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Volume 17, Number 10, Issue of May 15, 1997 pp. 3840-3846
Copyright ©1997 Society for Neuroscience

Behavioral and Neurochemical Recovery from Partial 6-Hydroxydopamine Lesions of the Substantia Nigra Is Blocked by Daily Treatment with D1/D5, But Not D2, Dopamine Receptor Antagonists

Adriana Emmi, Heshmat Rajabi, and Jane Stewart

Center for Studies in Behavioral Neurobiology, Department of Psychology, Concordia University, Montreal, Quebec, Canada H3G 1M8

ABSTRACT
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
FOOTNOTES
REFERENCES

ABSTRACT

To determine whether D1/D5 dopamine (DA) receptors play a role in normalization of DA extracellular levels of striatal DA and behavioral recovery after partial 6-OHDA lesions of the substantia nigra, animals were treated on days 1-8 after lesioning with the D1/D5 DA receptor antagonists SCH 23390 (0.1 mg/kg, s.c.) and SCH 39166 (1.0 mg/kg, s.c.), the inactive enantiomer SCH 23388 (0.1 mg/kg, s.c.), the D2 antagonist eticlopride (0.1 mg/kg, i.p.), or saline. Spontaneous turning behavior was assessed on days 3 and 15. Basal extracellular DA and metabolites were measured in both striata using microdialysis on days 16 and 17, 8-9 d after termination of drug treatments. On day 3, all animals turned ipsilateral to the lesion. On day 15, animals previously treated with either saline, eticlopride, or SCH 23388 showed no behavioral asymmetries, whereas animals treated with SCH 23390 or SCH 39166 turned ipsilaterally. On days 16 and 17, extracellular DA did not differ on the two sides in animals treated with saline or eticlopride and were higher on the lesioned side after SCH 23388. In animals treated with the D1/D5 receptor antagonists, however, basal levels of DA were lower on the lesioned side, showing no evidence of normalization. These results suggest a role for the D1/D5 DA receptor in the development of compensatory changes in the DA neurons that accompany behavioral recovery from partial lesions of nigrostriatal DA system.

Key words: substantia nigra; 6-OHDA lesions; behavioral recovery; striatal dopamine; microdialysis; D1/D5 receptor antagonists; D2 receptor antagonists

INTRODUCTION

Behavioral recovery after partial unilateral lesions of the nigrostriatal pathway is accompanied by gradual normalization of extracellular dopamine (DA) in the striatum measured using microdialysis (Robinson and Whishaw, 1988; Zhang et al., 1988; Abercrombie et al., 1990; Castañeda et al., 1990; Robinson et al., 1994). We showed recently that daily injections of NMDA receptor antagonists given in the first week after such lesions block behavioral recovery and normalization of extracellular DA in striatum measured 1 week after the last drug injections using microdialysis (Emmi et al., 1996). We argued on the basis of our findings that glutamate acts immediately after a lesion, in a period with high potential for neural plasticity, to bring about enduring changes in functioning of the DA neurons that remain after partial lesions. These findings led us to compare the compensatory changes that seem to occur in the remaining DA neurons with the changes responsible for sensitization within the midbrain DA system that occurs after repeated injections of amphetamine. Several days to weeks after termination of amphetamine treatments (Kolta et al., 1985; Kalivas and Duffy, 1993; Paulson and Robinson, 1995), there is increased dopaminergic activity in striatal regions: higher basal levels of DA metabolites, and higher extracellular DA levels in response to amphetamine challenge (Robinson et al., 1988; Akimoto et al., 1990; Patrick et al., 1991; Vezina, 1993). These long-lasting neuronal changes that accompany behavioral sensitization of the effects of amphetamine suggest a permanent reorganization within the system. It was of interest that, as is the case for recovery from partial lesions of the substantia nigra (SN), the development of sensitization to amphetamine is blocked by NMDA receptor antagonists (Karler et al., 1989, 1990; Wolf and Khansa, 1991; Stewart and Druhan, 1993; Wolf and Jeziorski, 1993; Wolf et al., 1994).

