I have made a movie about thresholds in dog training. It gives a quick overview of the work that I presented in my webinar for the Pet Professional Guild. (Click here for a complete script of the video; or expand the audio (only) transcript below the video.)
The threshold webinar is still available as a recording ($10 members/$20 non-members of PPG) and I encourage anyone who is interested in thresholds to view it.
Also, I have previously published a blog post on the topic: Thresholds in Dog Training: How Many?
If you are a visual learner, the movie will probably be helpful. I spend a lot of time explaining the diagrams, and have an animation of what happens to the thresholds as we train. The movie also has video examples of dogs and stimuli over the thresholds. (Plus it has a threshold of hearing test! How cool is that?**)
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** For the auditory people, musicians, and nerds among us (I’m all three): I used an iPhone app to generate a high frequency sinusoid (15.5 kHz) and recorded it for the movie. I used an oscilloscope app to make sure that the sound was playing during that part of the movie, through my own computer anyway. It’s just below my threshold of hearing. Younger people can probably hear it, if their computer speakers can generate it.