Modifying Production Cylinder Heads (SPEED SPORT MOTOBOOKS) by Clive Trickey PDF

By Clive Trickey

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Behavioral Brain Research, 4,63-76. B. (1986). Lesions ofthe retrosplenial cortex produce deficits in reversal learning of the rabbit nictitating membrane response: Implications for potential interactions between hippocampal and cerebellar brain systems. Behavioral Neuroscience, 100, 802-809. V. (1985). Medial septal facilitation of hippocampal granule cell activity is mediated by inhibition of inhibitory interneurons. Brain Research, 361,99-106. F. (1996). Functional mapping of human learning: A positron emission tomography activation study of eyeblink conditioning.

Computer simulations with the attentional and attentionalconfiguralmodels demonstratethat, when latent inhibitionis impaired by hippocampal formation lesions, it is reinstated by haloperidol administration, simulated by decreasing the value of Novelty (see Table 5). Table 6. Simulated and experimental effects of the administration of dopaminergic agonists and antagonistson latent inhibitionunder differentexperimentalconditions(AfterSchmajuk,Buhusiand Gray, 1998). Reference Drug Condition Data/Model Killcross, Dickinson, Robbins (1994a) Amphetamine High US intensity Low US intensity Disrupts LI Preserves LI Ruob, Elsner, Weiner, and Feldon (1997) Amphetamine Low CS salience Disrupts LI Weiner, Tarrasch, Bemasconi, Brcesen, Amphetamine Low CS salience, low and high US Disrupts LI Ruttimann, and Feldon (1998) Amphetamine High CS salience, low and high US Preserves LI De la Casa, Ruiz, and Lubow (1993) Amphetamine Short CS duration Disrupts LI De la Casa, Ruiz, and Lubow (1993) Amphetamine Long CS duration Preserves LI Killcross, Dickinson, and Robbins (1994b) -flupenthixol Low US intensity Facilitates LI Ruob, Elsner, Weiner, and Feldon (1997) Haloperidol Low CS salience Facilitates LI Ruob, Weiner, and Feldon (1998) Haloperidol High US intensity Facilitates LI Ruob, Weiner, and Feldon (1998) Haloperidol Large number of conditioning trials Facilitates LI Administration of Cholinergic Agonists and Antagonists on Acquisition and Latent Inhibition In our computer simulations, muscarinic cholinergic antagonists (such as scopolamine) decrease and muscarinic cholinergic agonists (such as physostigmine) increase the value of the errror for the hidden units EHj.

In a serial feature-positive discrimination, animals learn to respond on serial presentations of the feature and target (CS1 CS2) reinforced trials, but not on target (CS,) nonreinforced trials. In this case, the feature acts as an occasion setter. According to the attentional-configural model, only normal animals and animals with lesions of the hippocampus proper exhibit serial feature-positive discrimination. These results are in agreement with Ross, Orr, Holland and Berger's (1984) data showing that acquisition of conditional discrimination is impaired in animals with lesions of the hippocampal formation, and with Jarrard and Davidson's (1991) observation that conditional discrimination is impaired in animals with lesions of the hippocampal formation but not in animals with lesions of the hippocampus proper.

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