The development of sensitization to amphetamine as expressed behaviorally and by increased extracellular DA levels in the ventral striatum in response to amphetamine is also blocked by antagonists of the D1/D5 DA receptor (Vezina and Stewart, 1989; Drew and Glick, 1990; Vezina, 1996). Furthermore, blockade of D1/D5 receptors in the ventral tegmental area (VTA)-SN region, where the events that lead to amphetamine-induced sensitization of DA functioning are initiated (Kalivas and Weber, 1988; Vezina and Stewart, 1990; Vezina, 1993; Cador et al., 1995), is sufficient to produce this effect (Stewart and Vezina, 1989; Bjijou et al., 1996). D1/D5 receptors in the VTA and SN reticulata are located on terminals of afferents to these regions arising from the cortex (Dewar et al., 1996) and striatum (Altar and Hanser, 1987; Richfield et al., 1987; Mansour et al., 1992). Stimulation of D1/D5 receptors in the VTA and SN increases the local release of glutamate (Kalivas and Duffy, 1995) and GABA (Floran et al., 1990; Cameron and Williams, 1993). We speculated, therefore, that DA activity at D1/D5 receptors might also contribute to changes in the nigrostriatal DA system that occur in the period immediately after lesioning. To test this idea, animals were treated daily with D1 or D2 receptor antagonists or saline for 8 d after partial unilateral 6-OHDA SN lesions. Behavioral recovery and normalization of basal DA levels in the striatum were assessed 8 d after the last injections.

MATERIALS AND METHODS

Subjects Subjects were male Wistar rats weighing 350-380 gm at the beginning of the experiment. The rats were housed individually in plastic shoe box cages with tap water and standard rat chow available ad libitum. The light/dark cycle was reversed (lights off between 8:00 A.M. and 8:00 P.M.), and testing was conducted during the dark phase of the cycle (from 8:00 A.M.).

Drugs 6-OHDA, SCH 23390 [R(+)-7-chloro-8-hydroxy-3-methyl-l-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine HCl], SCH 23388 [R(-)-7-chloro-8-hydroxy-3-methyl-l-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine HCl, the inactive enantiomer], and eticlopride [S(-)-chloro-5-ethyl-N-[(1-ethyl-2-pyrrolidinyl)methyl]-6-hydroxy-2 methoxy-benzamide HCl] were obtained from RBI Biochemicals; SCH 39166 [(-)-trans-6,7,7a,8,9,13b-hexahydro-3-chloro - 2 - hydroxy - N - methyl-5H-benzo-[d]naphtho[2 ,1b] azepine] was from Schering-Plough Research Institute; and desmethylimipramine and pargyline were from ICN Pharmaceuticals Canada, Ltd.

Surgery Animals were injected with desmethylimipramine (15 mg/kg, i.p., in 1.0 ml/kg saline) 30 min before lesioning. They were anesthetized with sodium pentobarbital (30 mg/kg, i.p.) and given injections of atropine sulfate (0.5 mg/ml, 0.1 ml/rat, s.c.) and pargyline (40 mg/kg, s.c., in 1.0 ml/kg saline). Using a stereotaxic instrument set to obtain a flat skull, 6-OHDA (8 µg/4 µl of saline) was injected unilaterally into the substantia nigra (anterior-posterior, -5.4; lateral, 2.0; dorsal-ventral, -9.3 from the skull surface) using a Hamilton microsyringe; the injector was removed 5 min after the end of the infusion. These injection parameters yield lesions that are estimated to range from 56 to 90% of the nonlesioned side as measured by tissue levels of DA in the striatum (Emmi et al., 1996).

With the stereotaxic arms angled at 10° from the vertical plane, 22 gauge stainless steel guide cannulae, for the later insertion of the dialysis probes, were implanted bilaterally into the striatum using the skull surface coordinates of anterior-posterior, +1.2; lateral, 3.0; and dorsal-ventral, -3.4. The cannulae were anchored to the skull with stainless steel screws and secured to the surface with dental cement. All animals were injected with penicillin G (300,000 IU, 0.2 ml/rat) after surgery. At the end of the study, animals were killed by decapitation, and the brains were removed, frozen, and sliced. The slices were immediately examined, and the location of the track formed by the probes was determined. Placements were within the striatum in all cases. Only one animal was eliminated from the results on the basis of an infected region around the cannulae.

Behavioral tests To increase the probability of sustained behavioral activation without having to treat animals with a stimulant drug, one set of tests was conducted in the home cage at the beginning of the dark cycle when animals are active, and another set was conducted after animals were moved to a novel environment.

