On the schedule-induction of drinking

164

50 seconds).In a second phase of the experiment, the same birds were trained to peck a key and put on the Differential Reinforcement of Low Rates schedules (DRL 5,10,15 and 20 seconds). At each of these schedule values, runs of at least 15 sessions were performed. Sessions lasted 25 reinforce1

ments or

hour,whicheveroccured first. The data were computed over the

5 last sessions of each run. The well peak&frequency distributions of perching durations testify to a precise temporal control (modal and median perching durations were close to schedule requirements up to the 50 seconds value) whereas keypeck Inter-Response-Timedistributions evidenced only poor temporal control (modal and median IRT values situated in the lower IRT range).Efficiencies(percentageof reinforced responses) remained higher for the perching duration response. These results are comparable to those described in the above mentioned experiment. The difference between the two responses may be related to the status of the perching behaviour in the natural repertoire (linked to rest and sleep) as opposed to that of the keypecking behaviour (linked to food seeking and eating,with a particu"rhythm" counteracting the DRL pacing requirement).Methodological larities of the response duration reinforcement schedule, as opposed to DRL, must also be taken into account. Lejeune H. and EI.Richel;e,Behav. Anal. I,ett.,198?,2, 49-57.

ON THE

J.D.

SCHEDULE-INDUCTION

KEEHN

Department M3J

2R7,

The poral Falk

of Psychology,

schedule

control

distribution (1) reported

terminal

Colleqe,

excessive After

York

University,

Whatever

during induces

but periodic

Like

Downsview,

on

occurs ---

feeding.

by

Ontario

such

is not

on the

reinforcement rats

acquired

(3) I doubt

and propose

of feeding,

drinking

constraints

exclusively

during

(2) differentiated drinking

Roper

activities,

interruptions when

drinking

schedule-induced

of

almost

for securing

and Simmelhag

activity. class

focused

specified

non-specified

Staddon such

interim

a general

fit pacifier

of behaviour

of an operant

activities,

prototypical presents

Atkinson

Canada

reinforcement.

1.

OF DRINKING*

that

that

intermittent

interim the

such

tem-

until

from

status drinking

it serves

of

a re-

as a speci-

that:

a schedule

of

reinforcement

165

Six rats were trained were scheduled in blocks

first on continuous

of _ n pellets

60), where "was

the 200 pellets

averaged

lets and concurrent creased

eating

reinforcement

(baseline,

sessions

9.2 ml.

When n was 50 and 25, eating

fell below

intervals

(ext

5 (40 blocks) sessions

of 39.5 min, in which time water

intakes were sliqhtly intakes

crf 200) and then

In the baseline

in an average

water

up to 200 pellets

10 (20 blocks),

each.

consumed

time and water

intakes per session

in which

by 60-set extinction

25 (8 blocks),

for 5 successive

were

sessions

(crf n) separated

50 (4 blocks),

and 2 (100 blocks)

consumption

in 2 hour-long

lower.

increased,

times per 200 pel-

Thereafter

as -n de-

until when _ n was 2, pellet

200 and water intakes quadrupled

to an average

of 36.5 ml. 2.

Whatever

is induced by constraining

responsible

for conditioned

Four rats were trained

tus in which

in the original

to a conditioned

and elevation

apparatus

of drinking

rat never barpressed barpressing

schedule

3-min stimulus

on a fixed-interval

until polydipsic suppression

presentations

and elevation

all rats exhibited in the absence

of drinking

showed

are

adjunctive

1.

Falk, J.L. schedule.

2.

Roper, T.J.

Staddon,

Psychological *NOTE: mental

Animal

induction?

& Simelhag,

of its implications Review,

1971, 2,

Abstract

of a paper

Analysis

of Behaviour,

appara-

In tests

of barpressing

In 3-min US periods,

concurrent

suppression

(a) that adjunctive is low,

one

of

declines,

in normal

drinking

oc-

(b) when drinking and

in stress-produced

of polydipsia

1961, 133,

suppression

(c) adjunctive

ACTH level.

rats by an intermittent

food

195-196.

What is meant by the term "Schedule-induced",

J.E.R.,

examination

drinking

with reduction

Production Science,

is schedule 3.

eating,

in a different

They

in the third minute of the CS.

these proposals

itself

is correlated

is

(mix crf 1

occurred.

in footshock.

of the CS.

of food reinforcement

constrains

procedure

partial

curs when the probability

drinking

is whatever

60 set

drinking

terminated

but the three others

Other data supporting

procedures

suppression.

to barpress

ext 60) food reinforcement were then exposed

(scheduling)

Learning V.L.

and Behaviour,

The "superstition"

for the principles

and how general

1981, 2, 433-440. experiment:

A re-

of adaptive behaviour.

3-43.

given at the First European held in Liege, Belgium,

Meeting

on the Experi-

in kJuly 1983.