A GABAergic tecto-tegmento-tectal pathway in pigeons.
Journal of Comparative Neurology 524(14):2886 (2016)
Previous studies have demonstrated that the optic tecta of the left and right brain halves reciprocally inhibit each other in birds. In mammals, the superior colliculus receives inhibitory γ-aminobutyric acid (GABA)ergic input from the basal ganglia via both the ipsilateral and the contralateral...
Stress and laterality - The comparative perspective.
Physiology & Behavior 164(Pt A):321 (2016)
Functional hemispheric asymmetries can vary over time and steroid hormones have been shown to be one of the factors that can modulate them. Research into this matter has mainly focused on sex steroid hormones (androgens, estrogens and progestogens), although there is increasing evidence that glu...
An interplay of fusiform gyrus and hippocampus enables prototype- and exemplar-based category learning.
Behavioural Brain Research 311:239 (2016)
The aim of the present study was to examine the contributions of different brain structures to prototype- and exemplar-based category learning using functional magnetic resonance imaging (fMRI). Twenty-eight subjects performed a categorization task in which they had to assign prototypes and exce...
Intrahemispheric white matter asymmetries: the missing link between brain structure and functional lateralization?
Reviews in the Neurosciences 27(5):465 (2016)
Hemispheric asymmetries are a central principle of nervous system architecture and shape the functional organization of most cognitive systems. Structural gray matter asymmetries and callosal interactions have been identified as contributing neural factors but always fell short to constitute a f...
A three-dimensional digital atlas of the starling brain.
Brain Structure and Function 221(4):1899 (2016)
Because of their sophisticated vocal behaviour, their social nature, their high plasticity and their robustness, starlings have become an important model species that is widely used in studies of neuroethology of song production and perception. Since magnetic resonance imaging (MRI) represents a...
Functional organization of telencephalic visual association fields in pigeons.
Behavioural Brain Research 303:93 (2016)
Birds show remarkable visual abilities that surpass most of our visual psychophysiological abilities. In this study, we investigated visual associative areas of the tectofugal visual system in pigeons. Similar to the condition in mammals, ascending visual pathways in birds are subdivided into pa...
Cognition without Cortex.
Trends in Cognitive Sciences 20(4):291 (2016)
Assumptions on the neural basis of cognition usually focus on cortical mechanisms. Birds have no cortex, but recent studies in parrots and corvids show that their cognitive skills are on par with primates. These cognitive findings are accompanied by neurobiological discoveries that reveal avian ...
Asymmetric top-down modulation of ascending visual pathways in pigeons.
Neuropsychologia 83:37 (2016)
Cerebral asymmetries are a ubiquitous phenomenon evident in many species, incl. humans, and they display some similarities in their organization across vertebrates. In many species the left hemisphere is associated with the ability to categorize objects based on abstract or experience-based beha...
Memory-updating abrogates extinction of learned immunosuppression.
Brain, Behavior, and Immunity 52:40 (2016)
When memories are recalled, they enter a transient labile phase in which they can be impaired or enhanced followed by a new stabilization process termed reconsolidation. It is unknown, however, whether reconsolidation is restricted to neurocognitive processes such as fear memories or can be exte...
Connectivity and neurochemistry of the commissura anterior of the pigeon (Columba livia).
Journal of Comparative Neurology 524(2):343 (2016)
The anterior commissure (AC) and the much smaller hippocampal commissure constitute the only interhemispheric pathways at the telencephalic level in birds. Since the degeneration study from Zeier and Karten (), no detailed description of the topographic organization of the AC has been performed....
Cryptochrome 1b: a possible inducer of visual lateralization in pigeons?
European Journal of Neuroscience 43(2):162 (2016)
The visual system of adult pigeons shows a lateralization of object discrimination with a left hemispheric dominance on the behavioural, physiological and anatomical levels. The crucial trigger for the establishment of this asymmetry is the position of the embryo inside the egg, which exposes th...
Editorial: Extinction Learning from a Mechanistic and Systems Perspective.
Frontiers in Behavioral Neuroscience 10:115 (2016)
Categories in the pigeon brain: A reverse engineering approach.
Journal of the Experimental Analysis of Behavior 105(1):111 (2016)
Pigeons are well known for their visual capabilities as well as their ability to categorize visual stimuli at both the basic and superordinate level. We adopt a reverse engineering approach to study categorization learning: Instead of training pigeons on predefined categories, we simply present ...
The Neural Basis of Long-Distance Navigation in Birds.
Physiology 78:133 (2016)
Migratory birds can navigate over tens of thousands of kilometers with an accuracy unobtainable for human navigators. To do so, they use their brains. In this review, we address how birds sense navigation- and orientation-relevant cues and where in their brains each individual cue is processed. ...
Distribution of serotonin 5-HT1A-binding sites in the brainstem and the hypothalamus, and their roles in 5-HT-induced sleep and ingestive behaviors in rock pigeons (Columba livia).
Behavioural Brain Research 295:45 (2015)
Serotonin 1A receptors (5-HT1ARs), which are widely distributed in the mammalian brain, participate in cognitive and emotional functions. In birds, 5-HT1ARs are expressed in prosencephalic areas involved in visual and cognitive functions. Diverse evidence supports 5-HT1AR-mediated 5-HT-induced i...
Laterality and mental disorders in the postgenomic age--A closer look at schizophrenia and language lateralization.
Neuroscience & Biobehavioral Reviews 59:100 (2015)
Most people are right-handed and show left-hemispheric language lateralization, but a minority exhibits left-handedness and right-hemispheric language lateralization. This atypical laterality pattern is observed significantly more often in schizophrenia patients than in the general population, w...
Network structure of functional hippocampal lateralization in birds.
Hippocampus 25(11):1418 (2015)
Functional hemispheric asymmetry is a common feature of vertebrate brain organization, yet little is known about how hemispheric dominance is implemented at the neural level. One notable example of hemispheric dominance in birds is the leading role of the left hippocampal formation in controllin...
Current Biology 25(20):R970 (2015)
Current Biology 25(20):R970 (2015)
Onur Güntürkün in Q&A.
Abnormal interhemispheric motor interactions in patients with callosal agenesis.
Behavioural Brain Research 293:1 (2015)
During unilateral hand movements the activity of the contralateral primary motor cortex (cM1) is increased while the activity of the ipsilateral M1 (iM1) is decreased. A potential explanation for this asymmetric activity pattern is transcallosal cM1-to-iM1 inhibitory control. To test this hypoth...