Locomotion and turning in home cage. Locomotor activity was measured for 10 min at the start of the dark phase of the cycle (8:00 A.M.) in the plastic shoe box home cages. A video camera and a videocassette recorder were used to record the behavior. Tapes were scored for the number of 360° turns ipsilateral or contralateral to the lesion in 10 min. The time spent drinking with one or the other side of the face toward the drinking tube was noted.

Water was available ad libitum, whereas access to food was interrupted during the observation.

Turning and wall facing in the novel environment. After the home cage observation, the behavior was monitored in a novel environment using a video image-analyzing system (Chromotrack System, Poly-track model; San Diego Instruments). Four boxes (58 × 58 × 48 cm) built of wood, painted flat black, and open at the top were used. The video camera was connected to a computer located in a separate room. Using a combination of the software program provided and a record of the video image, behavior was scored for the number of 360° turns ipsilateral and contralateral to the lesion, and for the total time during which the vibrissae or the body of the moving animal was in contact with the wall of the open field (wall facing) (Steiner et al., 1988). Recording started 10 sec after the rat was placed in the center of the field and lasted 5 min.

Microdialysis Microdialysis was conducted in four hexagonal testing chambers (42 × 39 × 33.5 cm) built from Plexiglas with wooden ceilings and stainless steel rod floors. Dark curtains were drawn around each chamber, and lighting was provided on a reversed cycle by overhead light bulbs (15 W). The dialysis probe consisted of a 3.5 mm length of semipermeable dialysis membrane (Spectra/Por; 240 µm outer diameter, 13,000 molecular weight cutoff), closed at one end and attached at the other to a 19 mm length of 26 gauge stainless steel tubing. A 40-50 cm length of PE-20 tubing connected the other end of the stainless steel shaft to an infusion swivel stationed above the testing chamber that was in turn connected via PE-20 tubing to a variable speed infusion pump. A small diameter, fused silica tube extended internally through the probe, with one end resting 0.5 mm from the tip of the probe and the other end exiting the PE tubing 35 cm below the infusion swivel. The animals were held and gently rocked before insertion of the probes, which were then secured in place by brass collars that screwed onto the guide cannulae, and the external length of PE-20 tubing was protected from damage by steel spring casings. The probes were designed so that the entire length of semipermeable membrane extended below the guide cannula tip.

The probes were inserted the day before the beginning of microdialysis testing. To prevent occlusion, artificial CSF (145 mM Na+, 2.7 mM K+, 1.22 mM Ca2+, 1.0 mM Mg2+, 150 mM Cl-, 0.2 mM ascorbate, and 2 mM Na2HPO4, pH 7.4 ± 0.1) was perfused overnight at a rate of 0.06 µl/min.

Dialysate sampling and activity monitoring began the next morning. Half of the animals from each treatment condition were dialyzed on the lesioned side on the first day of dialysis and on the intact side on the second day of dialysis; for the other animals the conditions were reversed. The dialysate flow rate was increased to 0.6 µl/min, and baseline dialysate samples (~12 µl/sample) were collected every 20 min. A 10 µl volume of dialysate was extracted from each sample and immediately analyzed using one of two similar HPLC systems with electrochemical detection (HPLC-EC). The samples were loaded onto reverse-phase columns (15 × 0.46 cm; Spherisorb-ODS2, 5 µm; Chromatography Sciences) through manual injection ports (Reodyn 7125; 20 µl loop); reduction and oxidation currents for DA and its metabolites dihydrophenylacetic acid (DOPAC) and homovanillic acid (HVA) were measured with dual channel ESA coulometric detectors (Coulochem 5100, with a model 5021 conditioning cell and a model 5011 analytical cell; Scientific Products & Equipment, Concord, Ontario, Canada). The currents for DA were measured independent of those for DOPAC and HVA using separate channels of the Coulochem detectors. The mobile phases (25% methanol, 0.076 M SDS, 0.1 M EDTA, 0.058 M NaPO4, and 0.27 M citric acid, pH 4.0) were circulated through each closed system at a flow rate of 1.0 ml/min by Waters 510 HPLC pumps. The peaks obtained for DA, DOPAC, and HVA were integrated and quantified by an EZChrom chromatography data system (Scientific Products & Equipment). Dialysate samples from individual rats always were analyzed with the same HPLC-EC system, and the assignment of animals to each system was counterbalanced across all treatment groups. Food was removed from the chambers before sampling, but a water drinking tube was available.

