高・低情動反応性系ラットの行動比較: 2 オープンフィールド行動と貯蔵行動

中村 則雄; 阿部 勲; 藤田 統

doi:10.4992/jjpsy.49.61

BEHAVIORAL DIFFERENCES IN THE RAT SELECTED FOR HIGH AND LOW EMOTIONAL REACTIVITY (2)

OPEN-FIELD BEHAVIOR AND HOARDING BEHAVIOR

NORIO NAKAMURA, ISAO ABE, OSAMU FUJITA

Author information

JOURNAL FREE ACCESS

1978 Volume 49 Issue 2 Pages 61-69

DOI https://doi.org/10.4992/jjpsy.49.61

Details

Published: July 20, 1978 Received: March 31, 1977 Available on J-STAGE: July 16, 2010 Accepted: - Advance online publication: - Revised: -
Correction information
Date of correction: July 16, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : The purpose of this study was to investigate behavioral differences between rats of high and low emotional reactivity lines by using open-field and hoarding tests. These two lines had been selected since 1972, in terms of ambulation in the Runway Test.
Subjects were 22 male albino rats (11 in each line) of the 6th generation. In the openfield (90×90×30cm, 25 squares), each subject was placed into the center of the field and was observed during 5min for three consecutive days under bright illumination (2, 000lx) and recorded the following seven measures every min; (a) ambulation, (b) defecation, (c) rearing at wall, (d) rearing elsewhere, (e) face washing, (g) scratching. Then daily hoarding trials (30min) were run under 23hr food-deprivation and additional five trials were given under satiation. In each trial, the number of food pellets which the subject carried into the cage was recorded.
The results of the open-field test were as follows: (1) Low emotional reactivity line (L line) showed significantly more ambulation (Fig. 1), rearing (Fig. 3), and scratching than high emotional reactivity line (H line). (2) There were no differences between two lines in defecation (Fig. 2), face washing (Fig. 4), and grooming. (3) At the beginning of the first trial, about a half of the H line rats showed backward movement from the center to the wall or corner of the open-field, but any rat in the L line did not show such a behavior.
In the hoarding test, the following findings were obtained under food-deprivation. (1) Two lines did not show any differences in the number of trials required untill the subject started to hoard constantly. (2) The L line tended to hoard more pellets during seven constant hoarding trials (Fig. 5). Under satiation, the subjects in each line hoarded more than under deprivation and the L line hoarded more than the H line (Fig. 6).
In summary, the H line rats did not move about, but stayed still in the corner of the open-field. In addition, it would be important to note that these line rats also showed backward movement, which might have a close relationship with emotional reactivity. In the hoarding test, the L line rats seemed to hoard more food than the H line rats.
Right : Behavioral differences between high (H) and low (L) emotional reactivity lines based on the ambulation in the Runway Test were investigated by using open-field and hoarding tests. Subjects were 22 male albino rats of the 6th generation. Each subject was placed in the open field during 5 min for 3 consecutive days. Then, daily hoarding trials (30 min) were run .under 23 hr food-deprivation and additional five trials were given under satiation. In the open-field test, L-line rats showed higher measures of ambulation, rearing, and scratching than H-line, but defecation, face washing, and grooming scores were not different between the two lines. In the hoarding test L-line rats tended to hoard more pellets under food-deprivation and hoarded significantly more under satiation than H-line rats.

Abstract

Behavioral differences between high (H) and low (L) emotional reactivity lines based on the ambulation in the Runway Test were investigated by using open-field and hoarding tests. Subjects were 22 male albino rats of the 6th generation. Each subject was placed in the open field during 5 min for 3 consecutive days. Then, daily hoarding trials (30 min) were run .under 23 hr food-deprivation and additional five trials were given under satiation. In the open-field test, L-line rats showed higher measures of ambulation, rearing, and scratching than H-line, but defecation, face washing, and grooming scores were not different between the two lines. In the hoarding test L-line rats tended to hoard more pellets under food-deprivation and hoarded significantly more under satiation than H-line rats.

Corresponding author

Correction information

Register with J-STAGE for free!