2026-09-18T17:38:46Zhttps://publikationen.uni-tuebingen.de/oai/requestoai:publikationen.uni-tuebingen.de:10900/707122019-10-30T05:54:34Zcom_10900_42126col_10900_42133
Publikationssystem UB Tuebingen
advisor
Logothetis, Nikos K. (Prof. Dr.)
author
Ortiz Rios, Michael
2016-06-21T09:55:09Z
2016-06
470876026
http://hdl.handle.net/10900/70712
One fundamental goal of the brain is to predict sensory events in the environment in
order to spatially direct actions. In vision, the ability to identify and locate objects
depends on two cortical pathways: a ventral “what” stream supporting object
recognition and a dorsal “where” stream supporting object localization. While this
hierarchical model received strong support in vision, in audition the analogues
functional roles have remained rather elusive, particularly for the dorsal “where”
stream. Thus, the objective of this thesis was to explore the functional roles of auditory
ventral and dorsal stream pathways in the macaque brain. We first explored the
representational structure of natural sounds in early regions of the ventral pathway
utilizing single-unit electrophysiology. We then used functional magnetic resonance
imaging (fMRI) to map the representation of natural sounds along the ventral pathway
including regions outside auditory cortex. Finally, using high-field fMRI we examined
the functional representation of acoustic space in auditory cortical regions. Overall, our
work confirms the role of the ventral stream in decoding sound identity and extends the
evidence suggesting that vocalizations carry information that is represented outside
auditory cortex. Moreover, our work in the dorsal stream also confirms the role of a
posterior dorsal cortical region specialized in processing spatial information and
reconciles competitive theories of spatial coding in auditory cortex. However, our space
work also indicates a fundamental difference in the representation format for acoustic
space in auditory cortex as compared to visual cortex. Taken together, our work
confirms the functional roles of the ventral and dorsal streams and suggests
incorporating subcortical level processes in the cortical model for a more integrated
framework of acoustic processing in the primate brain.
en
ubt-podok
FUNCTIONAL NEUROIMAGING OF VENTRAL AND DORSAL STREAM PATHWAYS IN THE MACAQUE AUDITORY SYSTEM
PhDThesis
URL
https://publikationen.uni-tuebingen.de/xmlui/bitstream/10900/70712/3/Ortiz-Rios%20Thesis-Original.pdf
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Ortiz-Rios Thesis-Original.pdf
URL
https://publikationen.uni-tuebingen.de/xmlui/bitstream/10900/70712/5/Ortiz-Rios%20Thesis-Original.pdf.txt
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Ortiz-Rios Thesis-Original.pdf.txt