n = 6 males
no trick
subjects apprised of drink type just before scan
is this different from Urban?
Is it different from Yoder?
how consistent is the “typical alcohol curve?”
what can be done to control it?
compare to Urban who got 12% change in BP in VS in 11 males.
n = 11 males; 10 females, analyzed separately
design issues:
no baseline – what happens if DA goes DOWN with placebo – is this still a valid comparison? a valid interpretation?
how do we know they got to steady state? is that necessary for their analysis?
why might DA go down with ‘placebo’
drink is 3 drinks-worth; forced drinking in 5-10 minutes? aversive?
differences are masked by vodka smell – will this induce negative reward-prediction error?
DA release related to frequency of max-drinking day? what does this mean?
do men differ from women because they are demographically different?
blinded?
expectations?
order effects?
(need sham scan)
cue (visual and OLFACTORY)
n = 8 males
bolus study
order effects? why? can it be avoided?
not self admin
is iv alcohol like drinking? look at behavioral self reports
Conclusions- I• Data conform to
observations of dopaminergic function in reward prediction.
• Dopamine’s coding of expectation may be relevant to alcoholism (see Lapish, Seaman, & Chandler, 2006. ACER).
No CS
CS
CS
unexpectedreward
predictedreward
absence of predicted reward
from
: S
chul
tz,
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ence
.
is the Yoder design really analogous to the Schulz experiment in monkeys? Don’t we need prior conditioning? What is the author’s answer to this?**
would like to know if anyone’s BP went wrong way (DA down) in Urban study – if so, it would agree with Yoder.
BAC in Boileau study did not correlate with BP
(agrees with Urban -- claimed it didn’t correlate with)
**Yoder et al: probably claim that prior drinking exposure IS conditioning. So when they see and hear alcohol cues – they expect to get reward.
Consider figure 3. Subjects said: “It was clear I was about to get drunk.”
Yoder: SHAS and AUDIT scores NOT correlated with BP
Boileau: SHAS scores did not correlate with BP
impulsiveness predicted BP change in VS
