A5070849070- Neural dynamics and brain function
- Visual perception and processing mechanisms
- Neural and Behavioral Psychology Studies
- Advanced Memory and Neural Computing
- Neuroscience and Neuropharmacology Research
- Neuroscience and Neural Engineering
Ernst Strüngmann Institute for Neuroscience
2018-2022
Growing evidence suggests that distributed spatial attention may invoke theta (3-9 Hz) rhythmic sampling processes. The neuronal basis of such attentional is, however, not fully understood. Here we show using array recordings in visual cortical area V4 two awake macaques presenting separate stimuli to the excitatory center and suppressive surround receptive fields (RFs) elicits multi-unit activity (MUA) at 3-6 Hz. This rhythm did depend on small fixational eye movements. In context a task,...
When a visual stimulus is repeated, average neuronal responses typically decrease, yet they might maintain or even increase their impact through increased synchronization. Previous work has found that many repetitions of grating lead to increasing gamma-band Here, we show in awake macaque area V1 both repetition-related reductions firing rate and increases gamma are specific the repeated stimulus. These effects some persistence on timescale minutes. Gamma presented location. Further,...
Neuronal activity in visual area V4 is well known to be modulated by selective attention, and there are reports on lesions leading attentional deficits. However, it remains unclear whether microstimulation can elicit benefits. To test this hypothesis, we performed local explored its spatial time dynamics two macaque monkeys performing a detection task. Microstimulation was delivered via chronically implanted multi-electrode arrays. We found that increases average performance 35% reduces...
In order for organisms to survive, they need detect rewarding stimuli, example, food or a mate, in complex environment with many competing stimuli. These stimuli should be detected even if are nonsalient irrelevant the current goal. The value-driven theory of attentional selection proposes that this detection takes place through reward-associated automatically engaging mechanisms. But how is achieved brain not very well understood. Here, we investigate effect differential reward on multiunit...
Summary Growing evidence suggests that distributed spatial attention may invoke theta (3-9 Hz) rhythmic sampling processes. The neuronal basis of such attentional is however not fully understood. Here we show using array recordings in visual cortical area V4 two awake macaques presenting separate stimuli to the excitatory center and suppressive surround receptive fields elicits multi-unit activity (MUA) at 3-6 Hz. This rhythm did depend on small fixational eye movements. In context a task,...
When a visual stimulus is repeated, average neuronal responses typically decrease, yet they might maintain or even increase their impact through increased synchronization. Previous work has found that many repetitions of grating lead to increasing gamma-band Here we show in awake macaque area V1 both, repetition-related reductions firing rate and increases gamma are specific the repeated stimulus. These effects showed some persistence on timescale minutes. Further, were presented location....
When a visual stimulus is repeated, average neuronal responses typically decrease, yet they might maintain or even increase their impact through increased synchronization. Previous work has found that many repetitions of grating lead to increasing gamma-band Here we show in awake macaque area V1 both, repetition-related reductions firing rate and increases gamma are specific the repeated stimulus. These effects showed some persistence on timescale minutes. Further, were presented location....