How can one detect deception when a person is not prepared to lie in advance? In situations involving a sudden question \u2014 for instance, during cross-examination or an unexpected verification of an alibi \u2014 the liar\u2019s brain does not have time to construct a rational defense. The voice betrays us far more often than we think, especially at moments when we are least prepared for it. A spontaneous response to an unexpected question is a stress test for our honesty. Unlike rehearsed speech, spontaneous speech is virtually impossible to control consciously, and it is precisely at such moments that the prosodic markers of deception may manifest themselves.<\/p>\n\n\n\n
The key concept here is cognitive load<\/em>. When a person tells a lie in real time, their brain is forced simultaneously to suppress the truthful response and to construct a false narrative. This strain inevitably affects prosody \u2014 the intonational and rhythmic organization of an utterance.<\/p>\n\n\n\n According to research conducted by Russian psycholinguists, the first and most reliable acoustic indicator is the fundamental frequency<\/em> (F0). When producing a false statement, a statistically significant increase in F0 is observed compared with the same individual\u2019s neutral speech in a calm state. This phenomenon is explained by the activation of the sympathetic nervous system in response to stress. Experiments demonstrate that a liar\u2019s voice involuntarily becomes higher and more tense. Paradoxically, some individuals attempting to conceal deception conversely try to speak in an unnaturally low voice, which likewise constitutes a deviation from their habitual speech norm.<\/p>\n\n\n\n The second crucial marker of deception is the pausing structure of speech<\/em>. In situations involving an unexpected question, a lie often requires time for \u201cassembly,\u201d which leads to the appearance of latent pauses (prolonged silence before the response). However, fearing that they may give themselves away, liars may resort to filled hesitation pauses\u2014 meaningless filler sounds such as \u201cuh,\u201d \u201cum,\u201d which mask the time needed for reflection. An analysis of a 12-hour audio recording of authentic speech acts, conducted on Russian-language material, revealed an increase in the duration of such pauses preceding responses to provocative questions.<\/p>\n\n\n\n The prosody of deception is a complex set of features rather than a single universal signal. An increase in fundamental frequency, alterations in pausing structure (both an increase in the number of filled pauses and their unnatural absence), as well as changes in tempo and loudness, serve as objective indicators of the cognitive load and emotional tension that accompany the production of a false utterance in response to an unexpected question.<\/p>\n","protected":false},"excerpt":{"rendered":" How can one detect deception when a person is not prepared to lie in advance? In situations involving a sudden question \u2014 for instance, during cross-examination or an unexpected verification of an alibi \u2014 the liar\u2019s brain does not have time to construct a rational defense. The voice betrays us far more often than we […]<\/p>\n","protected":false},"author":13,"featured_media":81030,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[181],"tags":[],"class_list":["post-81028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"_links":{"self":[{"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/posts\/81028","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/comments?post=81028"}],"version-history":[{"count":1,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/posts\/81028\/revisions"}],"predecessor-version":[{"id":81040,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/posts\/81028\/revisions\/81040"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/media\/81030"}],"wp:attachment":[{"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/media?parent=81028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/categories?post=81028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/psychologydictionary.ae\/en\/wp-json\/wp\/v2\/tags?post=81028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}