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BACKGROUND GPS analysis of flight trajectories of pigeons can reveal that topographic features influence their flight paths. Recording electrical brain activity that reflects attentional processing could indicate objects of interest that do not cause changes in the flight path. Therefore, we investigated whether crossing particular visual landmarks when(More)
The interaction (synchronization) of activity of the medial prefrontal cortex, hippocampus and basolateral amygdala have been studied in the course of performance of conditioned avoidance reflex. The pre-stimulus expectation period was characterized by low-frequency delta-activity (1-4 Hz) with the source (according to criteria of Granger causality) in the(More)
To study the neurophysiology of large-scale spatial cognition, we analyzed the neuronal activity of navigating homing pigeons. This is not possible using conventional radio-telemetry suitable for short distances only. Therefore we developed a miniaturized data logger ("neurologger") that can be carried by a homing pigeon on its back, in conjunction with a(More)
In order to study the neurophysiology of large-scale spatial cognition, we analyzed the neuronal activity of navigating homing pigeons. This is not possible using conventional radio-telemetry that is suitable for short distances only. Therefore, we developed a miniaturized data logger (" neurologger ") that can be carried by a homing pigeon on its back, in(More)
Long-term potentiation of monosynaptic projections from the ventral hippocampus to the medial prefrontal cortex was accompanied by increases in the power and synchronization of the θ rhythm in the cortex and hippocampus. Independently of changes in the power, increases in synchronization in the θ and δ ranges were seen with minimal expression of the θ(More)
Execution of a conditioned avoidance reflex in rats was associated with the disappearance of the δ rhythm (1–4 Hz) typical of the intersignal period and synchronized between the medial prefrontal cortex and the ventral tegmental area of the midbrain (VTA), and with an increase in the frequency of the synchronized θ rhythm in the same structures and the(More)
The interaction between the medial prefrontal cortex, the ventral hippocampus, and the basolateral amygdala was studied during execution of a conditioned avoidance reflex. Slow δ activity at 1–4 Hz was recorded during the prestimulus period, with a source meeting the “Granger causality” criterion located in the prefrontal cortex, along with a θ rhythm at(More)
The prestimulus expectation period of conditioned avoidance reflex features synchronized Δ-rhythm (1-4 Hz) in the medial prefrontal cortex and the ventral tegmental area (VTA), and synchronized θ-rhythm (6-8 Hz) in the above-mentioned structures and the hippocampus. According to "Granger causality" Δ- and θ-rhythms flow (are predictors) in the direction(More)
The results of the present study show the augmentation of hippocampal-cortical coherence and phase synchronization in theta-frequency and wider (1-15 Hz) low frequency range, during the time-period of LTP of monosynaptic prefrontal cortex focal potentials. The augmentation was detectable only in that activity segments with low to near-zero hippocampal theta(More)