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Zh Vyssh Nerv Deiat Im I P Pavlova. 1994 Mar-Apr;44(2):239-43.

[Changes in the cardiac rhythm in response to acoustic stimuli in subjects with a seasonal affective disorder].

[Article in Russian]


Groups of depressed patients and normal controls were exposed to series of tones of low (75 dB) and high (105 dB) intensity. The initial component (averaged heart rate in 5 s post-stimulus interval) of cardiac reactions to the weak stimuli was decelerative. Depressed patients tended to have more decelerative reactions than controls. In depressed patients there was habituation across trial blocks. The first component of responses to the loud stimuli was predominantly accelerative in both groups. The later phase of the heart rate responses (averaged in the second 5 s post-stimulus interval) was predominantly accelerative in controls and decelerative in patients for both intensities. Characteristic features of orienting and defensive components of the cardiac reactions in winter depressions are discussed.

[Indexed for MEDLINE]

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