High frequency gamma activity in the left hippocampus predicts visual object naming performance

Hamamé, Carlos M.; Alario, F.‐Xavier; Llorens, Anaïs; Liégeois‐Chauvel, Catherine; Fonseca, Agnès Trébuchon-Da

doi:10.1016/j.bandl.2014.05.007

Cited by 58 publications

(37 citation statements)

References 84 publications

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“…The interpretation of broadband gamma in subcortical structures is less clear, but may similarly represent the sum of local neuronal spiking. Indeed, event-related broadband gamma changes similar to those reported in cortex have been observed in subcortical structures (Ray et al, 2012, Hamame et al, 2014). …”

Section: Discussionsupporting

confidence: 64%

Motor System Interactions in the Beta Band Decrease during Loss of Consciousness

Swann

Hemptinne

Maher³

et al. 2016

Journal of Cognitive Neuroscience

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Communication between brain areas and how they are influenced by changes in consciousness are not fully understood. One hypothesis is that brain areas communicate via oscillatory processes, utilizing network-specific frequency bands, that can be measured with metrics that reflect between-region interactions, such as coherence and phase amplitude coupling (PAC). To evaluate this hypothesis, and understand how these interactions are modulated by state changes, we analyzed electrophysiological recordings in humans at different nodes of one well-studied brain network: the basal ganglia-thalamo-cortical (BGTC) loops of the motor system, during loss of consciousness induced by anesthesia. We recorded simultaneous electrocorticography (ECoG) over primary motor cortex (M1) with local field potentials (LFPs) from subcortical motor regions (either basal ganglia or thalamus) in 15 movement disorder patients during anesthesia (propofol) induction as a part of their surgery for deep brain stimulation. We observed reduced coherence and PAC between M1 and the subcortical nuclei, which was specific to the beta band (~18-24 Hz). The fact that this pattern occurs selectively in beta underscores the importance of this frequency band in the motor system, and supports the idea that oscillatory interactions at specific frequencies are related to the capacity for normal brain function and behavior.

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Section: Discussionsupporting

confidence: 64%

Motor System Interactions in the Beta Band Decrease during Loss of Consciousness

Swann

Hemptinne

Maher³

et al. 2016

Journal of Cognitive Neuroscience

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“…Single-unit activity 16 and local field potential (LFP) in the high frequency band (HFB, 50–250 Hz) 17, 18 indicate that picture concepts are represented in the hippocampus approximately 0.2 s after picture onsets (Fig. 2A).…”

Section: Resultsmentioning

confidence: 99%

Human hippocampal pre-activation predicts behavior

Jafarpour

Piai

Lin

et al. 2017

Sci Rep

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The response to an upcoming salient event is accelerated when the event is expected given the preceding events – i.e. a temporal context effect. For example, naming a picture following a strongly constraining temporal context is faster than naming a picture after a weakly constraining temporal context. We used sentences as naturalistic stimuli to manipulate expectations on upcoming pictures without prior training. Here, using intracranial recordings from the human hippocampus we found more power in the high-frequency band prior to high-expected pictures than weakly expected ones. We applied pattern similarity analysis on the temporal pattern of hippocampal high-frequency band activity in single hippocampal contacts. We found that greater similarity in the pattern of hippocampal field potentials between pre-picture interval and expected picture interval in the high-frequency band predicted picture-naming latencies. Additional pattern similarity analysis indicated that the hippocampal representations follow a semantic map. The results suggest that hippocampal pre-activation of expected stimuli is a facilitating mechanism underlying the powerful contextual behavioral effect.

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“…Patients with right side resections showed no such decline. Direct involvement of the left hippocampus in visual confrontation naming was seen in an intracranial EEG study by Hamame et al (2014). In their study, epilepsy surgical candidates implanted with multi-lead depth electrodes in the head of left hippocampus, showed an increase in hippocampal high frequency gamma activity in the period between picture presentation and word production.…”

Section: Discussionmentioning

confidence: 96%

Distinct functional connectivity of the hippocampus during semantic and phonemic fluency

et al. 2015

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High frequency gamma activity in the left hippocampus predicts visual object naming performance

Cited by 58 publications

References 84 publications

Motor System Interactions in the Beta Band Decrease during Loss of Consciousness

Motor System Interactions in the Beta Band Decrease during Loss of Consciousness

Human hippocampal pre-activation predicts behavior

Distinct functional connectivity of the hippocampus during semantic and phonemic fluency

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