Executive Function Computational Cognitive Neuroscience Randall O’Reilly.

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Presentation transcript:

Executive Function Computational Cognitive Neuroscience Randall O’Reilly

Who is in Charge of your Brain?? Prefrontal Cortex? Integrates: Cognitive Control Planning Motivation Reward processing Decision making

Key Idea: Top-Down Biasing PFC active maintenance provides top-down biasing of posterior-cortical processing

The Homunculus Problem

It Takes a Network..

PFC Does Active Maintenance

Active Maintenance Can Do it All Cognitive Control  Maintained activity drives top-down biasing Planning  Think about things that are not there (future) Motivation  Maintain goals Reward processing  Maintain possible outcomes Decision making  Maintain alternatives

The Need for Robust Maintenance "Every sound has to be an earthquake or tidal wave that topples governments and changes national boundaries and mutates whole species so they suddenly drift off the planet, across galaxies, only to return, years later, when nobody wants to know them cause their credit rating's bad or because they can't do the Mashed Potatoes.” - MFU by HC, 1998 Subjective experience of PFC lesion: dreaming!

Stroop Task: Top Down Biasing RED

Stroop Task: Top Down Biasing GREEN

Stroop Task: Top Down Biasing RED

Stroop Task: Top Down Biasing GREEN

Asymmetric Conflict

Robust Active Maintenance In Stroop model, we just clamp PFC units on.. What makes them “clamped” in the real brain? BG!

Motor Gating => Cognitive Gating

Dynamic, Adaptive Gating (BG) Toggles PFC bistable states Resembles transistor logic gate!

PBWM System

Getting Loopy / Higher..

Biological Basis of PBWM

Executive Function 20

WHIP Model