From the experiment with the pendulum clock (thought meter)Wundt concluded:

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Wundt's experiment with the pendulum clock (thought meter) led him to conclude that experimental psychology must stress selective attention or volition. He believed that the measurement of reaction times and attention to simple stimuli were not enough to fully understand complex mental processes. Instead, he emphasized the importance of studying higher cognitive processes such as attention, intellect, and will.

From the Experiment with the Pendulum Clock (Thought Meter)Wundt Concluded