Prefrontal Cortex Lecture Notes

What is the primary function of the prefrontal cortex?

It performs higher-level functions such as decision making, working memory, and emotional processing.

Where is the prefrontal cortex located in the brain hierarchy?

At the top of the mouse brain hierarchy.

What distinguishes agranular prefrontal areas?

They lack a well-defined Layer 4 and are shared by all mammals.

Which prefrontal areas are involved in sensorimotor mapping?

Dorsomedial prefrontal areas.

How do ventromedial prefrontal areas influence choices?

They bias choices based on internal signals.

What role do ventrolateral prefrontal areas play?

They bias choices of objects based on external signals.

Name a higher-level function performed by the mouse prefrontal cortex.

Working memory.

What is the significance of working memory in the prefrontal cortex?

It involves maintaining and manipulating information temporarily.

How is working memory physiology currently understood?

It involves projections from the medial dorsal thalamic nucleus to prefrontal cortex.

What triggers prefrontal cells to fire during working memory tasks?

Neural activity and bursts during a delay period.

What characterizes the prefrontal areas of primates compared to other mammals?

They possess granular prefrontal areas.

What cognitive flexibility benefits do granular prefrontal areas provide?

Learning context-specific contingencies and abstract rule usage.

What is an example of an emotional function performed by the prefrontal cortex?

Fear expression.

What is the role of the anterior cingulate area in the prefrontal cortex?

It is involved in decision making and emotional regulation.

Which structures project to the dorsomedial prefrontal cortex?

Sensory and motor areas of the cortex and thalamus.

Which areas are included in the ventromedial prefrontal cortex?

Paralimbic, infralimbic, and medial orbitofrontal areas.

How do the ventromedial prefrontal areas function?

They drive decisions based on learned associations.

What kind of information do ventrolateral prefrontal cells encode?

Outcome predictions related to sensory aspects of rewards.

How do lesions in the ventrolateral prefrontal cortex affect behavior?

They abolish the devaluation effect of illness on food.

How is the connectivity of the prefrontal cortex organized?

It is clustered into modules based on connectivity types.

What are the structural features of agranular prefrontal areas?

They lack the granular layer present in other cortical areas.

What is the association between the prefrontal cortex and social cognition?

It is involved in social recognition and understanding dominance hierarchies.

What are the components of the mouse prefrontal cortex?

Dorsomedial, ventromedial, and ventrolateral areas.

What processes are associated with ventromedial prefrontal cortex activity?

Choices based on stimulus-response associations and devaluation sensitivity.

How do prefrontal cortex areas process external signals?

They receive sensory inputs to guide choices.

Why are prefrontal areas critical for predicting outcomes?

They encode expected consequences of actions or stimuli.

What type of connectivity characterizes the prefrontal cortex?

Strong connections within its subdivisions.

What aspects of memory are prefrontal areas involved in?

Working memory and decision-making processes.

How do granule and agranular prefrontal areas differ?

Granular areas have a defined Layer 4, while agranular areas do not.

What role do feedforward and feedback connections play in the prefrontal cortex?

They contribute to its hierarchical organization.

What factors influence the firing patterns of prefrontal cells?

Task demands and ongoing memory maintenance.

How do the environmental adaptations relate to granular prefrontal areas?

They enhance cognitive flexibility in relation to ecological niches.

What kind of studies have explored the functions of working memory in the prefrontal cortex?

Research by Bolkan et al., 2017 and Wilhelm et al., 2023.

What behavioral knowledge does the prefrontal cortex contribute to in social contexts?

Recognition of familiar individuals and hierarchy position.

How do prefrontal areas interact with the striatum?

They project to the striatum and influence motor control.

What is the role of the orbitofrontal cortex in choice?

It biases object choice based on sensory cues.

What does the term 'sensorimotor mapping' refer to?

The integration of sensory information with motor outputs.

How does the amygdala interact with the prefrontal cortex?

It provides emotional context to decision-making processes.

What is the primary output destination for ventromedial prefrontal areas?

They project largely to the striatum.

What cognitive task illustrates the importance of working memory in mice?

Performing correct responses in working memory tasks.

What is the significance of emotional functions in prefrontal processing?

They inform decision-making based on past experiences.

How do prefrontal areas contribute to emotional regulation?

By integrating emotions with cognitive processes.

What does contextual discrimination involve in prefrontal function?

Distinguishing between different situational cues during judgement.

What is the modern understanding of granular prefrontal areas in relation to primates?

They are thought to support cognitive advancements in problem-solving.

What is a consequence of damage to the prefrontal cortex?

Difficulties in decision-making and social behavior.

What types of stimuli do ventrolateral prefrontal areas respond to?