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12/11/2018 Ole Jensen 12/11/2018 The role of occipital gamma activity in humans: from working memory to consolidation Ole Jensen F.C. Donders Centre for.

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Presentation on theme: "12/11/2018 Ole Jensen 12/11/2018 The role of occipital gamma activity in humans: from working memory to consolidation Ole Jensen F.C. Donders Centre for."— Presentation transcript:

1 12/11/2018 Ole Jensen 12/11/2018 The role of occipital gamma activity in humans: from working memory to consolidation Ole Jensen F.C. Donders Centre for Cognitive Neuroimaging Nijmegen, The Netherlands

2 The binding problem solved by neuronal synchronization
12/11/2018 The binding problem solved by neuronal synchronization Ole Jensen 12/11/2018 from Engel et al.

3 Intracranial recordings revealing neuronal synchronization
12/11/2018 Intracranial recordings revealing neuronal synchronization Ole Jensen 12/11/2018 1 2 fgamma ~ Hz

4 Gamma synchronization in cats
12/11/2018 Gamma synchronization in cats Ole Jensen 12/11/2018 fgamma ~ Hz Gray et al. (1989) Nature

5 Varela et al. (2001) Nat Rev Neuro
12/11/2018 Varela et al. (2001) Nat Rev Neuro

6 Induced gamma activity in humans reflecting perception
12/11/2018 Induced gamma activity in humans reflecting perception Ole Jensen 12/11/2018 Tallon-Baudry et al. (1997) J Neurosci

7 Induced gamma activity in humans reflecting perception
12/11/2018 Induced gamma activity in humans reflecting perception Ole Jensen 12/11/2018 Tallon-Baudry et al. (1997) J Neurosci

8 Neurons synchronized at gamma provides a stronger ‘forward drive’
12/11/2018 Neurons synchronized at gamma provides a stronger ‘forward drive’ Ole Jensen 12/11/2018 Jensen et al. (2007) TINS

9 Synchronization in the gamma band reflects visual representations
12/11/2018 Ole Jensen 12/11/2018 Synchronization in the gamma band reflects visual representations

10 12/11/2018 MEG Ole Jensen 12/11/2018 275 axial gradiometers

11 WM maintenance Baddeley and Hitch (1974) 12/11/2018
Ole Jensen 12/11/2018 Baddeley and Hitch (1974)

12 WM maintenance by gamma
12/11/2018 Ole Jensen 12/11/2018 Jensen et al. (2007) TINS

13 Face identify vs. orientation
12/11/2018 Face identify vs. orientation Ole Jensen 12/11/2018 Jensen and Jokisch (2007) J Neurosci

14 . . . . . . face orientation face identify dorsal ventral
12/11/2018 face orientation Ole Jensen 12/11/2018 . . . dorsal ventral face identify . . . Jensen and Jokisch (2007) J Neurosci

15 Gamma increases when engaging dorsal
12/11/2018 Gamma increases when engaging dorsal but not ventral stream Face identity Face orientation Jensen and Jokisch (2007) J Neurosci

16 Gamma sources in primary visual cortex
12/11/2018 Gamma sources in primary visual cortex Ole Jensen 12/11/2018 Face Orientation - Identity Jensen and Jokisch (2007) J Neurosci

17 Gamma increases when engaging dorsal
12/11/2018 Gamma increases when engaging dorsal but not ventral stream Face identity Face orientation RTidentity > RTorientation !!! Jensen and Jokisch (2007) J Neurosci

18 Alpha increases when engaging ventral but not dorsal stream
12/11/2018 Face identity Face orientation Jensen and Jokisch (2007) J Neurosci

19 Alpha sources in parieto-occipital cortex
12/11/2018 Alpha sources in parieto-occipital cortex ID: face identity OR: face orientation CO: control Jensen and Jokisch (2007) J Neurosci

20 - Gamma reflects WM maintenance (not task demands!)
12/11/2018 dorsal - ventral Gamma reflects WM maintenance (not task demands!) Alpha reflects inhibition

21 Encoding and recall from long-term memory
12/11/2018 Ole Jensen 12/11/2018 Encoding and recall from long-term memory

22 Synaptic encoding of long-term memory
12/11/2018 Synaptic encoding of long-term memory Ole Jensen 12/11/2018

23 Synaptic encoding of long-term memory
12/11/2018 Synaptic encoding of long-term memory Ole Jensen 12/11/2018 Encoding: Synaptic modification by LTP is enforced by multiple repetitions Recall: How to “read-out” of synaptically encoded representations?

