Early Behavior

My other websites:   My Dysfunctional Family  Subcortical Brain    
Children of the Amphioxus         Boys without Fathers       
Brain of the Tiger Salamander       Herrick Update   

Since the most easily observable behavior is locomotion, I'll look at that first.    

My central focus has always been human behavior.  Since my BA in math was focused on the construction of complex deductive structures from simple building blocks such as axioms, I've taken a similar approach to human behavior. 

I've located quite a lot of information, but it's scattered through several different pages.   Fitting all that scattered information into a coherent whole has proven quite difficult, so, for the moment, I'm going to just put the links in their approximate evolutionary order.   

Central Pattern Generators     
Pre-Bilateria Locomotion      
Bilateria Locomotion  
Chordates   Pre-Chordate Locomotion   Chordate Locomotion   

Learned Behavior    

Amphioxus Motor Nerves    Motor Nerve Organization      
Ventral Motor Neurons      Dorsal Motor Neurons    
Primary Motor Center
Amphioxus Fast-Slow Twitch    
Amphioxus Locomotion       Amphioxus Behavior  

Lamprey      Lamprey Locomotion       
Spinal Locomotor Generator      

Salamander Locomotion     

Perinatal Behavior  
Motor Programs      

Adult Behavior 

Predatory Behavior    
Teleost Prey Catching   

Mesencephalic Locomotor Region    
Nucleus Accumbens Septi          

Locomotion Sequence   

The earliest forms of behavior are listed in  Pre-Bilateria Locomotion .   

Bilateria Locomotion :   According to 'Back in time' in  Bilateria   , the first  Bilateria   was the common ancestor of  cnidarians , a phyla of the Coelenterata , and  Flat Worms   .   The Flat Worms   are already capable of quite complex behavior.   

Central Pattern Generators   :   Swimming seems to begin with the  Bilateria   before the evolution of the Deuterostomes from the ProtostomesPre-Chordate Locomotion

As discussed in Chordate Locomotion , the amphioxus and all other Chordates swim during at least part of their life cycle.   
See:  Amphioxus Locomotion .   

Chordate swimming is generated by the  Spinal Locomotor Generator

Movement of the four limbs is generated by the  Mesencephalic Locomotor Region    

The Superior Colliculus   allows sensory input to shape behavior.   

Nucleus Accumbens Septi looks at the mechanisms for choosing between different potential behaviors.  As pointed out in  Lamprey Nucleus Accumbens   at least some of this mechanism predates the evolution of the cortex.  Lamprey Locomotion         

Brain of the Tiger Salamander   provides an extremely detailed description of Salamander neuroanatomy.    

ErlyB Home

140622 - 1333   modified 

Subpages (1): Salamander Locomotion