scholarly journals Thalamic Connections of Auditory Cortex in Marmoset Monkeys: Lateral Belt and Parabelt Regions

2012 ◽  
Vol 295 (5) ◽  
pp. 822-836 ◽  
Author(s):  
Lisa A. de la Mothe ◽  
Suzanne Blumell ◽  
Yoshinao Kajikawa ◽  
Troy A. Hackett
Keyword(s):  
Auditory Cortex ◽  
Marmoset Monkeys

scholarly journals Cortical Connections of Auditory Cortex in Marmoset Monkeys: Lateral Belt and Parabelt Regions

2012 ◽  
Vol 295 (5) ◽  
pp. 800-821 ◽  
Author(s):  
Lisa A. de la Mothe ◽  
Suzanne Blumell ◽  
Yoshinao Kajikawa ◽  
Troy A. Hackett
Keyword(s):  
Auditory Cortex ◽  
Cortical Connections ◽  
Marmoset Monkeys

Differential Representation of Species-Specific Primate Vocalizations in the Auditory Cortices of Marmoset and Cat

2001 ◽  
Vol 86 (5) ◽  
pp. 2616-2620 ◽  
Author(s):  
Xiaoqin Wang ◽  
Siddhartha C. Kadia
Keyword(s):  
Auditory Cortex ◽  
Primary Auditory Cortex ◽  
Cortical Processing ◽  
Neural Responses ◽  
The Difference ◽  
Auditory Cortices ◽  
Species Specific ◽  
Primate Vocalizations ◽  
Marmoset Monkeys

A number of studies in various species have demonstrated that natural vocalizations generally produce stronger neural responses than do their time-reversed versions. The majority of neurons in the primary auditory cortex (A1) of marmoset monkeys responds more strongly to natural marmoset vocalizations than to the time-reversed vocalizations. However, it was unclear whether such differences in neural responses were simply due to the difference between the acoustic structures of natural and time-reversed vocalizations or whether they also resulted from the difference in behavioral relevance of both types of the stimuli. To address this issue, we have compared neural responses to natural and time-reversed marmoset twitter calls in A1 of cats with those obtained from A1 of marmosets using identical stimuli. It was found that the preference for natural marmoset twitter calls demonstrated in marmoset A1 was absent in cat A1. While both cortices responded approximately equally to time-reversed twitter calls, marmoset A1 responded much more strongly to natural twitter calls than did cat A1. This differential representation of marmoset vocalizations in two cortices suggests that experience-dependent and possibly species-specific mechanisms are involved in cortical processing of communication sounds.

Cortical connections of the auditory cortex in marmoset monkeys: Core and medial belt regions

2006 ◽  
Vol 496 (1) ◽  
pp. 27-71 ◽  
Author(s):  
Lisa A. de la Mothe ◽  
Suzanne Blumell ◽  
Yoshinao Kajikawa ◽  
Troy A. Hackett
Keyword(s):  
Auditory Cortex ◽  
Cortical Connections ◽  
Marmoset Monkeys

scholarly journals Thalamic connections of the auditory cortex in marmoset monkeys: Core and medial belt regions

2006 ◽  
Vol 496 (1) ◽  
pp. 72-96 ◽  
Author(s):  
Lisa A. De La Mothe ◽  
Suzanne Blumell ◽  
Yoshinao Kajikawa ◽  
Troy A. Hackett
Keyword(s):  
Auditory Cortex ◽  
Marmoset Monkeys

Neural Representations of Temporally Modulated Signals in the Auditory Thalamus of Awake Primates

2007 ◽  
Vol 97 (2) ◽  
pp. 1005-1017 ◽  
Author(s):  
Edward L. Bartlett ◽  
Xiaoqin Wang
Keyword(s):  
Auditory Cortex ◽  
Temporal Processing ◽  
Medial Geniculate Body ◽  
Relay Station ◽  
Thalamic Neurons ◽  
Neural Representations ◽  
Processing Abilities ◽  
Medial Geniculate ◽  
Discharge Patterns ◽  
Marmoset Monkeys

In sensory systems, the thalamus has historically been considered a relay station. Neural representations of temporal modulations in the auditory system undergo considerable changes as they pass from the inferior colliculus (IC) to the auditory cortex. We sought to determine in awake primates the extent to which auditory thalamic neurons contribute to these transformations. We tested the temporal processing capabilities of medial geniculate body (MGB) neurons in awake marmoset monkeys using repetitive click stimuli. MGB neurons were able to synchronize to periodic clicks at repetition rates significantly higher than auditory cortex neurons. Unlike responses in the MGB of anesthetized animals, >40% of MGB neurons in awake marmosets displayed nonsynchronized discharges when stimulated by high click rates (short interclick intervals). Such nonsynchronized MGB responses typically occurred at higher repetition rates than those observed in auditory cortex. In contrast to auditory cortex neurons, many MGB neurons exhibited both synchronized and nonsynchronized discharge patterns. In both MGB and auditory cortex, synchronized and nonsynchronized responses represented complementary ranges of interclick intervals (1/click rate). Furthermore, the temporal processing abilities of some MGB neurons were sensitive to the spectrotemporal parameters of the click stimuli used. Together, these findings suggest that MGB neurons participate in active transformations of the neural representations of temporal modulations from IC to auditory cortex. In particular, the MGB appears to be the first station in the auditory ascending pathway in which substantial nonsynchronized responses emerge.

scholarly journals Neural Response Properties of Primary, Rostral, and Rostrotemporal Core Fields in the Auditory Cortex of Marmoset Monkeys

2008 ◽  
Vol 100 (2) ◽  
pp. 888-906 ◽  
Author(s):  
Daniel Bendor ◽  
Xiaoqin Wang
Keyword(s):  
Auditory Cortex ◽  
Auditory Processing ◽  
Transfer Functions ◽  
Primary Auditory Cortex ◽  
Modulation Transfer ◽  
Response Properties ◽  
Sound Levels ◽  
Pure Tones ◽  
Functional Pathway ◽  
Marmoset Monkeys

The core region of primate auditory cortex contains a primary and two primary-like fields (AI, primary auditory cortex; R, rostral field; RT, rostrotemporal field). Although it is reasonable to assume that multiple core fields provide an advantage for auditory processing over a single primary field, the differential roles these fields play and whether they form a functional pathway collectively such as for the processing of spectral or temporal information are unknown. In this report we compare the response properties of neurons in the three core fields to pure tones and sinusoidally amplitude modulated tones in awake marmoset monkeys ( Callithrix jacchus). The main observations are as follows. ( 1) All three fields are responsive to spectrally narrowband sounds and are tonotopically organized. ( 2) Field AI responds more strongly to pure tones than fields R and RT. ( 3) Field RT neurons have lower best sound levels than those of neurons in fields AI and R. In addition, rate-level functions in field RT are more commonly nonmonotonic than in fields AI and R. ( 4) Neurons in fields RT and R have longer minimum latencies than those of field AI neurons. ( 5) Fields RT and R have poorer stimulus synchronization than that of field AI to amplitude-modulated tones. ( 6) Between the three core fields the more rostral regions (R and RT) have narrower firing-rate–based modulation transfer functions than that of AI. This effect was seen only for the nonsynchronized neurons. Synchronized neurons showed no such trend.

Influence of kainic acid and long-lasting intermitent hypoxia on auditory cortex

2005 ◽  
Vol 84 (01) ◽  
Author(s):  
P Benesová ◽  
M Langmeier ◽  
J Betka ◽  
S Trojan
Keyword(s):  
Auditory Cortex ◽  
Kainic Acid
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