Tonotopic Representation and Space Map in the Non-Primary Auditory Cortex of the Mustached Bat

Kujirai, Kazuro; Suga, Nobuo

doi:10.1016/s0385-8146(83)80024-8

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…Spatial analyses for receptive field features beyond CF have been examined in AI for several species (for review see Read et al 2002;Schreiner 1998;Suga 1984) and, to a lesser extent, in auditory fields outside of AI Kujirai and Suga 1983). The present study is the first attempt to demonstrate a spatial organization of response characteristics beyond CF in the ventral auditory core in any species.…”

Section: Comparative Analysis Of Rat Auditory Cortex Functional Organmentioning

confidence: 92%

Multiparametric Auditory Receptive Field Organization Across Five Cortical Fields in the Albino Rat

Polley

Read²,

Storace³

et al. 2007

Journal of Neurophysiology

302

326

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Section: Comparative Analysis Of Rat Auditory Cortex Functional Organmentioning

confidence: 92%

Multiparametric Auditory Receptive Field Organization Across Five Cortical Fields in the Albino Rat

Polley

Read²,

Storace³

et al. 2007

Journal of Neurophysiology

302

326

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“…Thus, the cortex is dominated by the somatosensory system, and cortical fields within the somatosensory domain are dominated by representations of the bill. Other examples of cortical magnification can be observed in a variety of species, including the expansion of auditory cortex associated with alterations in the cochlea in echolocating bats (e.g., Suga et al, 1975;Asanuma et al, 1983;Kujirai and Suga, 1983), and the magnification of the hand representation in S1 associated with changes in the structure of the hand and receptor distribution and density in the hand of primates and raccoons (e.g., Nelson et al, 1980;Welker and Seidenstein, 1959). In humans alterations in the larynx, tongue, lips, and other In the platypus, the bill representation occupies the majority of S1, while in the raccoon, the hand representation in S1 is extremely large, larger than the magnification of the hand in humans.…”

Section: How Are Brains Similar?mentioning

confidence: 99%

The Magnificent Compromise: Cortical Field Evolution in Mammals

Krubitzer

2007

Neuron

232

176

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The neocortex of mammals is composed of cortical fields that have a unique organization associated with the animal's ecological niche and lifestyle. Each cortical field has a specific pattern of connections with other cortical fields and brain structures, and together they comprise a neocortical network that generates a variety of behaviors. These networks and the behaviors they generate are variable across mammals, and are particularly complex in some species such as humans. Here I discuss the mechanisms that contribute to neocortical organization in mammals, and how this organization has been altered to generate the variability that exists in different lineages.

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“…No clear topographic representations of space or binaural disparities have been reported within or across these clusters (e.g., Brugge et al 1994;Clarey et al 1994;Imig et al 1990;Middlebrooks and Pettigrew 1981;Rajan et al 1990). There are reports that small regions of cortical fields outside of primary auditory cortex do show systematic shifts in azimuthal tuning (e.g., Kujirai and Suga 1983;Middlebrooks et al 1998), suggesting the presence of local topographies that may serve spatial processing. However, the caveat commonly applied to such representations is that they are apparent only near threshold and that spatial tuning deteriorates as sound intensity increases.…”

Section: Introductionmentioning

confidence: 99%

Functional Organization of the Pallid Bat Auditory Cortex: Emphasis on Binaural Organization

Razak

Fuzessery

2002

Journal of Neurophysiology

117

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This report maps the organization of the primary auditory cortex of the pallid bat in terms of frequency tuning, selectivity for behaviorally relevant sounds, and interaural intensity difference (IID) sensitivity. The pallid bat is unusual in that it localizes terrestrial prey by passively listening to prey-generated noise transients (1-20 kHz), while reserving high-frequency (<30 kHz) echolocation for obstacle avoidance. The functional organization of its auditory cortex reflects the need for specializations in echolocation and passive sound localization. Best frequencies were arranged tonotopically with a general increase in the caudolateral to rostromedial direction. Frequencies between 24 and 32 kHz were under-represented, resulting in hypertrophy of frequencies relevant for prey localization and echolocation. Most neurons (83%) tuned <30 kHz responded preferentially to broadband or band-pass noise over single tones. Most neurons (62%) tuned >30 kHz responded selectively or exclusively to the 60- to 30-kHz downward frequency-modulated (FM) sweep used for echolocation. Within the low-frequency region, neurons were placed in two groups that occurred in two separate clusters: those selective for low- or high-frequency band-pass noise and suppressed by broadband noise, and neurons that showed no preference for band-pass noise over broadband noise. Neurons were organized in homogeneous clusters with respect to their binaural response properties. The distribution of binaural properties differed in the noise- and FM sweep-preferring regions, suggesting task-dependent differences in binaural processing. The low-frequency region was dominated by a large cluster of binaurally inhibited neurons with a smaller cluster of neurons with mixed binaural interactions. The FM sweep-selective region was dominated by neurons with mixed binaural interactions or monaural neurons. Finally, this report describes a cortical substrate for systematic representation of a spatial cue, IIDs, in the low-frequency region. This substrate may underlie a population code for sound localization based on a systematic shift in the distribution of activity across the cortex with sound source location.

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Tonotopic Representation and Space Map in the Non-Primary Auditory Cortex of the Mustached Bat

Cited by 14 publications

References 14 publications

Multiparametric Auditory Receptive Field Organization Across Five Cortical Fields in the Albino Rat

Multiparametric Auditory Receptive Field Organization Across Five Cortical Fields in the Albino Rat

The Magnificent Compromise: Cortical Field Evolution in Mammals

Functional Organization of the Pallid Bat Auditory Cortex: Emphasis on Binaural Organization

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