Forward masking with frequency-following response analyses

Griz, Silvana Maria Sobral; Menezes, Denise Costa; Advíncula, Karina Paes; Lima, Maria Aline de Lucena; Menezes, Pedro de Lemos

doi:10.1590/1982-0216/20212321220

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ORIGINAL ARTICLES • Rev. CEFAC 23 (2) • 2021 • https://doi.org/10.1590/1982-0216/20212321220 copy

Forward masking with frequency-following response analyses

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Purpose:

to analyze forward masking in normally hearing young people, by using frequency-following responses.

Methods:

the synthetic syllable /da/ was used for the recordings of ten individuals, in the following conditions: /da/ with no masking, and /da/ after 4, 16, 32, and 64 milliseconds of masking. F-test (ANOVA) was applied for repeated measures with the Greenhouse-Geisser correction to compare testing conditions. For significant differences, multiple comparisons (between pairs of conditions) and Bonferroni correction were used. Data normality was verified by applying the Shapiro-Wilk test, and statistical significance was used at 5%.

Results:

wave latencies of all masking conditions were compared with those of no masking. A latency delay was observed in the transient region of the response (PV and A) in all masking conditions, except for 64 milliseconds. Latency delay also occurred for waves PW, PX, and PY, which corresponded to the sustained region of the response.

Conclusion:

forward masking was observed, by using frequency-following responses with /da/ syllable in four intervals (4, 16, 32, and 64 ms) of preceding masking. Forward masking was more evident in the transient region of the response than in the sustained one. This study highlights the importance of electrophysiological testing in temporal processing assessment.

Keywords:
Evoked Potentials; Speech; Noise

Wave	Test condition	Mean	SD	CV	Minimum	Maximum
PV	Unmasked	7.18^(A)	0.37	5.15	6.63	7.95
	4ms	8.28 ^(B)	0.51	6.16	7.10	9.07
	16ms	8.22 ^(B)	0.31	3.77	7.75	8.80
	32ms	8.13 ^(B)	0.31	3.81	7.75	8.75
	64ms	7.90 ^(B)	0.42	5.32	7.48	8.75
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54. = 0.001*
A	Unmasked	8.46 ^(A)	0.72	8.51	7.35	9.73
	4ms	9.72 ^(B)	0.53	5.45	9.15	10.65
	16ms	9.66 ^(B)	0.32	3.31	9.28	10.25
	32ms	9.44 ^(B)	0.72	7.63	8.55	10.80
	64ms	9.17 ^(AB)	0.51	5.56	8.35	9.88
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54.< 0.001*
PW	Unmasked	22.05 ^(A)	0.37	1.68	21.63	22.88
	4ms	22.50 ^(B)	0.48	2.13	21.95	23.60
	16ms	22.45 ^(B)	0.42	1.87	21.83	23.33
	32ms	22.41 ^(B)	0.48	2.14	21.83	23.53
	64ms	22.03 ^(AB)	0.73	3.31	20.30	23.15
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54. = 0.030*
PX	Unmasked	30.65 ^(A)	0.44	1.44	30.10	31.65
	4ms	31.30 ^(B)	0.38	1.21	30.68	32.13
	16ms	31.13 ^(B)	0.46	1.48	30.53	32.13
	32ms	31.25 ^(B)	0.47	1.50	30.53	32.25
	64ms	30.65 ^(AB)	1.23	4.01	27.70	31.80
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54. = 0.005*
PY	Unmasked	39.27 ^(A)	0.54	1.38	38.45	40.45
	4ms	39.92 ^(B)	0.46	1.15	39.40	41.10
	16ms	39.75 ^(B)	0.31	0.78	39.25	40.25
	32ms	39.83 ^(B)	0.41	1.03	39.33	40.78
	64ms	39.62 ^(AB)	0.56	1.41	38.75	40.65
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54.< 0.001*
PZ	Unmasked	47.89	0.52	1.09	47.28	49.10
	4ms	48.34	0.49	1.01	47.60	49.43
	16ms	48.19	0.57	1.18	47.70	49.48
	32ms	48.01	0.77	1.60	46.45	49.63
	64ms	48.18	0.53	1.10	47.65	49.43
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54. = 0.138
O	Unmasked	49.06 ^(A)	0.76	1.55	48.03	50.60
	4ms	49.59 ^(B)	0.58	1.17	48.88	50.88
	16ms	49.47 ^(AB)	0.58	1.17	48.77	50.48
	32ms	49.19 ^(AB)	0.80	1.63	47.77	50.68
	64ms	49.12 ^(A)	0.56	1.14	48.58	50.48
P-value	p ¹1. American Speech-Language-Hearing Association (ASHA). Central auditory processing: current status of research and implications for clinical practice. Am J Audiol. 1996;5(2):41-54. = 0.021*

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E-mail: revistacefac@cefac.br

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[1] Corresponding address: Silvana Maria Sobral Griz, Rua Abelardo Bastos, 119, Aldeia, CEP: 54783-030 - Camaragibe, Pernambuco, Brasil, E-mail: silvana.griz@hotmail.com