MENU

Context-Dependent Representation of Memory and Choice in the Human Brain

Presented at: Neuroscience 2022
C.E. Credits: P.A.C.E. CE Florida CE
Speaker

Abstract

Behavior in complex environments requires decisions that flexibly combine stimulus representations with context, goals, and memory. Two key aspects of such cognitive flexibility are the retrieval of information from memory when needed, and the ability to selectively utilize relevant information depending on task demands. These aspects, it is believed, depend on the medial frontal cortex (MFC) and the medial temporal lobe (MTL), but it is unclear how these structures interact during memory retrieval. To study this, we simultaneously recorded single neurons in MFC and MTL while human subjects alternated between making memory and categorization-based decisions. In our population analysis, we compared the neural representations of choice, familiarity, and image category across tasks using cross-condition generalization performance. We found a striking difference between brain areas: In the MTL, representations of stimulus familiarity and stimulus category were task-demand independent, whereas in the MFC, representations of stimulus familiarity, stimulus category, and choices were all highly sensitive to task demands. Choice representations in the MFC were also task-specific but not effector specific. Lastly, choices requiring memory retrieval selectively engaged phase-locking between theta-frequency band oscillations in MTL and MFC neurons. This work reveals a mechanism for selectively engaging memory retrieval and shows that, unlike perceptual decision-making, memory-related information is only represented in the medial frontal cortex when choices require it.

Learning Objectives:

1. Demonstrate the importance of studying neural representations across multiple tasks.

2. Introduce cross-task decoding and multi-dimensional scaling as quantitative and qualitative (respectively) measures of generalization performance.

3. Demonstrate task-specific interareal communication between the medial temporal lobe and medial frontal cortex.


Show Resources
You May Also Like
JUL 19, 2022 8:00 AM PDT
JUL 19, 2022 8:00 AM PDT
Date: July 19, 2022 Time: 8:00am (PDT), 11:00pm (EDT), 5:00pm (CEST) Traditional liver perfusion procedures are difficult to perform and require extensive training, steady hands, and long-st...
JUN 21, 2022 6:00 AM PDT
JUN 21, 2022 6:00 AM PDT
Date: June 21, 2022 Time: 6:00am (PDT), 9:00am (EDT), 3:00pm (CEST) The global understanding and practice of medicine is currently undergoing a revolutionary change. This shift to precision...
JUN 28, 2022 6:45 AM PDT
JUN 28, 2022 6:45 AM PDT
Date: June 28, 2022 Time: 3:00pm (BST), 4:00pm (CET), 9:00am (CST), 7am (PST) Light-sheet microscopy is an extremely versatile imaging technique with a vast range of implementations that are...
MAY 19, 2022 8:00 AM PDT
MAY 19, 2022 8:00 AM PDT
Date: May 19, 2022 Time: 8:00am (PDT), 11:00pm (EDT), 5:00pm (CEST) Mass spectrometry (MS)-based proteomic technologies are increasingly applied in a clinical context for disease classific...
MAY 17, 2022 9:00 AM PDT
MAY 17, 2022 9:00 AM PDT
Date: May 17, 2022 Time: 9:00am (PDT), 12:00pm (EDT), 8:00pm (CEST) Gene therapeutics have great potential to treat many severe diseases in an unprecedented, targeted manner. The biopharmace...
MAR 29, 2022 9:00 AM PDT
C.E. CREDITS
MAR 29, 2022 9:00 AM PDT
Date: March 29, 2022 Time: 09:00am (PDT), 12:00pm (EDT), 17:00 (GMT) Advances in molecular and immunodiagnostics are enabling a personalized, high-precision approach to health in many clin...
Loading Comments...
Show Resources