marmosets.

Grijseels D, Prendergast B, Gorman J, Miller C Ann N Y Acad Sci. 2023; 1528(1):13-28.

PMID: 37615212 PMC: 10592205. DOI: 10.1111/nyas.15057.


Neuroplasticity and Crossmodal Connectivity in the Normal, Healthy Brain.

Karim A, Proulx M, de Sousa A, Likova L Psychol Neurosci. 2023; 14(3):298-334.

PMID: 36937077 PMC: 10019101. DOI: 10.1037/pne0000258.


Transformation of acoustic information to sensory decision variables in the parietal cortex.

Yao J, Zemlianova K, Hocker D, Savin C, Constantinople C, Chung S Proc Natl Acad Sci U S A. 2023; 120(2):e2212120120.

PMID: 36598952 PMC: 9926273. DOI: 10.1073/pnas.2212120120.


Auditory cortex modelled as a dynamical network of oscillators: understanding event-related fields and their adaptation.

Hajizadeh A, Matysiak A, Wolfrum M, May P, Konig R Biol Cybern. 2022; 116(4):475-499.

PMID: 35718809 PMC: 9287241. DOI: 10.1007/s00422-022-00936-7.


References
1.
Boussaoud D, Ungerleider L, DeSimone R . Pathways for motion analysis: cortical connections of the medial superior temporal and fundus of the superior temporal visual areas in the macaque. J Comp Neurol. 1990; 296(3):462-95. DOI: 10.1002/cne.902960311. View

2.
Scott B, Malone B, Semple M . Transformation of temporal processing across auditory cortex of awake macaques. J Neurophysiol. 2010; 105(2):712-30. PMC: 3059172. DOI: 10.1152/jn.01120.2009. View

3.
de la Mothe L, Blumell S, Kajikawa Y, Hackett T . Cortical connections of the auditory cortex in marmoset monkeys: core and medial belt regions. J Comp Neurol. 2006; 496(1):27-71. DOI: 10.1002/cne.20923. View

4.
Hackett T, Stepniewska I, Kaas J . Prefrontal connections of the parabelt auditory cortex in macaque monkeys. Brain Res. 1999; 817(1-2):45-58. DOI: 10.1016/s0006-8993(98)01182-2. View

5.
de la Mothe L, Blumell S, Kajikawa Y, Hackett T . Cortical connections of auditory cortex in marmoset monkeys: lateral belt and parabelt regions. Anat Rec (Hoboken). 2012; 295(5):800-21. PMC: 3379817. DOI: 10.1002/ar.22451. View