The effects of four types of deep breaths on the latency, the magnitude and the duration of finger volume pulse, heart rate and galvanic skin responses were studied in a quasi‐learning situation. The respiratory stimuli were normal inspirations, three times deeper than normal, six times deeper and fast, and six times deeper and slow. Twenty Ss took each type of deep breath in random order six times in response to specific lights. Graphs and statistical tests are presented summarizing the above relationships and two unexpected findings are discussed.

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