A ventrorostral belt is adjacent to the guinea pig primary auditory cortex

Wallace, Mark N.; Rutkowski, Richard G.; Palmer, Alan R.

doi:10.1097/00001756-199907130-00019

Cited by 18 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…STRFs recorded in VRB also displayed response properties that were consistent with those previously reported for this area, i.e. long-latency, sustained excitation [Wallace et al, 1999] and overall, the area showed a significant difference in the distribution of STRF types compared to A1 and DC. Thus, VRB may be biased towards extracting different spectrotemporal features compared to A1 and DC, i.e.…”

Section: Comparison Of Strfs Between A1 and Other Fieldssupporting

confidence: 87%

“…In addition, the basic response properties of a unit such as the preference for noise or pure-tone bursts and the latency were also used to identify its location. As described in previous studies, units in field A1 and DC were characterised by relatively short-latency, onset type responses (mean latencies = 14.4 and 14.6 ms in A1 and DC, respectively), whilst units in the ventrorostral belt (VRB) showed longer-latency (24.0 ms), sustained responses [Wallace et al, 1999[Wallace et al, , 2000. In the dorsorostral Fig.…”

Section: Resultssupporting

confidence: 63%

“…The VRB unit shown in figure 6A was classed as type II, since it showed a single excitatory region that preceded an inhibitory region. Compared to STRFs recorded in A1 and DC, this unit appeared to show an excitatory region that was of longer latency and was more sustained, features that distinguish the majority of VRB neurones from those located in A1 [Wallace et al, 1999] and which are highlighted by the PSTH in figure 6B. This PSTH was obtained with 100-ms tone bursts presented monaurally to the contralateral ear at the CF, i.e.…”

Section: Strfs Recorded In Belt Areasmentioning

confidence: 89%

“…In the guinea pig, electrophysiological mapping studies have indicated that the auditory cortex consists of two major tonotopically organised 'core' areas, i.e. the primary (A1) and dorsocaudal (DC) fields, with adjacent non-or partially tonotopically organised belt areas [Hellweg et al, 1977;Redies et al, 1989a, b;Wallace et al, 1999Wallace et al, , 2000. The core areas, which characteristically show short-latency, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spectrotemporal Receptive Field Properties of Single Units in the Primary, Dorsocaudal and Ventrorostral Auditory Cortex of the Guinea Pig

et al. 2002

Self Cite

View full text Add to dashboard Cite

We report the spectrotemporal response properties of single units in the primary (A1) and dorsocaudal (DC) fields, and the ventrorostral belt of the urethane-anaesthetised guinea pig auditory cortex. Using reverse correlation analysis, spectrotemporal receptive fields (STRFs) were constructed and subsequently classified according to a novel qualitative scheme that was based on the duration and bandwidth of excitatory and inhibitory regions within the STRF. The STRFs of units in both A1 and DC showed either broad-band (≧1 octave) or narrow-band (<1 octave) excitatory and inhibitory regions occurring either alone or together. The excitatory regions were of short duration (lasting for <50 ms) or more sustained (up to about 100 ms) and inhibitory areas either followed excitation or were located as inhibitory sidebands along the high- and low-frequency edges of the excitatory regions. Inhibitory areas that followed excitatory regions were found to be either short lasting (10–20 ms) or longer lasting (up to 200 ms or more). The STRFs recorded from each cortical area indicated temporal response properties consistent with those shown by traditional peristimulus time histogram analysis. Overall, fields A1 and DC showed no significant differences in the distribution of STRF types. Thus, it appears that both fields display similar spectrotemporal sensitivities to auditory stimuli and therefore, appear to process such stimuli in a parallel fashion. Single units recorded in the ventrorostral belt area showed STRF types similar to those recorded in A1 and DC. However, the proportions of STRF types were significantly different, suggesting a difference in spectrotemporal processing between the ventrorostral belt and the core areas.

show abstract

Section: Comparison Of Strfs Between A1 and Other Fieldssupporting

confidence: 87%

Section: Resultssupporting

confidence: 63%

Section: Strfs Recorded In Belt Areasmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectrotemporal Receptive Field Properties of Single Units in the Primary, Dorsocaudal and Ventrorostral Auditory Cortex of the Guinea Pig

