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In page Psychophysiology:

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A psychophysiologist may look at how exposure to a stressful situation will produce a result in the cardiovascular system such as a change in heart rate (HR), vasodilation/vasoconstriction, myocardial contractility, or stroke volume.[citation needed] Overlaps in areas of interest between psychophysiologists and physiological psychologist may consist of observing how one cardiovascular event may influence another cardiovascular or endocrine event; or how activation of one neural brain structure exerts excitatory activity in another neural structure which then induces an inhibitory effect in some other system.[citation needed] Often, physiological psychologists examine the effects that they study in infrahuman subjects using surgical or invasive techniques and processes.[citation needed]