24 Long-term memory study
12/11/2018 Ole Jensen 12/11/2018 240 pictures 240 old pictures 240 new pictures Osipova et al. (2006) J Neurosci

25 Long-term memory study
12/11/2018 Ole Jensen 12/11/2018 240 pictures 240 old pictures 240 new pictures Osipova et al. (2006) J Neurosci

26 Encoding: gamma band power
12/11/2018 Encoding: gamma band power Ole Jensen 12/11/2018 Osipova et al. (2006) J Neurosci

27 Encoding: gamma band power
12/11/2018 Encoding: gamma band power Ole Jensen 12/11/2018 Osipova et al. (2006) J Neurosci

28 Theta During Successful Encoding
12/11/2018 Theta During Successful Encoding Osipova, Takashima, Fernandez and Jensen (2006) J Neuroscience

29 Long-term memory study
12/11/2018 Ole Jensen 12/11/2018 240 pictures 240 old pictures 240 new pictures Osipova et al. (2006) J Neurosci

30 Retrieval: gamma band power
12/11/2018 Ole Jensen 12/11/2018 Osipova et al. (2006) J Neurosci

31 Retrieval: gamma band power
12/11/2018 Ole Jensen 12/11/2018 Osipova et al. (2006) J Neurosci

32 Encoding Recognition Occipital gamma provides
12/11/2018 Ole Jensen 12/11/2018 Encoding Recognition Occipital gamma provides a drive to association areas facilitating synaptic encoding Gamma reflects a ‘pattern completion’ process in visual areas (“read-out” from synaptic encoding)

33 12/11/2018 Ole Jensen 12/11/2018 Changes in expression of long-term memory representations with stabilization

34 Face - Location association
12/11/2018 Ole Jensen 12/11/2018 Nieuwenhuis et al. (2008) Neuroimage

35 Training Nieuwenhuis et al. (2008) Neuroimage 12/11/2018
Ole Jensen 12/11/2018 Nieuwenhuis et al. (2008) Neuroimage

36 Induced gamma during recall
12/11/2018 Induced gamma during recall Ole Jensen 12/11/2018 Nieuwenhuis et al. (2008) Neuroimage

37 Gamma reduced with LTM stabilization
12/11/2018 Ole Jensen 12/11/2018 Nieuwenhuis et al. (2008) Neuroimage

38 Stabilization reflected in occipital areas
12/11/2018 Ole Jensen 12/11/2018 Nieuwenhuis et al. (2008) Neuroimage

39 LTM recall – labile versus stable representations
12/11/2018 LTM recall – labile versus stable representations Ole Jensen 12/11/2018 Labile (new) Stable See also fMRI study by Takashima et al. (2006) Learning and memory. Nieuwenhuis et al. (2008) Neuroimage

40 Conclusion Gamma activity reveals that early visual areas
12/11/2018 Conclusion Ole Jensen 12/11/2018 Human gamma activity can be detected and localized using MEG Sustained gamma during working memory maintenance Visual gamma reflect successful LTM encoding and recall Reliance on visual areas decreases with memory stabilization Gamma activity reveals that early visual areas are engaged in memory tasks (to a larger degree than observed by fMRI)

41 FieldTrip toolbox: http://www.fcdonders.ru.nl/fieldtrip
12/11/2018 Ole Jensen 12/11/2018 Dr. Daniel Jokisch Gamma and alpha activity in working memory Ingrid Nieuwenhuis Gamma and memory stabilization Dr. Atsuko Takashima Theta/gamma during declarative memory Gamma and memory stabilization Dr. Dasha Osipova Theta/gamma during declarative memory FieldTrip toolbox:

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