Design and procedures

Figure 1 outlines the timing of the treatments and experimental manipulations. To determine whether D1/D5 or D2 DA receptors played a role in the recovery from partial 6-OHDA lesions of the SN, animals were treated with the D1/D5 DA receptor antagonists SCH 23390 or SCH 39166 or with the inactive enantimer SCH 23388, with the D2 receptor antagonist, eticlopride, or with saline for the first 8 d after the lesion (days 1-8). Injections of either 0.1 mg/kg SCH 23390, s.c. (n = 9), and 0.1 mg/kg SCH 23388, s.c. (n = 9), chosen on the basis of previous behavioral studies (Vezina, 1996); 1.0 mg/kg s.c. of the highly selective D1/5 receptor antagonist SCH 39166 (n = 5), dose chosen on the basis of previous binding analyses and behavioral studies (McQuade et al., 1991); 0.1 mg/kg eticlopride, i.p. (n = 12), chosen on the basis of its ability to suppress behavioral activation (Hoffman and Donovan, 1994; Jeziorski and White, 1995); or saline, i.p. (n = 6), were given daily at 10:00 A.M. On days 3 and 15, behavioral observations were made in both environments before the drug treatments beginning around 8:00 A.M. No injections were given on days 9-15. The animals were moved to the microdialysis chambers after testing on day 15. The probes were inserted and were perfused overnight at a rate of <0.06 ml/min. Dialysate sampling began on the morning of day 16 when one-half of the animals from each treatment condition were dialyzed on either the lesioned or the intact side. Several samples were taken and analyzed to determine that the baseline was settled (usually five or six samples at 20 min intervals) before the final eight samples were taken for statistical analysis. That evening, a probe was inserted into the other striatum, and on day 17 dialysate sampling began in the morning after similar procedures.
Fig. 1. Outline of timing of treatments and experimental manipulations.
[View Larger Version of this Image (9K GIF file)]

Statistical analyses

The data from all animals (with the exception mentioned in Surgery) were included in the analyses. The data from microdialysis, performed on both sides of the brain in all animals, were subjected to two-way ANOVAs for "treatment group" as the between factor and "side" as the within factor. Tests for simple main effects were used to determine the sources of the significant Treatment Group × Side interactions. The data from the behavioral tests were analyzed by three-way ANOVAs for treatment group as the between factor and side and "time" as within factors. Tests for simple main effects were used to determine the sources of the significant Treatment Group × Side interactions at each Time.

RESULTS

In vivo microdialysis

Dopamine Basal levels of DA from the intact and lesioned striata of animals treated from days 1 to 8 with SCH 23390, SCH 23388, SCH 39166, eticlopride, or saline and then tested using microdialysis on days 16 and 17 (8 and 9 d after termination of drug injections) are shown in Figure 2A. It can be seen that animals treated with the saline or with the D2 DA antagonist showed normalization of basal dopamine levels on the lesioned side. On the other hand, animals treated previously with the D1/D5 DA receptor antagonists, SCH 23390 or SCH 39166, had significantly lower basal levels of DA in the striatum on the lesioned side than on the intact side. Animals treated with SCH 23388, the inactive enantiomer of SCH 23390, showed higher basal levels of DA in the striatum on the lesioned side than on the nonlesioned side. These effects are reflected in a significant Treatment Group × Side interaction.
Fig. 2. Microdialysis. Mean ± SEM basal levels of DA (A), DOPAC (B), and HVA (C) in pg/10 µl of eight dialysate samples taken at 20 min intervals on the lesioned and intact side of the striatum on days 16 and 17 after surgery in animals with unilateral 6-OHDA lesions in substantia nigra. Treatment groups were given injections of an antagonist or saline daily on days 1-8 after surgery. ANOVAs (Treatment × Side) yielded the following significant effects: DA, Treatment × Side interaction [F(4,36) = 5.75, p < 0.001]; DOPAC, side [F(1,36) = 57.22, p < 0.0001]; and HVA, side [F(1,36) = 23.17, p < 0.0001]. *, p < 0.05; **, p < 0.01; ***, p < 0.001 (significance of differences between lesioned and nonlesioned sides as assessed by analyses for simple main effects in treatment group).
[View Larger Version of this Image (55K GIF file)]

DOPAC and HVA Basal levels of both DOPAC and HVA taken on days 16 and 17 are shown in Figure 2, B and C, respectively. The ANOVA showed that there was a significant effect of side, but no Treatment Group × Side interaction. It can be seen that levels of both metabolites were significantly lower on the lesioned side in all groups, indicating that all groups sustained lesions of similar magnitude (Robinson and Whishaw, 1988; Castañeda et al., 1990). See legend of Figure 2 for results of statistical analyses.

