Abstract
EMG activities of the jaw closers and the jaw opener were recorded during licking of water and varying taste solutions in rats. The rats showed a continuous and rhythmic licking pattern (about 7 Hz) when they took water, 0.5 M sucrose and 0.1 M NaCl. A clear reciprocal relation of the jaw closers and opener was recognized during licking. The digastric muscle (jaw opener) started to work about 60 msec before the contact of the tongue with the liquid and ceased its activity at the moment of the contact, while the temporalis and masseter muscles (jaw closers) started to work about 50 msec after the contact. On the other hand, the rats rejected 1 M NaCl and 5 × 10-4 M quinine-HCl, and stopped licking within a few seconds. However, EMG activities of the masticatory muscles continued more than 20 sec after cessation of licking. A characteristic jaw opening (gaping) was observed after licking quinine or after an oral infusion of 0.3 M CaCl2. To presentations of 0.03 M HCl and 0.3 M NaCl, the licking pattern was the intermediate between the above-mentioned licking patterns shown by acceptable and rejective taste stimuli, i.e., the rats tended to show intermittent lickings to these HCl and NaCl solutions and the interlick interval varied greatly. The present results suggested that licking patterns and EMG activities of the masticatory muscles were characterized by the hedonic aspect or palatability of taste (acceptance-rejection dichotomy) rather than the taste quality (whether a taste is sugar, salt, acid, etc.).
| Original language | English |
|---|---|
| Pages (from-to) | 905-913 |
| Number of pages | 9 |
| Journal | Physiology and Behavior |
| Volume | 29 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1982 |
| Externally published | Yes |
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Keywords
- EMG
- Licking
- Masticatory muscles
- Taste
ASJC Scopus subject areas
- Physiology (medical)
- Behavioral Neuroscience
Cite this
EMG activities of masticatory muscles during licking in rats. / Yamamoto, Takashi; Matsuo, Ryuji; Fujiwara, Toshiko; Kawamura, Yojiro.
In: Physiology and Behavior, Vol. 29, No. 5, 1982, p. 905-913.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - EMG activities of masticatory muscles during licking in rats
AU - Yamamoto, Takashi
AU - Matsuo, Ryuji
AU - Fujiwara, Toshiko
AU - Kawamura, Yojiro
PY - 1982
Y1 - 1982
N2 - EMG activities of the jaw closers and the jaw opener were recorded during licking of water and varying taste solutions in rats. The rats showed a continuous and rhythmic licking pattern (about 7 Hz) when they took water, 0.5 M sucrose and 0.1 M NaCl. A clear reciprocal relation of the jaw closers and opener was recognized during licking. The digastric muscle (jaw opener) started to work about 60 msec before the contact of the tongue with the liquid and ceased its activity at the moment of the contact, while the temporalis and masseter muscles (jaw closers) started to work about 50 msec after the contact. On the other hand, the rats rejected 1 M NaCl and 5 × 10-4 M quinine-HCl, and stopped licking within a few seconds. However, EMG activities of the masticatory muscles continued more than 20 sec after cessation of licking. A characteristic jaw opening (gaping) was observed after licking quinine or after an oral infusion of 0.3 M CaCl2. To presentations of 0.03 M HCl and 0.3 M NaCl, the licking pattern was the intermediate between the above-mentioned licking patterns shown by acceptable and rejective taste stimuli, i.e., the rats tended to show intermittent lickings to these HCl and NaCl solutions and the interlick interval varied greatly. The present results suggested that licking patterns and EMG activities of the masticatory muscles were characterized by the hedonic aspect or palatability of taste (acceptance-rejection dichotomy) rather than the taste quality (whether a taste is sugar, salt, acid, etc.).
AB - EMG activities of the jaw closers and the jaw opener were recorded during licking of water and varying taste solutions in rats. The rats showed a continuous and rhythmic licking pattern (about 7 Hz) when they took water, 0.5 M sucrose and 0.1 M NaCl. A clear reciprocal relation of the jaw closers and opener was recognized during licking. The digastric muscle (jaw opener) started to work about 60 msec before the contact of the tongue with the liquid and ceased its activity at the moment of the contact, while the temporalis and masseter muscles (jaw closers) started to work about 50 msec after the contact. On the other hand, the rats rejected 1 M NaCl and 5 × 10-4 M quinine-HCl, and stopped licking within a few seconds. However, EMG activities of the masticatory muscles continued more than 20 sec after cessation of licking. A characteristic jaw opening (gaping) was observed after licking quinine or after an oral infusion of 0.3 M CaCl2. To presentations of 0.03 M HCl and 0.3 M NaCl, the licking pattern was the intermediate between the above-mentioned licking patterns shown by acceptable and rejective taste stimuli, i.e., the rats tended to show intermittent lickings to these HCl and NaCl solutions and the interlick interval varied greatly. The present results suggested that licking patterns and EMG activities of the masticatory muscles were characterized by the hedonic aspect or palatability of taste (acceptance-rejection dichotomy) rather than the taste quality (whether a taste is sugar, salt, acid, etc.).
KW - EMG
KW - Licking
KW - Masticatory muscles
KW - Taste
UR - http://www.scopus.com/inward/record.url?scp=0020446580&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0020446580&partnerID=8YFLogxK
U2 - 10.1016/0031-9384(82)90342-0
DO - 10.1016/0031-9384(82)90342-0
M3 - Article
C2 - 7156228
AN - SCOPUS:0020446580
VL - 29
SP - 905
EP - 913
JO - Physiology and Behavior
JF - Physiology and Behavior
SN - 0031-9384
IS - 5
ER -