When a scientist makes predictions about new facts based on existing theories, (s)he has created a new __________

In the three-box model, all incoming information from the outside world must make a brief stop in the sensory register

Indicate whether this statement is true or false.

When ______________ are active, intrafusal muscle fibers become shorter and hence become much more sensitive to changes in muscle length

a. gamma motor neurons b. extrafusal muscle fibers c. alpha motor neurons d. intrafusal muscle fibers