Lecture Notes on Motion Perception and Brain Anatomy

Key Concepts in Motion Perception

Animals exhibit motion perception for survival:
- Avoiding threats or catching prey.
Unique human ability: Precision throwing.
Importance of visual motion discussed:
- Ability to detect small details and emotional expressions in faces.
- Role of motion in social interactions.

Difficulty in discerning emotions from static facial expressions due to:
- Subtlety of facial micro-expressions.
- Importance of temporal frequency in motion detection.

Potential allocation of specialized brain machinery for processing motion.
Life without motion perception may hinder daily activities (e.g., crossing streets).
Discussion of the implications of living in a "strobe world".

Human brain: Approximately 100 billion neurons.
Structure of a neuron:
- Cell body, nucleus, axon, and dendrites.
- Myelin sheath for faster signal conduction.
Brain's energy efficiency: 20 watts compared to IBM's Watson, which runs on 20,000 watts.

Cortex: Wrapping sheet around the brain.
Brain Stem:
- Primitive part controlling basic functions (breathing, consciousness).
- Essential for survival.
Cerebellum:
- Involved in motor coordination; potential involvement in cognition.
Limbic System: Includes important structures for memory and emotion.

Thalamus:
- Acts as a relay station for sensory information.
- Many connections go back from cortex to thalamus, suggesting active processing rather than mere relay.
Hippocampus:
- Critical for episodic memory and navigation.
- Case studies (H.M. and Lonnie Sue Johnson) highlight the importance of this structure in memory retention and sense of self.
Amygdala:
- Key role in experiencing and recognizing emotions, particularly fear.
- Example of patient SM without amygdala highlights its function in fear recognition.

Composed of myelinated axons connecting different brain regions.
Important for understanding the organization of cortical areas and their connectivity.
45% of the human brain's volume.

Distinct functions, connectivity, and sometimes physical differences define cortical areas.
Primary Sensory Regions:
- Each has specific maps (retinotopy in visual cortex, somatotopic map in somatosensory cortex, frequency maps in auditory cortex).
Example of Visual Area MT:
- Involved in motion processing; evidence comes from neuronal selectivity for motion direction.

Use of electrophysiology and fMRI to investigate activity and connectivity in different brain regions.
Importance of both individual neuron recordings and broader behavioral data to infer function.