Behavior

Home cage Figure 3A shows that on day 3 all animals in all groups made a greater number of 360° turns toward the lesioned side (Fig. 3A, Ipsi). By day 15, although all animals displayed an increase in the total number of turns, animals previously treated with SCH 23388, eticlopride, or saline turned equally in both directions. SCH 23390- and SCH 39166-treated animals, however, continued to turn preferentially toward the lesioned side. These findings are reflected in the significant interaction between Treatment Group × Side × Time.
Fig. 3. Behavior. Mean ± SEM number of turns toward the side of the lesion (Ipsi) or away from the lesion (Contra) in tests made on days 3 and 15 after surgery in the home cage (A) and in a new environment (B). C, Mean ± SEM time the vibrissae or the body of the moving animal was in contact with the wall in the new environment. Treatment groups were given injections of an antagonist or saline daily on days 1-8 after surgery. ANOVAs (treatment group × side × time): In each of the analyses (A, home cage; B, new environment; and C, wall facing), the main effects of Treatment Group, Side, and Time and all of the interactions were significant (p = 0.0001). dagger , p < 0.0001 (significance of differences between number of ipsilateral and contralateral turns as assessed by analyses for simple main effects in each treatment group at each time point).
[View Larger Version of this Image (57K GIF file)]

New environment Similar results were found for turning in the novel environment. It can been seen in Figure 3B that on day 3 animals in all treatment groups turned predominantly toward the lesion side. By day 15, saline-, SCH 23388-, and eticlopride-treated animals showed no preferential turning, whereas animals previously treated with the D1/D5 DA receptor antagonists SCH 23390 and SCH 39166 continued to turn more frequently toward the lesioned side. Figure 3C shows the amount of time the vibrissae or the body of the moving animal was in contact with the wall of the open field. On day 3, regardless of treatment condition, animals spent more time with the lesioned side toward the wall. By day 15, saline-, SCH 23388-, and eticlopride-treated animals did not show preference for either side, whereas the SCH 23390- and SCH 39166-treated animals continued to keep the lesioned side toward the wall. These effects are reflected in a significant Treatment Group × Side × Time interaction. See legend of Figure 3 for results of statistical analyses.

DISCUSSION

The purpose of these experiments was to determine whether activity at D1/D5 DA receptors plays a role in the changes that lead to the recovery of behavioral function and normalization of striatal basal levels of DA after partial lesion of DA neurons in the substantia nigra. We found that daily injections of the D1/D5 receptor antagonists SCH 23390 and SCH 39166, given for 8 d after partial 6-OHDA lesions of the nigrostriatal neurons, blocked the behavioral recovery and resulted in low basal levels of striatal DA on the lesioned side of the brain. Neither the D2 DA receptor antagonist nor the inactive enantiomer of the D1/D5 antagonist SCH 23388 interfered with these measures of recovery. These effects were seen 16 d after the lesions, 8 d after the termination of drug treatments. Thus, it seems likely that action at D1/D5 receptors in the period immediately after a lesion, when the potential for plastic changes is high, can bring about enduring changes in functioning of the DA neurons that remain after partial lesions. Inexplicably, in the case of the group treated with the inactive enantiomer SCH 23388, basal levels of striatal DA on the lesioned side actually exceeded those seen on the nonlesioned side, despite the fact that the levels of DOPAC and HVA clearly indicated the presence of lesions comparable with those seen in the other groups. This effect of SCH 23388 was seen in seven of nine of the animals tested (two showed normalization of levels on the lesioned side) and is, therefore, unlikely the result of an experimental artifact. We can only suggest that this compound has partial agonist activity or, more probably, actions at as yet unidentified receptors.

