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43(no-cue/no-outcome) frequency and duration. Transfer cue ratings were unchanged. Experiment2: Identical contingency training followed by summation tests for conditioned inhibition found similar sensitivity to D-trial frequency and duration. Bivalent Likert scales mimic approach-avoidance-like measures of conditioned excitation and inhibition.POSTER 13PERCEIVED ACADEMIC STRESS AMONG TRADITIONAL UNDERGRADUATES: THE ROLE OF ON-CAMPUS LIVINGBLISS WESTON (YALE UNIVERSITY), NEDA MOINOLMOLKI (ALBERTUS MAGNUS COLLEGE), SHAMIR LEE-MITCHELL (ALBERTUS MAGNUS COLLEGE), KRYSTAL LUNA (ALBERTUS MAGNUS COLLEGE), BRIANNA MARTIN (ALBERTUS MAGNUS COLLEGE), BRIANNA MORALES (ALBERTUS MAGNUS COLLEGE), SAMANTHA OTRANTO (ALBERTUS MAGNUS COLLEGE) This study explored the impact of on-campus versus off-campus employment and residency on academic stress in traditional undergraduate students. Although results did not show a difference in stress levels between students employed on or off-campus, those residing on campus had statistically significantly lower levels of academic stress related to self-perception (M = 14.67, SD = 2.85) compared to commuters (M = 17.33, SD = 3.08; t(19) = -1.90, p = .04).POSTER 14PERCEPTUAL LEARNING IN RATS GIVEN INTERMIXED VS BLOCKED PREEXPOSURE TO AUDITORY STIMULISASHA JAMAL (BROOKLYN COLLEGE CUNY), NORMAN TU (THE GRADUATE CENTER, CITY UNIVERSITY OF NEW YORK), ANDREW DELAMATER (BROOKLYN COLLEGE CITY UNIVERSITY OF NEW YORK) We investigated whether rats are better at discriminating between similar stimuli that had been pre-exposed in an intermixed vs blocked procedure. This effect was observed with a more, but not less, extensive amount of preexposure. Oddly, with few preexposures rats exposed to stimuli in blocks acquired conditioned responding more rapidly. These data present a puzzling picture of the role of pre-exposure in perceptual learning.POSTER 15PRE-CRASTINATION: THE POTENTIAL ROLE OF TRAIT IMPULSIVITY AND PHYSICAL EFFORTSIRUS MINOVI (SAINT LAWRENCE UNIVERSITY), JASON BERGERON (SAINT LAWRENCE UNIVERSITY), HALEY MORLAND (SAINT LAWRENCE UNIVERSITY), LAKEN A. MOONEY (SAINT LAWRENCE UNIVERSITY), AYESHA KHATUN (SAINT LAWRENCE UNIVERSITY), ADAM E. FOX (SAINT LAWRENCE UNIVERSITY)Pre-crastination is the tendency to complete or begin a behavior unnecessarily early and at some cost. We found no relationship between pre-crastination and trait-level impulsivity in Experiment 1. In Experiment 2, we found that as we systematically increased the absolute cost to pre-crastinate, participants ceased to pre-crastinate and moved towards the optimal choice. This suggests that as the options became more discriminable, the participants procrastinated less, and eventually not at all.POSTER 16TIME PERCEPTION IN A FEMALE COMORBID ADHD AND PTSD RODENT MODELMADELINE MUSTERAIT (SAINT LAWRENCE UNIVERSITY), SAJIDA JAN (SAINT LAWRENCE UNIVERSITY), SIRUS MINOVI (SAINT LAWRENCE UNIVERSITY), ADAM E. FOX (SAINT LAWRENCE UNIVERSITY) Those with comorbid ADHD and PTSD may experience altered time perception. Twenty-four female rats, twelve SHR/NCrl modeling ADHD and twelve Wistar, completed a temporal bisection task in a pre/posttest design. Half of each group underwent predator odor exposure to model PTSD. Odor exposure appeared to increase timing for SHRs, but SHRs did not display significantly faster time perception, suggesting that female SHR/NCrl rats may not be an acceptable model of time perception in ADHD.POSTER 17ROBUST RENEWAL AFTER EXTINCTION OF REMOTELY ACQUIRED PAVLOVIAN CONDITIONINGJOSEPH CHARLES (UNIVERSITY OF VERMONT), SAMANTHA MORIARTY (UNIVERSITY OF VERMONT), NEIL WINTERBAUER (UNIVERSITY OF VERMONT), EMILY COOPER (UNIVERSITY OF CALIFORNIA BERKELEY), TRAVIS TODD (UNIVERSITY OF VERMONT) The timing of extinction relative to original Pavlovian fear conditioning has impacts on both behavior and the neural substrates. Here we investigated extinction and renewal, after extensive conditioning-to-extinction intervals. Robust renewal was observed when extinction occurred recently (1-day) or remotely (28-days) after conditioning. This was true when renewal was assessed in the original conditioning context (ABA 43Friday, March 7