Alyssa is feeling anxious and stressed. Which of the following would most effectively boost her mood by increasing the availability of neurotransmitters such as norepinephrine, serotonin, and the endorphins? a. biofeedback
b. relaxation training
c. mindfulness meditation
d. aerobic exercise

aerobic exercise

Explanation:

this is because it increases endorphins

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

since learning about his learning patterns, logan has become very aware of the thoughts and feelings he experiences as he listens to the “internal chatter” of his patterns.