Arnold B. Scheibel - How Brain Scientists Think About Consciousness

Introduction

In this section, Arne and Robert discuss the brain and its role in human consciousness.

The Brain and Consciousness

• Arne and Robert discuss how the brain is responsible for human consciousness.

• Action is based on input and output, which requires evaluation of sensory input.

• The cerebral hemispheres developed to make cognitive activity possible.

Brain Anatomy

In this section, Arne and Robert discuss the anatomy of the brain.

Brain Orientation

• Arne explains that if the brain were in your head, your forehead would be at the top.

• They examine a brain specimen that has lost its body.

Information Processing in the Brain

In this section, Arne and Robert discuss how information is processed in the brain.

Two Informational Components

• There are two basic kinds of information that come into the brain: qualia (components of individual experience), and intensity (how much significance it has to me).

• There are two parallel systems: specific information streams up through fiber bundles or tracts entering eventually after many relays entering the cortex; while a second system occupies the central core of this so-called brain stem carrying general signatures of information.

Reticular Formation

• The reticular formation helps establish priorities by monitoring our attention.

• It disregards stimuli that are not a threat to us.

Conscious Experience

• One of the basic foundations of what we call conscious experience lies in this reticular core of the brain stem and its modulation of entire brain.

Conclusion

In this section, Arne and Robert discuss that the cortex becomes the repository not only of the immediate momentary experience but is and has been the repository of...

Cortex

• The cortex becomes the repository not only of the immediate momentary experience but is and has been the repository of...

The Hippocampal Dentate Complex and Memory

This section discusses the hippocampal dentate complex and how it generates a specific pattern of synaptic activities that work on DNA systems to produce new proteins and structural changes, which are responsible for laying down memories. Patients with bilateral damage to their hippocampus lose the capacity to lay down new memories.

The Hippocampal Dentate Complex

• The hippocampal dentate complex generates a specific pattern of synaptic activities that work on DNA systems.

• These activities produce new proteins and structural changes that are responsible for laying down memories.

Bilateral Damage to the Hippocampus

• Patients with bilateral damage to their hippocampus lose the capacity to lay down new memories.

• They can remember events from before their injury but cannot form new memories.

• This condition is like living in "Groundhog Day," where every day is a brand-new experience.

• Patients with this condition have been studied extensively by neuroscientists, providing valuable insights into brain function.

The Limbic System and Emotion

This section discusses the limbic system's role in generating emotional experiences. The amygdala, located under the medial surface of the brain, establishes an experience's emotional valence by deciding if it is potentially dangerous or pleasant. It also helps us read facial expressions and pick up social cues.

The Amygdala's Role in Emotional Valence

• The amygdala establishes an experience's emotional valence by deciding if it is potentially dangerous or pleasant.

• For example, when we see something coiled under a tree in a tropical rainforest, our amygdala warns us off until further cortical activity evaluates whether it is dangerous or not.

• Another example is reading facial expressions, where the amygdala helps us draw conclusions about a person's emotional state.

The Limbic System and Social Cues

• The amygdala works through the hypothalamus to send fight signals when it detects confrontational behavior.

• In the animal kingdom, an alpha male or female is never challenged by looking them directly in the eye because this is confrontational, and the amygdala picks that up immediately.

• In humans, visual confrontation has developed a different meaning, but the limbic lobe with the amygdala generates emotional context on a moment-to-moment basis.

The Role of Emotions in Decision Making

In this section, the speakers discuss the importance of emotions in decision making and how they are integrated with cognitive processes.

Emotional Validity

• Emotionally valid individuals can express their emotions and control them.

• Individuals with certain diseases or syndromes may have difficulty expressing or controlling their emotions due to interruptions in the system.

• Electrical storms in the amygdala can cause sociopathic behavior, which raises questions about free will, responsibility, and legal liabilities.

The Limbic System

• The limbic system adds emotional context to everything we experience.

• It is responsible for integrating feeling tones with cognitive personality components.

• This system is what makes us human and unique.

Integration of Emotions and Cognition

• Unlikely connections between the pre-frontal cortex and limbic system allow for integration of feelings and thoughts.

• These connections allow us to make decisions about the future while also considering our emotional responses.

• Our signature as individuals comes from this integration.