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The anxiolytic effect on the fear-potentiated startle is not due to a non-specific disruption
R J Joordens1, T H Hijzen, B Olivier
1Department of Psychopharmacology, Faculty of Pharmacy, Utrecht University, The Netherlands. R.J.E.Joordens@hetnet.nl
Abstract:
In the present study, the effects of alprazolam, chlordiazepoxide, ethanol and haloperidol in the strychnine-potentiated startle response paradigm were investigated. Because strychnine increases control startle levels without fear-conditioning, no central state of fear exists. When anxiolytic drugs reduce the fear-induced potentiation of the startle response without reducing the strychnine-induced startle potentiation, their attenuating effect on startle potentiation in the fear-potentiated startle response paradigm can more likely be attributed to their anxiolytic properties. The selected drugs, which effectively reduced the fear-induced startle potentiation in an earlier study, indeed did not selectively affect the strychnine-induced startle potentiation, supporting the notion that the dose-dependent reduction of startle potentiation due to anxiolytic drugs in the fear-potentiated startle response paradigm does not reflect a "non-specific" disruption of startle behavior.