From perception to action in songbird production: Dynamics of a whole loop

Amador, Ana; Boari, Santiago; Mindlin, Gabriel B.

doi:10.1016/j.coisb.2017.03.004

Cited by 8 publications

(8 citation statements)

References 47 publications

(47 reference statements)

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“…Likewise, lesions of the trigemino‐recipient arcopallial region in pigeons produce pecking deficits similar to those seen after damage to central trigeminal structures (Levine & Zeigler, ). Perhaps the clearest motor function of the arcopallium is seen in songbirds, where neurons from the nucleus robustus of the arcopallium (RA), the specialized nuclear AI core related to the auditory zone characteristic of this group, drive the brainstem motor nuclei controlling song performance (Amador, Boari, & Mindlin, ; Doupe, Solis, Kimpo, & Boettiger, ; Mooney, ; Nottebohm, ). Different populations of RA neurons fire specific sequences of spike bursts that are thoroughly repeated during successive renditions of the song (Yu & Margoliash, ).…”

Section: Discussionmentioning

confidence: 99%

“…These are translated, via direct RA connections upon motoneurons of the hypoglossal and respiratory nuclei, into the appropriate combinations of syringeal muscle activation and respiratory patterning producing the song (Leonardo & Fee, 2005;Vicario, 1991). The RA neurons also project to the dorsomedial nucleus of the ICo (DM), another premotor structure presumably involved in song production (Amador et al, 2017;Horita et al, 2012;Jarvis, Scharff, Grossman, Ramos, & Nottebohm, 1998;Wild, Li, & Eagleton, 1997). Interestingly, these motor connections of the auditory arcopallium are exclusive to the RA, whereas the AI shell area that surrounds RA projects to the ICo (surrounding the DM) and to the reticular region surrounding the hypoglossal and respiratory nuclei, just as the auditory arcopallium in pigeons (Mello et al, 1998).…”

Section: Functional Considerationsmentioning

confidence: 99%

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Parallel organization of the avian sensorimotor arcopallium: Tectofugal visual pathway in the pigeon (Columba livia)

Fernández

Morales

Durán

et al. 2019

J of Comparative Neurology

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The sensory–motor division of the avian arcopallium receives parallel inputs from primary and high‐order pallial areas of sensory and vocal control pathways, and sends a prominent descending projection to ascending and premotor, subpallial stages of these pathways. While this organization is well established for the auditory and trigeminal systems, the arcopallial subdivision related to the tectofugal visual system and its descending projection to the optic tectum (TeO) has been less investigated. In this study, we charted the arcopallial area displaying tectofugal visual responses and by injecting neural tracers, we traced its connectional anatomy. We found visual motion‐sensitive responses in a central region of the dorsal (AD) and intermediate (AI) arcopallium, in between previously described auditory and trigeminal zones. Blocking the ascending tectofugal sensory output, canceled these visual responses in the arcopallium, verifying their tectofugal origin. Injecting PHA‐L into the visual, but not into the auditory AI, revealed a massive projection to tectal layer 13 and other tectal related areas, sparing auditory, and trigeminal ones. Conversely, CTB injections restricted to TeO retrogradely labeled neurons confined to the visual AI. These results show that the AI zone receiving tectofugal inputs sends top‐down modulations specifically directed to tectal targets, just like the auditory and trigeminal AI zones project back to their respective subpallial sensory and premotor areas, as found by previous studies. Therefore, the arcopallium seems to be organized in a parallel fashion, such that in spite of expected cross‐modal integration, the different sensory–motor loops run through separate subdivisions of this structure.

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Section: Discussionmentioning

confidence: 99%

Section: Functional Considerationsmentioning

confidence: 99%

Parallel organization of the avian sensorimotor arcopallium: Tectofugal visual pathway in the pigeon (Columba livia)