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…We are currently investigating the mechanisms of such corticofugal modulation. Following earlier work at lower levels of the system, in acute experiments we are characterising the different regions of the guinea pig auditory cortex (Rutkowski et al, 2002;Rutkowski et al, 2000;Wallace et al, 1999Wallace et al, , 2000aWallace et al, , 2002aWallace et al, , 2005aWallace et al, 2000b;Wallace et al, 2005b;Wallace et al, 2002b). However, we have recently begun to bridge the gap between our earlier work in lower levels of the auditory pathway (up to and including the inferior colliculus) and the cortical work with a series of studies of the auditory thalamus.…”

Section: Corticofugal Modulation Of Auditory Processingmentioning

confidence: 99%

Some investigations into non-passive listening

et al. 2007

View full text Add to dashboard Cite

Our knowledge of the function of the auditory nervous system is based upon a wealth of data obtained, for the most part, in anaesthetised animals. More recently, it has been generally acknowledged that factors such as attention profoundly modulate the activity of sensory systems and this can take place at many levels of processing. Imaging studies, in particular, have revealed the greater activation of auditory areas and areas outside of sensory processing areas when attending to a stimulus. We present here a brief review of the consequences of such non-passive listening and go on to describe some of the experiments we are conducting to investigate them. In imaging studies, using fMRI, we can demonstrate the activation of attention networks that are non-specific to the sensory modality as well as greater and different activation of the areas of the supra-temporal plane that includes primary and secondary auditory areas. The profuse descending connections of the auditory system seem likely to be part of the mechanisms subserving attention to sound. These are generally thought to be largely inactivated by anaesthesia. However, we have been able to demonstrate that even in an anaesthetised preparation, removing the descending control from the cortex leads to quite profound changes in the temporal patterns of activation by sounds in thalamus and inferior colliculus. Some of these effects seem to be specific to the ear of stimulation and affect interaural processing. To bridge these observations we are developing an awake behaving preparation involving freely moving animals in which it will be possible to investigate the effects of consciousness (by contrasting awake and anaesthetized), passive and active listening.

show abstract

Interconnections of auditory areas in the guinea pig neocortex

2002

View full text Add to dashboard Cite

By studying the efferent projections of five auditory areas in the guinea pig cortex, we sought evidence that the larger fields can be divided into subareas based on unique patterns of cortical connections. Small extracellular injections of biocytin were made in combination with evoked potential mapping or single-unit analysis and histochemical determination of cortical landmarks. The two core fields, primary (AI) and dorsocaudal (DC), are partially surrounded by six adjacent belt areas, leaving two gaps: one at the rostral edge of AI and the other at the dorsal edge. All of the areas studied projected to their nearest neighbors, but AI was the only area to project to all seven of the other auditory areas. The caudal, high-frequency (more than 4 kHz) end of AI had different projections from the rostral, low-frequency (less than 1.5 kHz) end, and there was no evidence of connections between the two ends. Each end had separate dorsal and ventral projections. The two ends of AI may be working independently. By contrast, area DC had strong connections between its high- and low-frequency ends and it may be involved in auditory/visual integration. The dorsorostral belt (DRB) was subdivided into two zones on the basis of its projections: the more rostral part appears to overlap the second somatosensory area and be bimodal, while the caudal part has stronger auditory connections. The small belt area (area S) had separate physiological and anatomical properties from the rest of the rostral belt.

show abstract

A ventrorostral belt is adjacent to the guinea pig primary auditory cortex

Cited by 18 publications

References 15 publications

Spectrotemporal Receptive Field Properties of Single Units in the Primary, Dorsocaudal and Ventrorostral Auditory Cortex of the Guinea Pig

Spectrotemporal Receptive Field Properties of Single Units in the Primary, Dorsocaudal and Ventrorostral Auditory Cortex of the Guinea Pig

Some investigations into non-passive listening

Interconnections of auditory areas in the guinea pig neocortex

Contact Info

Product

Resources

About