As mentioned in the introductory remarks, these experiments were prompted by the similarities between the compensatory changes in DA neurons after partial lesions and the development of long-term changes in DA neurons after repeated exposure to amphetamine. As in the case of sensitization (Karler et al., 1989, 1990; Wolf and Khansa, 1991; Stewart and Druhan, 1993; Wolf and Jeziorski, 1993; Wolf et al., 1994), NMDA receptor antagonists are able to interfere with recovery from partial lesions (Emmi et al., 1996). D1/D5 DA receptor antagonists also interfere with the development of sensitization when given before each injection of amphetamine (Vezina and Stewart, 1989; Drew and Glick, 1990; Vezina, 1996), and there is one report that the antagonist interferes with the development of sensitization when given after each injection of amphetamine (Kuribara, 1995). Now we show that these compounds can prevent behavioral recovery and normalization of basal levels of DA in the striatum.

The present studies do not allow us to specify where in the system these antagonists are acting to prevent recovery from the lesions. It is known, for example, that after 6-OHDA lesions there are long lasting changes in sensitivity to the behavioral effects of D1/D5 agonists (Criswell et al., 1989; Criswell et al., 1990). In the case of sensitization to amphetamine there are long lasting increases in the responsiveness of D1 receptors on cells in the ventral striatum as measured electrophysiologically in anesthetized animals (Henry and White, 1991). We know as well, however, from our studies on sensitization, that blockade of D1/D5 receptors in the VTA-SN region is sufficient to prevent sensitization to the behavioral effects of amphetamine (Stewart and Vezina, 1989; Bjijou et al., 1996). D1/D5 receptors found in the VTA and SN reticulata are located on terminals of afferents to these regions arising from the cortex (Dewar et al., 1996) and striatum (Altar and Hanser, 1987; Richfield et al., 1987; Mansour et al., 1992). Stimulation of D1/D5 receptors in the VTA and SN have been shown to increase the local release of glutamate (Kalivas and Duffy, 1995) and GABA (Floran et al., 1990; Cameron and Williams, 1993). Furthermore, locally applied D1/D5 receptor agonists and DA released from dendrites have behavioral effects and can modulate the firing of pars compacta neurons (Waszczak and Walters, 1986; Martin and Waszczak, 1994; Timmerman and Abercrombie, 1996). It is of interest that 6-OHDA-lesioned animals seem supersensitive to these effects of DA in the SN (Waszczak and Walters, 1984), and it has been suggested (see Robertson, 1992) that L-DOPA converted to DA may act on D1/D5 receptors in the SN to bring about behavioral changes in the 6-OHDA unilateral lesion model of Parkinson's disease.

Finally, the question arises, if both glutamate acting at NMDA receptors and DA acting at D1/D5 DA receptors are involved in long-term compensatory changes in DA neurons that accompany recovery from partial lesions and the development of sensitization after repeated exposure to amphetamine and other stimulant drugs, what is the basis of the interaction between these two systems, and where does the interaction take place? We hypothesized in the case of glutamate that it could act via NMDA receptor activation to stimulate release of DA from dendrites, thereby increasing extracellular DA in the somatodendritic region of the DA neurons. As discussed above, DA acting at D1/D5 receptors in the region can facilitate the release of glutamate, but there is also evidence that DA acting at D1/D5 receptors may enhance NMDA channel function directly (Levine et al., 1996), suggesting another mode of potential interaction between the two systems. It is of interest that there have been recent reports of D1/D5 DA and NMDA receptor interactions in long-lasting neuronal changes involved in long-term potentiation (Huang and Kandel, 1995; Otmakhova and Lisman, 1995) and long-term depression (Chen et al., 1995) in the hippocampus. Thus, one way in which activity at D1/D5 receptors could act to bring about long-lasting changes in intracellular events that control DA synthesis and availability in striatal terminal regions (Robinson and Becker, 1986; Vezina, 1993; Vezina, 1996) is through learning-type modifications either within afferents to the DA cells or between the afferents and the somatodendritic region of the DA cells within the substantia nigra (Kalivas and Stewart, 1991; Kalivas, 1995).

FOOTNOTES

Received Dec. 23, 1996; revised Feb. 18, 1997; accepted Feb. 21, 1997.

  

This research was funded by grants to J.S. from the Medical Research Council of Canada and from the Fonds pour la Formation de Chercheurs et l'Aide à la Recherche (Québec).

Correspondence should be addressed to Jane Stewart, Center for Studies in Behavioral Neurobiology, Department of Psychology, Concordia University, 1455 de Maisonneuve Boulevard West, Montreal, Quebec, Canada H3G 1M8.


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