Fernández

Morales

Durán

et al. 2019

J of Comparative Neurology

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“…Continuous temporal encoding of vocal features was proposed as a key role of HVC [ 16 , 20 ]. However, this view has been open to debate recently with the proposition that activity in this nucleus only encodes relevant instances of song [ 17 , 21 – 23 ], and by a complementary proposition [ 24 , 25 ] in which song timescales appear from the interaction of the HVC with the rest of the motor pathway. These have broadened the discussion regarding the possible motor coding of song in HVC, leading to the proposition of recurrent networks for song timing generation [ 23 , 26 – 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, this view has been open to debate recently with the proposition that activity in this nucleus only encodes relevant instances of song [ 17 , 21 – 23 ], and by a complementary proposition [ 24 , 25 ] in which song timescales appear from the interaction of the HVC with the rest of the motor pathway. These have broadened the discussion regarding the possible motor coding of song in HVC, leading to the proposition of recurrent networks for song timing generation [ 23 , 26 – 29 ]. In addition, recently, it has been shown that HVC projecting neurons fire densely during singing behavior [ 30 – 32 ], and that another nucleus in the song pathway, the subthalamic nucleus Uva, has a significant contribution to song timing [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature manipulation of neuronal dynamics in a forebrain motor control nucleus

Goldin

Mindlin

2017

PLoS Comput Biol

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Different neuronal types within brain motor areas contribute to the generation of complex motor behaviors. A widely studied songbird forebrain nucleus (HVC) has been recognized as fundamental in shaping the precise timing characteristics of birdsong. This is based, among other evidence, on the stretching and the “breaking” of song structure when HVC is cooled. However, little is known about the temperature effects that take place in its neurons. To address this, we investigated the dynamics of HVC both experimentally and computationally. We developed a technique where simultaneous electrophysiological recordings were performed during temperature manipulation of HVC. We recorded spontaneous activity and found three effects: widening of the spike shape, decrease of the firing rate and change in the interspike interval distribution. All these effects could be explained with a detailed conductance based model of all the neurons present in HVC. Temperature dependence of the ionic channel time constants explained the first effect, while the second was based in the changes of the maximal conductance using single synaptic excitatory inputs. The last phenomenon, only emerged after introducing a more realistic synaptic input to the inhibitory interneurons. Two timescales were present in the interspike distributions. The behavior of one timescale was reproduced with different input balances received form the excitatory neurons, whereas the other, which disappears with cooling, could not be found assuming poissonian synaptic inputs. Furthermore, the computational model shows that the bursting of the excitatory neurons arises naturally at normal brain temperature and that they have an intrinsic delay at low temperatures. The same effect occurs at single synapses, which may explain song stretching. These findings shed light on the temperature dependence of neuronal dynamics and present a comprehensive framework to study neuronal connectivity. This study, which is based on intrinsic neuronal characteristics, may help to understand emergent behavioral changes.

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“…In an alternative hypothesis, the activation of the neuronal nuclei responsible for respiration may not only be due to the activity in the telencephalic area flowing downstream but also to the activation in other regions within the brainstem [15][16][17][18]. This does not mean that the timing signals in HVC do not play a crucial role, but that the system has to be analyzed in an integral fashion.…”

Section: Introductionmentioning

confidence: 99%

Modeling temperature manipulations in a circular model of birdsong production

2018

Self Cite

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The nature of the neural mechanisms in the birdsong motor pathway that lead to the generation of respiratory patterns are a matter of extensive debate. In a top-down control paradigm, vocal gestures emerge from a unique timescale ruled by the telencephalic nucleus HVC, which engages other brain regions downstream. Another possibility is that the generation of motor instructions is distributed throughout the neural network, flowing both upstream and downstream. In this circular architecture, the song results from the integration of more than one timescale. In order to disambiguate these views, we used local focal cooling of HVC in canaries to manipulate the timescale present there. Within the frame of the circular model, we fitted the experimental pressure patterns of different types of syllables, which form a full song. We show that at least two separate timescales must be taken into account to reproduce them, one which is manipulated by cooling while the other remains unchanged. The modifications -stretching and breaking-of the syllables were quantitatively reproduced in this frame.

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From perception to action in songbird production: Dynamics of a whole loop

Cited by 8 publications

References 47 publications

Parallel organization of the avian sensorimotor arcopallium: Tectofugal visual pathway in the pigeon (Columba livia)

Parallel organization of the avian sensorimotor arcopallium: Tectofugal visual pathway in the pigeon (Columba livia)

Temperature manipulation of neuronal dynamics in a forebrain motor control nucleus

Modeling temperature manipulations in a circular model of birdsong production

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