Kalmar "beta rhythm" tana nufin wani nau'in oscillation na jijiyoyi a cikin kwakwalwa wanda ke faruwa a mitar kusan 12-30 Hz (cycles per second). Sau da yawa ana lura da rhythms na beta a cikin ƙwayar motar kuma suna da alaƙa da aikin motsa jiki da shirin motsi. Hakanan za su iya kasancewa a wasu sassan kwakwalwa, irin su cortex na gani, kuma ana tunanin suna da hannu a cikin matakai kamar hankali da fahimta. Beta rhythms na ɗaya daga cikin nau'ikan raƙuman kwakwalwa daban-daban waɗanda za a iya auna su ta hanyar amfani da electroencephalography (EEG) ko wasu fasahohin neuroimaging.