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Freezeview

Manufactured by Harvard Apparatus

FreezeView is a laboratory instrument designed for controlled freezing and imaging of samples. It allows for real-time observation of frozen samples during the freezing process.

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3 protocols using freezeview

1

Fear Conditioning in Rats: Tone Pre-exposure

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Female MAM- and saline-treated rats were placed into a 30.5 × 25.4 × 30.5 cm3 square conditioning chamber with metal walls and a stainless steel grid shock floor (Coulbourn Instruments, Whitehall, PA, USA). Rats were randomly assigned into two groups: tone pre-exposed and non-exposed. Pre-exposed rats were presented with a 20 second tone over 16 trials with a pseudo-random ITI averaging 2 minutes. Immediately following tone exposure, rats underwent an established fear conditioning procedure in which a 20 second tone co-terminated with a mild (0.8 mA, 0.5 sec) foot shock. The tone-shock pairing was presented 4 times with a pseudo-random ITI averaging 2 minutes. Twenty-four hours after conditioning, rats were returned to the conditioning chamber and re-exposed to the 20 second tone over 4 trials. Behavior was video recorded at each stage and freezing behavior was analyzed off-line using FreezeFrame and FreezeView software (Coulbourn Instruments). Freezing was defined as behavior below a motion index threshold of 10 lasting at least 1 second.
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2

Latent Inhibition Test for Schizophrenia

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The latent inhibition test was used to model a positive symptom of schizophrenia. Briefly, rats were placed into a 30.5×25.4×30.5 cm3 square conditioning chamber with metal walls and a stainless steel grid shock floor (Coulbourn Instruments) and randomly assigned to two groups: tone pre-exposed and non-exposed. Pre-exposed rats were presented with a 20 sec tone over 16 trials with a pseudorandom intertrial interval averaging 2 min. Immediately following tone exposure, rats underwent an established fear conditioning procedure in which the 20 sec tone co-terminated with a mild (0.8 mA, 0.5 sec) footshock. The tone-shock pairing was presented 4 times with a pseudorandom intertrial interval averaging 2 min. Twenty-four hours after conditioning, rats were returned to the conditioning chamber and re-exposed to the 20 sec tone over 4 trials. Behavior was video-recorded at each stage and freezing behavior was analyzed off-line using FreezeFrame and FreezeView software (Coulbourn Instruments). Freezing was defined as behavior below a motion index threshold of 10 lasting at least 1 sec. The percentage of latent inhibition was determined using the following formula: % LI = 100 − NoTone/Tone x 100.
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3

Latent Inhibition Test for Schizophrenia

Check if the same lab product or an alternative is used in the 5 most similar protocols
The latent inhibition test was used to model a positive symptom of schizophrenia. Briefly, rats were placed into a 30.5×25.4×30.5 cm3 square conditioning chamber with metal walls and a stainless steel grid shock floor (Coulbourn Instruments) and randomly assigned to two groups: tone pre-exposed and non-exposed. Pre-exposed rats were presented with a 20 sec tone over 16 trials with a pseudorandom intertrial interval averaging 2 min. Immediately following tone exposure, rats underwent an established fear conditioning procedure in which the 20 sec tone co-terminated with a mild (0.8 mA, 0.5 sec) footshock. The tone-shock pairing was presented 4 times with a pseudorandom intertrial interval averaging 2 min. Twenty-four hours after conditioning, rats were returned to the conditioning chamber and re-exposed to the 20 sec tone over 4 trials. Behavior was video-recorded at each stage and freezing behavior was analyzed off-line using FreezeFrame and FreezeView software (Coulbourn Instruments). Freezing was defined as behavior below a motion index threshold of 10 lasting at least 1 sec. The percentage of latent inhibition was determined using the following formula: % LI = 100 − NoTone/Tone x 100.
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