![]() Also referred to as cochleotopy, it arises in the cochlea of the inner ear, which acts as a bank of parallel filters that are sharply tuned to neighboring frequencies ( von Bekesy 1949). Tonotopy is a key organizational feature of the vertebrate auditory system. We argue that our results corroborate and elucidate the apparently contradictory findings in literature.Īuditory cortex, cortical mapping, functional magnetic resonance imaging (fMRI), humans, tonotopy Introduction Our results show the bilateral existence of 3 tonotopic gradients in angulated orientations, which contrasts with colinear configurations that were suggested before. Another gradient was found on the planum temporale. Based on cortical parcellations, these 2 tonotopic progressions coincide with the primary auditory field (A1) in lateral koniocortex (Kl) and the rostral field (R) in medial koniocortex (Km), which together constitute a core region. Two high-frequency endpoints were situated on the caudal and rostral banks of medial Heschl's gyrus, while low-frequency activation peaked on its lateral crest. Data-driven analyses were employed to obtain robust tonotopic maps. In this functional magnetic resonance imaging study, 20 subjects were presented with low-level task-irrelevant tones to avoid spread of cortical activation. ![]() Despite numerous neuroimaging studies, the tonotopic organization in human auditory cortex is not yet unambiguously established. ![]()
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