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Thalamic-Medial Temporal Lobe Connectivity Underpins Familiarity Memory
Alex Kafkas1, Andrew R Mayes1, Daniela Montaldi1
1School of Biological Sciences, Division of Neuroscience & Experimental Psychology, University of Manchester, UK.
Cerebral Cortex (New York, N.Y. : 1991)
|January 29, 2020
Summary
The mediodorsal thalamus (MDt) and anterior thalamus play general roles in memory familiarity and recollection, respectively. Thalamic connectivity with the medial temporal lobe (MTL) is crucial for memory confidence.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Memory Research
Background:
- The thalamus is critical for memory, but its specific roles and connectivity with the medial temporal lobe (MTL) are not fully understood.
- Recognition memory involves familiarity and recollection, yet the neural underpinnings of these processes across different memory materials remain unclear.
Purpose of the Study:
- To investigate the distinct roles of thalamic nuclei in familiarity and recollection.
- To examine the functional connectivity between the thalamus and MTL in recognition memory.
- To determine if thalamic-MTL interactions are critical for memory confidence.
Main Methods:
- Used fMRI during a recognition memory task assessing familiarity and recollection for objects, faces, and scenes.
- Analyzed functional connectivity between thalamic nuclei and MTL regions.
- Correlated brain activity and connectivity with familiarity confidence ratings.
Main Results:
- The mediodorsal thalamus (MDt) showed a material-general role in familiarity, while the anterior thalamus was involved in recollection.
- Material-specific regions for scene familiarity (ventral posteromedial, pulvinar) and face familiarity (left ventrolateral thalamus) were identified.
- Increased functional connectivity between MDt and MTL (parahippocampal cortex, perirhinal cortex) correlated with higher familiarity confidence.
Conclusions:
- Familiarity signals are generated by dynamic interactions between MTL and thalamic structures.
- Thalamic nuclei exhibit both material-general and material-specific roles in memory processing.
- Thalamic connectivity with the MTL is essential for subjective confidence in recognition memory.
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