This study aimed to enhance classroom acoustics through the use of sound-absorbing panels and to examine their effects on speech intelligibility and cognitive performance. Two classrooms were selected to measure acoustic parameters, including reverberation time, equivalent sound pressure level, and speech transmission index. Students’ sustained attention and working memory were assessed using the SART and 2-BACK cognitive tests. Sound-absorbing panels were then manufactured and installed in one of the classrooms to evaluate their impact on speech intelligibility and cognitive performance. The results showed that in the intervention classroom, the reverberation time was reduced from 1.17 s to 0.74 s, and the equivalent sound pressure level decreased by 2 dB. Consequently, the speech transmission index improved by 10%. While the sound-absorbing panels did not significantly reduce the average percentage of errors and reaction times during the sustained attention test, improving the classroom’s acoustic conditions resulted in better performance on the working memory test.
SarwonoJTharrannisaSPutriR, et al. Improving the acoustics of university classroom using simulation approach. In: SiA, 2015.
2.
Castro-MartÃnezJAChavarría RoaJParra BenítezA, et al. Effects of classroom-acoustic change on the attention level of university students. Interdiscip2016; 33(2): 201–214.
3.
AguilarAJde la Hoz-TorresMLCostaN, et al. Indoor acoustic quality of educational buildings in South West Europe: influence of current ventilation strategies. J Build Eng2023; 80: 102021.
4.
RabeloATVSantosJNOliveiraRC, et al. Effect of classroom acoustics on the speech intelligibility of students. CoDAS2014; 26: 360–366.
5.
PengJLauS-KZhaoY.Comparative study of acoustical indices and speech perception of students in two primary school classrooms with an acoustical treatment. Appl Acoust2020; 164: 107297.
6.
KeshtkaranPNajafiN.Providing acoustic comfort in the classroom using double-glazed windows and its effect on students stress. Int J Sch Health2020; 7(3): 39–44.
7.
ČudinaMPrezeljJPušlar-čudinaM.The impact of paintings hung on lecture room walls on the speech intelligibility and perception of background noise. Indoor Built Environ2016; 25(4): 659–673.
8.
ZhangDTenpierikMBluyssenPM.Individual control as a new way to improve classroom acoustics: a simulation-based study. Appl Acoust2021; 179: 108066.
9.
RazaliAWChe DinNHamdanS.Investigation of the acoustics performance of the university’s lecture rooms by using economical and feasible design improvement strategies. J Des Built Environ2023; 23(3): 1–25.
10.
ChoiY-J.Evaluation of acoustical conditions for speech communication in active university classrooms. Appl Acoust2020; 159: 107089.
11.
YangD.A study of speech intelligibility and indoor environmental assessment in Hong Kong classrooms [Doctoral Dissertation]. Hong Kong: The Hong Kong Polytechnic University; 2021. https://theses.lib.polyu.edu.hk/handle/200/11007 (accessed 19 November 2023).
12.
JoA-HParkC-JHaanC-H.Investigation of the appropriate reverberation time for lower-grade elementary school classrooms using speech intelligibility tests. Buildings2022; 12(6): 808.
13.
American National Standards Institute; Acoustical Society of America. ANSIASo. ANSI/ASA S12.60-2010/Part 1: American national standard acoustical performance criteria, design requirements, and guidelines for schools, Part 1: Permanent Schools. Melville, NY: Acoustical Society of America; 2010.
14.
ChoiY-J.Acoustical measurements of masks and the effects on the speech intelligibility in university classrooms. Appl Acoust2021; 180: 109149.
15.
van den HeuijKGovertsTNeijenhuisK, et al. Challenging listening environments in higher education: an analysis of academic classroom acoustics. J Appl Res High Educ2021; 13(4): 1213–1226.
16.
LiLLiuYLiL.The effects of noise and reverberation time on auditory sustained attention. Appl Sci2023; 13(14): 8256.
17.
ForouharmajdFPourabdianSAhmadiN, et al. Evaluation of cognitive function after exposure to different levels of sound pressure levels in the clinical trial study. Is 65 dB level safe?Stud -med Sci2017; 27(11): 967–975.
18.
GolmohammadiRDarvishiEFaradmalJ, et al. Attention and short-term memory during occupational noise exposure considering task difficulty. Appl Acoust2020; 158: 107065.
19.
MonteiroRToméDNevesP, et al. The interactive effect of occupational noise on attention and short-term memory: a pilot study. Noise Health2018; 20(96): 190–198.
