Interestingly, this effect is also conserved in the MB neurons

of both these mutants. Thus, our study suggests that alterations in cAMP-mediated GABAergic plasticity, particularly in the MB neurons of cAMP mutants, account for their defects in olfactory learning. “
“Intracortical axons originating from pyramidal cells in layer 3 of the rat somatosensory cortex are shared between adjacent columns, and receive the presynaptic inhibition that is mediated by the GABAB receptor. Synaptic actions by intracortical axons of single layer 3 pyramidal cells covary between the two adjacent columns in response to stimulation of layer 3 of either column. We examined whether GABAB receptor-mediated presynaptic inhibition affects the covariability of synaptic actions by intracortical axons between adjacent columns in slice preparations of the rat barrel cortex. Bortezomib in vivo Paired stimulations of superficial layer 3 evoked first and second excitatory postsynaptic Veliparib solubility dmso currents

(EPSCs) of varying amplitudes, yielding varying paired-pulse depression of EPSCs in layer 3 pyramidal cells that were located in the stimulated column, but not in its adjacent column. The amplitude of the second EPSC was inversely proportional to that of the first EPSC in layer 3 pyramidal cells in the stimulated column, yielding a negative correlation coefficient between the first and second EPSCs. Baclofen and CGP55845 attenuated paired-pulse depression and abolished the inverse relationship. Simultaneous recordings from two layer 3 pyramidal cells in the stimulated and adjacent columns revealed a positive correlation between the paired first EPSC amplitudes and a negative correlation between the paired second EPSC amplitudes, which, respectively, indicate the positive and negative covariability of synaptic nearly actions by intracortical axons between the two adjacent columns. These results suggest that GABAB receptor-mediated presynaptic inhibition can reverse the positive covariability of inter-columnar synaptic actions, which may serve as a basis for inter-columnar desynchronisation. “
“The updating of

visual space across saccades is thought to rely on efference copies of motor commands. In humans, thalamic lesions impair performance on a saccadic double-step task, which requires the use of efference copy information, and the altering of saccade-related efference copy processing. This deficit is attributed to disruption of a pathway from the superior colliculus to the frontal eye field. However, the cerebellum is probably also involved in efference copy processing, due to its pivotal role for predictive motor control. The present study investigated the processing of efference copy information in eight patients with focal cerebellar lesions and 22 healthy controls by means of a saccadic double-step task with simultaneous event-related potential recording.