ASSR

ASSR is an acronym that can refer to two distinct topics: Autonomous Soviet Socialist Republic, a historical type of territorial unit in the Soviet Union, and Auditory steady-state response, a neurophysiological measure used in audiology and neuroscience.

Autonomous Soviet Socialist Republics were semi-autonomous divisions within the Soviet Union, primarily within the Russian Soviet Federative Socialist Republic and, in some cases, within other union republics. They had their own local councils and a degree of cultural autonomy but remained subordinate to Moscow and to the republic's central authorities. During the USSR, several ASSRs existed, including the Tatar ASSR (now the Republic of Tatarstan), Bashkir ASSR (now Bashkortostan), Yakut ASSR (now the Sakha Republic), Chuvash ASSR (now the Chuvash Republic), Mari ASSR, Mordovian ASSR, Udmurt ASSR, and Komi ASSR, among others. In the late 1980s and early 1990s, many ASSRs were renamed as autonomous republics within the Russian Federation or gained separate status as independent states after the dissolution of the USSR in 1991.

Auditory steady-state response is an objective electrophysiological measure of hearing. It relies on presenting periodic auditory stimuli, such as amplitude-modulated tones, and recording the brain's electrical responses with electroencephalography (EEG). The response is phase-locked to the stimulus modulation and can be used to estimate auditory thresholds, especially in infants or individuals who cannot participate in behavioral hearing tests. It complements other auditory evoked potentials like otoacoustic emissions and the auditory brainstem response.

Because the same acronym is used in different domains, clarity depends on context.