Intensity and Trial Effects for Simple Auditory Stimuli in a Dishabituation Paradigm
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1
university of wollongong, Australia
Aim
We examined the influence of novelty and intensity in the rarely used auditory dishabituation paradigm. Stimulus-response (S-R) patterns were examined for autonomic and central measures and quantitatively compared to the phasic skin conductance response (SCR) –the OR benchmark. Differing patterns consistent with Preliminary Process Theory (PPT) were sought.
Method
Sixteen undergraduates experienced twelve 1000 Hz tones (60/80 dB, 50 ms with 15 ms rise/fall times) presented with random ISIs (45 to 70 s), and no task requirements. Subjects were counterbalanced according to the starting tone intensity. The first 10 standard trials were of one intensity, followed by a change trial at the other intensity (recovery), and a subsequent dishabituation trial at the initial tone. The SCR, Evoked Cardiac Response(ECR), Respiratory Pause (RP), Peripheral Vasoconstriction (PVC), and single-trial ERPs from 19 sites, were collected. EOG-corrected ERP data were submitted to a temporal Principle Components Analysis (PCA). Novelty was assessed via trial decrement, and intensity via the group × trials interaction at recovery.
Results
SCR displayed decrement, recovery (trials and group × trials), and dishabituation. Three S-R patterns emerged based on the SCR S-R pattern, correlation analysis, and temporal PCA groupings. Pattern 1 (novelty and intensity insensitivity): HR, P1, PN, and P2. Pattern 2 (no decrement but intensity sensitivity): PVC, Na, N1-1, and P3a. Pattern 3 (novelty and intensity sensitivity): SCR, RP, P3b, HabP3, IntP3, and SW.
Conclusions
The S-R patterns of the autonomic measures were generally consistent with previous findings. Each pattern contained both autonomic and ERP measures. Various ERP components failed to differ from the hallmark S-R pattern of the OR. Fractionation of responses was found for both autonomic and central measures, and their patterns were consistent with PPT.
References
Barry, R. J. (1984). Preliminary Processes in O-R Elicitation. Acta Psychol., 55, 109-142.
Barry, R. J. (1996). Preliminary process theory: Towards an integrated account of the psychophysiology of cognitive processes. Acta Neurobiol. Exp. (War), 56, 469-484.
Sokolov, E. N. (1963). Perception and the conditioned reflex. Pergamon, Oxford.
Keywords:
orienting reflex,
Preliminary process theory,
dishabituation,
Principle components analysis,
Intensity
Conference:
ASP2015 - 25th Annual Conference of the Australasian Society for Psychophysiology, Sydney, Australia, 2 Dec - 4 Dec, 2015.
Presentation Type:
Poster Presentation
Topic:
Psychophysiology
Citation:
Macdonald
B and
Barry
RJ
(2015). Intensity and Trial Effects for Simple Auditory Stimuli in a Dishabituation Paradigm.
Conference Abstract:
ASP2015 - 25th Annual Conference of the Australasian Society for Psychophysiology.
doi: 10.3389/conf.fnhum.2015.219.00034
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Received:
22 Oct 2015;
Published Online:
30 Nov 2015.
*
Correspondence:
Mr. Brett Macdonald, university of wollongong, wollongong, Australia, brettell08@yahoo.com