20.
JianxinPJiangP.The effects of the noise and reverberation on the working memory span of children. Arch Acoust2017; 43(1): 123–128.
21.
KlatteMLachmannTMeisM (eds). Effects of noise and reverberation on verbal short-term memory in young adults in a classroom-like setting. In: The 9th biennial conference on environmental psychology, Eindhoven, http://proceedingsenvpsych2011eu/files/oralshtml (2011, accessed 6 January 2024).
22.
LjungRKjellbergA.Long reverberation time decreases recall of spoken information. Build Acoust2009; 16(4): 301–311.
23.
KristiansenJLundSPPerssonR, et al. A study of classroom acoustics and school teachers’ noise exposure, voice load and speaking time during teaching, and the effects on vocal and mental fatigue development. Int Arch Occup Environ Health2014; 87: 851–860.
24.
MatinAMAlefiMMonazzamMR, et al. Study of noise loudness and sharpness effects on cognitive performance on male students of Tehran University of Medical Sciences. J Heal Saf Work2022; 12(1): 67–81.
25.
HemmatjoRRostamiRHajaghazadehM, et al. Investigation of the effects of high-and low-frequency noise on physiological responses and cognitive functions in the oil and gas industry: a field study. J Occup Hyg Eng2021; 8(3): 27–39.
26.
ISO 3382-2:2008 Acoustics: Measurement of room acoustic parameters.
27.
AguilarJRTilanoLM.Measurement of classroom acoustic parameters in the public schools of Medellin. Int J Acoust Vib2019; 24(1): 50–55.
28.
LecceseFRoccaMSalvadoriG.Fast estimation of speech transmission index using the reverberation time: comparison between predictive equations for educational rooms of different sizes. Appl Acoust2018; 140: 143–149.
29.
RobertsonIHManlyTAndradeJ, et al. Oops!’: performance correlates of everyday attentional failures in traumatic brain injured and normal subjects. Neuropsychologia1997; 35(6): 747–758.
KaneMJConwayARAMiuraTK, et al. Working memory, attention control, and the N-back task: a question of construct validity. J Exp Psychol Learn Mem Cogn2007; 33(3): 615–622.
NowoświatAOlechowskaM.Investigation studies on the application of reverberation time. Arch Acoust2015; 41(1): 15–26.
35.
CuchareroJHänninenTLokkiT.Influence of sound-absorbing material placement on room acoustical parameters. Acoustics2019: 1: 644–660.
36.
CiaburroGIannaceG.Acoustic characterization of rooms using reverberation time estimation based on supervised learning algorithm. Appl Sci2021; 11(4): 1661.
37.
Mogas-RecaldeJPalauRMárquezM.How classroom acoustics influence students and teachers: a systematic literature review. J Technol Sci Educ2021; 11(2): 245–259.
38.
AliabadiMMahdaviNFarhadianM, et al. Evaluation of noise pollution and acoustic comfort in the classrooms of Hamadan University of medical sciences in 2012. Iran J Ergon2013; 1(2): 19–27.
39.
OrtizALPOrduña-BustamanteF. Improving speech intelligibility for binaural voice transmission under disturbing noise and reverberation using virtual speaker lateralization. J Appl Res Technol2015; 13(3): 351–358.
40.
ŞaherKBulunuzMKelmendiJ, et al. Assessment of speech intelligibility during different teaching activities in classrooms with and without acoustic treatment. Appl Acoust2023; 207: 109346.
41.
AlexandraECatalinaT.Improving speech intelligibility in a high school classroom using sound absorbing panels. Rom J Acoust Vib2021; 18(1): 40–45.
42.
KjellbergA.Effects of reverberation time on the cognitive load in speech communication: theoretical considerations. Noise Health2004; 7(25): 11–21.
43.
VettoriGDi LeonardoLSecchiS, et al. Primary school children’s verbal working memory performances in classrooms with different acoustic conditions. Cogn Dev2022; 64: 572.
44.
MealingsK.Classroom acoustics and cognition: a review of the effects of noise and reverberation on primary school children’s attention and memory. Build Acoust2022; 29(3): 401–431.
45.
JafariMJKhosrowabadiRKhodakarimS, et al. The effect of noise exposure on cognitive performance and brain activity patterns. Open Access Maced J Med Sci2019; 7(17): 2924–2931.
