Cue-Dependent Safety and Fear Learning in a Discriminative Auditory Fear Conditioning Paradigm in the Mouse

Autor/inn/en	Takemoto, Makoto; Song, Wen-Jie
Titel	Cue-Dependent Safety and Fear Learning in a Discriminative Auditory Fear Conditioning Paradigm in the Mouse
Quelle	In: Learning & Memory, 26 (2019) 8, S.284-290 (7 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1072-0502
DOI	10.1101/lm.049577.119
Schlagwörter	Animals; Safety; Cues; Fear; Auditory Stimuli; Behavior; Conditioning + Suchen Sie Ihr Suchwort? Animal; Tier; Tiere; Sicherheit; Stichwort; Furcht; Auditive Stimulation
Abstract	Discrimination between sensory stimuli associated with safety and threat is crucial for behavioral decisions. Discriminative conditioning paradigms with two acoustic conditioned stimuli (one paired with shock [CS+], the other unpaired with shock [CS-]) have been widely used as an experimental model for fear learning. However, no attention has been paid to the effect of the CS- on safety in the paradigms, because the CS- served as a neutral cue or elevated the freezing level due to fear generalization although less effectively than the CS+. By using a noise and a tone as two acoustic CSs in a discriminative auditory fear conditioning (AFC) paradigm, here we demonstrate that mice learn safety for the CS- while showing fear for the CS+ with opposing emotional behaviors. We found that after learning mice exhibited a significant suppression of context-dependent freezing during the CS-, but not during the CS+, indicating learned safety without fear generalization for the CS-. In contrast, the mice showed an enhanced level of freezing during the CS+ even in a novel spatial context, indicating cued fear for the CS+. Moreover, the CS+ also induced rapid defensive behaviors, whereas the CS- disinhibited normal exploratory behaviors. On the other hand, mice showed no significant suppression of contextual fear during the CS- in a paradigm with a pair of tone CSs at different frequencies, although they clearly discriminated the two tones. These results suggest our AFC paradigm with the noise and tone CSs as a useful experimental model for cue-dependent discriminative learning of safety and threat. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01