This dataset contains the experimental speech stimuli sets developed within the CIRCE project for perceptual experiments on accent perception and discrimination carried out in Portugal.The dataset includes audio files used in the CIRCE experiments, created by combining individual speech recordings from the CIRCE Portuguese Speech Stimuli Corpus and the CIRCE English Speech Stimuli Corpus into predefined sequences corresponding to specific experimental settings. Different stimulus sets reflect different ordering and grouping of the same underlying speech materials.The dataset documents the exact audio stimuli presented to participants in the CIRCE experiments to investigate students' attitueds towards L1 and L2 accents of Portuguese and English. The dataset is intended to support transparency, replicability, and methodological reuse in educational and social research contexts. It is part of the CIRCE Zenodo community. Important Notice on Access Conditions The audio files contain identifiable voice data and are therefore subject to data protection and ethical regulations. For this reason, access to the recordings is restricted. Access may be granted, upon request, exclusively for non-commercial scientific research purposes and in accordance with the informed consent provided by participants. Requests must specify the research objectives, institutional affiliation, and intended use of the materials, and are subject to approval by the designated data controllers. Redistribution of the recordings and the creation of derivative works are not permitted. All access procedures are conducted in compliance with applicable data protection legislation, including EU Regulation 2016/679 (GDPR). Requests for access and further information should be addressed to the Contact Person indicated.

The dataset was developed under the scientific coordination of Dr. Luis Guerra, who also fulfilled the roles of project manager and contact person. Data curation was performed by Claudia Soria. Overall project leadership was assumed by Silvia Calamai.