|Reference code: ||PT/FB/BL-2000-017.07|
|Location: ||Arquivo PCA - Pasta 6/2000|
|Differences in dream structure between blind and sighted subjects|
|Publication year: ||2001|
It is currently assumed that congenital blind have a different dream structure than sighted subjects, namely that they do not dream with images.
We evaluated 10 congenital blind (age: 28.2±5.2; 5 males and 5 females) and a control group of 9 sighted subjects (28.2±5.5; 4 males and 5 females), matched for age, sex and education, without medical or psychiatric diseases, and with regular sleep schedules, in order to assess the differences between the dream structure.
The dream reports were collected at the volunteers’ home during two consecutive nights. The subjects were awaken four times each night, every 90 minutes, through a programable alarm. After being awakened the volunteer recorded to a voice-activated tape recorder everything he/she was thinking prior to the awakening.
Grammatical and content analysis were performed on the dream reports. The first consisted on the following classes: Total Number of Words (TW), Percentage of Verbs (PV), Percentage of Adjectives (PA) and Percentage of Nouns (PN). The content analysis was performed based on the Hall & Van the Castle criteria using two of the categories: Activities and Emotions, and the corresponding classes: Physical (P), Movement (M), Change in Location (L), Verbal (V), Expressive Communication (E), Visual (S), Auditive (A), Thought (T), Fury (FU), Apprehension (AP), Happiness (HA), Sadness (SA) and Confusion (CO).
Each recording was analysed independently by two experimenters, unaware of the volunteer’s category. For each analysis the following parameters were calculated: Global Oneiric Activity Index (GAI=(P+M+L+V+E+S+A+T)/TW), Visual Activity Index (VAI=S/TW), Thought Activity Index (TAI=T/TW), Muscular Activity Index (MAI=(P+M)/TW), and Global Oneiric Emotivity Index (GEI=(FU+AP+HA+SA+CO)/TW). The final value was the mean of the two independent scores.
The 2 groups were compared through the Mann-Whitney’s Test. Regarding the grammatical analysis no significant differences were found between the groups. For the content analysis the only significant difference is for the visual class (S) (U=16.5, p<0.05), but this difference disappears when we compute the VAI, i.e., the Visual Activation Index presents no difference between the groups.
These results suggest that congenital blind and sighted subjects dream structures are similar.
|Accessibility: ||Document does not exist in file|
|Secondary author(s): |
|Paiva, T., Pessoa, L., Mestre, T. , Marques, R. |
|Document type: |
|Number of reproductions: |
|Bertolo, H., Paiva, T., Pessoa, L., Mestre, T., & Marques, R. (2001). Differences in dream structure between blind and sighted subjects. In R. A. Velluti (Ed.), Actas de Fisiologia (Vol.7, p. 145). Monteviedo, Uruguay: Facultad de Medicina, Universidad de la República. |
|Indexed document: ||No|
|Keywords: ||Psychophysiology / Sleep and dreams / Congenital blindness / Sighted|
Differences in dream structure between blind and sighted subjects