Effect of disconnecting the orbital prefrontal cortex from the nucleus accumbens core on inter-temporal choice behaviour: a quantitative analysis.

Abstract:

:Previous experiments showed that destruction of the orbital prefrontal cortex (OPFC) or the nucleus accumbens core (AcbC) in rats altered choice between two delayed food reinforcers. Application of a quantitative model of inter-temporal choice suggested that lesions of either structure increased the delay-dependent degradation of reinforcer value (delay discounting); destruction of the OPFC (but not the AcbC) also increased the relative value of the larger reinforcer. This experiment examined the effect of disconnecting the OPFC from the AcbC on inter-temporal choice. Rats received excitotoxin-induced contralateral lesions of the OPFC and AcbC (disconnection), severing of the anterior corpus callosum (callosotomy), a combined lesion (disconnection+callosotomy) or sham lesions. They were trained in a discrete-trials progressive delay schedule to press levers A and B for a sucrose solution. Responses on A delivered 50 microl of the solution after a delay d(A); responses on B delivered 100 microl after a delay d(B). d(B) increased across blocks of trials; d(A) was manipulated across phases of the experiment. Indifference delay, d(B50) (value of d(B) corresponding to 50% choice of B), was estimated for each rat in each phase, and linear indifference functions (d(B50)vs. d(A)) were derived. The disconnection+callosotomy group showed a lower intercept of the indifference function (implying a higher rate of delay discounting) than the sham-lesioned group; the disconnection group showed a similar but less robust effect, whereas the callosotomy group did not differ significantly from the sham-lesioned group. The results suggest that OPFC-AcbC connections are involved in delay discounting of food reinforcers, but provide no evidence for an involvement of OPFC-AcbC connections in regulating sensitivity to reinforcer size.

journal_name

Behav Brain Res

authors

Bezzina G,Body S,Cheung TH,Hampson CL,Bradshaw CM,Szabadi E,Anderson IM,Deakin JF

doi

10.1016/j.bbr.2008.03.041

subject

Has Abstract

pub_date

2008-08-22 00:00:00

pages

272-9

issue

2

eissn

0166-4328

issn

1872-7549

pii

S0166-4328(08)00188-5

journal_volume

191

pub_type

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